[From the U.S. Government Printing Office, www.gpo.gov]







                                                                                   Project #94-4,-6












































            T67
            P57
            1995





























































































                  m CIVIL



                m MARINE
              m PLANNING                                                         A
           1114




            m STRUCTURAL                                                                I@E@l
       m TRANSPORTATION                                                  Appledore Engineering, Inc.














                            PISCATAQUA RIVERWALK
                                  FEASIBILITY STUDY/


                                                    June,1995




                                                  Prepared For:

                                                City of Portsmouth
                                                    PO Box 628
                                                 1 Junkins Avenue
                                        Portsmouth, New Hampshire 03 801




                                                   Prepared By:

                                            Appledore Engineering, Inc.
                                              600 State Street, Suite D
                     to                 Portsmouth, New Hmpshire 03 801             MH Coastal Pro
                                                                                               gram

              This report was funded in part by a grant from the Office of State Planning, New Hampshire
                Coastal Program, as authorized by the National Oceanic and Atmospheric Administration
            (784-025.DOC)           (NOAA), Grant Award Number N470ZO237.
                   .00




                                                                                           'AE1
                                                                                             Appledore Engineering, Inc.












                                       TABLE OF CONTENTS





              L     INTRODUCTION


                    1.1   Scope and Purpose
                    1.2   Project Background


              H.    EXISTING CONDITIONS


                    2.1   Topographic and As-Built Surveys
                    2.2   Bathymetric Survey
                    2.3   Waterfront Inspections


              M.    INITIAL ENGE'4EERING STUDIES


                    3.0   General Discussions
                    3.1   Subsurface
                    3.2   Wind
                    3.3   Currents
                    3.4   Waves
                    3.5   Ice
                    3.6   Tide Levels
                    3.7   Workshops and Public Meetings

              1V.   ALTERNATIVE ANALYSIS


              V.    REGULATORY AGENCY PERNUTTING


              VI.   RECONEVIENDATIONS



















                                                                               AE1
                                                                               Appledore Engineering, Inc-










                  1.      INTRODUCTION


                          1.1     Scope and Purpose

                                  The City of Portsmouth proposes to construct a downtown waterfront
                                  walkway along the Piscataqua River, adjacent to Bow Street in
                                  Portsmouth, New Hampshire (See Vicinity map). The development area
                                  consists of approximately 800 feet of waterfront bounded by; the cities
                                  waterfront deck on Ceres Street to the west, the Harbour Place public
                                  wharves to the east, the existing buildings along Bow Street to the south,
                                  and the U.S. Army Corps of Engineers Federal Navigation Channel to the
                                  north (see Existing Conditions Plan).

                                  The basic purposes of the proposed facility are:

                                  1.     Link the existing public waterfront wharves at Harbour Place with
                                         the City, public waterfront wharf on Ceres Street, and

                                  2.     Revitalize the City's historic downtown waterfront.

                                  The proposed facility studied herein centers around providing public
                                  access to the waterfront within the study area. This study has been
                                  undertaken in order to assess the feasibility and viability of such an
                                  endeavor and to recommend an optimum means of accomplishing the
                                  projects basic purposes.

                          1.2     Project Background

                                  The proposed Piscataqua Riverwalk project is focused on reconstructing
                                  the once-bustling waterfront along Bow Street in Portsmouth, New
                                  Hampshire. The Riverwalk will not only serve as a waterfront
                                  promenade, but also as an education tour highlighting its noteworthy past.
                                  The Bow Street wharves were a significant commercial center during the
                                  eighteenth and nineteenth centuries, and the area itself was part of the
                                  original Strawbery Banke, where the earliest Portsmouth settlers landed
                                  and built their homes in 163 1. The old wharf system, which occupied all
                                  of the Bow Street shoreline, rotted away or "fell in7 sometime in the
                                  1920's after 220 years of serving the merchants of Portsmouth.









                  Piscataqua Riverwalk                        1 of 2                         Introduction
                  Feasibility Study                                                                     AE1
                                                                                                        Appledore Engineering. Inc.









              Ligh   P i I in 9N,
                    -0
                   L'
                                                                                       m


                                                                                                            220 000 FEET
                                                                                                            IN. H.)
                                                   .0                                                       4773
                                             Cem.
           12  1 lbo ii?

                                       onveW                                                                  z
                                                                                                            Q)




                         er
                        r            ja  Ii e                  t1a
                                                                        X%                                    0
                                                                        @xlb                                  Q.
                                                                                                            0



                                   S
                                                                                   0
                                                                                   S
                                                                            @m ns\                  Ce
                                          -;vate
                                                                                       ai
                     I  Pk                                                             Bridge
                                                                                                                0
                                                                                   NABS I                       Q.
                                                                                          -.-55r

                                             I
                                                                                      iling
                                                              T1.                    1@   %   .:
                                                                                          %
                                                                                                              S1 TE
                                                                                               Memorial
                                      0                                                                       4771
                                         St C

                             4



                                 %







                                                                                      Pk
                                                                                                              U

                                                                                   R     Pat


              INTER HANGE



                                   "@/Meadd

                                                                        42







                                 CH
                                Aft 0
                                P14ming                  VICINITY MAP                     PISCATAQUA RIVERRALK
                                struch"'d
          AIFI                                                                              FEASIBILITY STUDY
          Appledore Engineering, Inc.
          600 State Street, Suite D
          Portsmouth, NH 03801    (603)433-8818   0      1, 2    Z183           4,167     CITY OF PORTSMOUTH
          REFERENCE:                                                                           P.O. BOX 628
          USGS QUAD PORTSMOUTH. NH-ME                                                       1 JUNKINS AVENUE
                       1: 24,000                               IN FEET                  PORTSMOUTH. NH 03801
          DATE: JULY   1995                                                                                   FIGURE I
          (784\AC)                        THIS FIGURE WAS FUNDED IN PART BY A GRANT FROM THE OFFICE
                                            OF STATE PLANNING, NEW HAMPSHIRE COASTAL PROGRAM, AS
                                             AUTHORIZED BY THE NATIONAL OCEANIC AND ATMOSPHERIC
                                              AOMINISIT@A-MON (NOAA). GRANT AWARD N.. NA47OZO237.
















                                                                                                                                                                                                                                                                                                                                                                                                     'MIS RGURE
                                                                                                                                                                                                                                                                                                                                                                                                          OF STAM
                                                                                                                                                                                                                                                                                                                                                                                                            ALITH04"
                                                                                                                                                                                                                                                                                                                                                                                                             AMIN





                                                                                                                   PISCATAQUA RIVER
                                                                                                              PORTSMOUTH HARBOR

                                                                                                                               FLOOD 08



                                                                                                                                                                                                                                                                          so



                                                                                                                                                                                                                                                                                             ------------



                                                                                                                                                                                                                                                                    oe


                                                                                                                               so
                                                                                                                                               -----------
                                                                                                                               J.-
                                                                                                                                                                                                                                                                                                                                                                                   to


                                                                                                                                       ----------



                                                                                                                                                                                                                                                                                                         r


                                                                                                                                                                                                                                                                    LOT
                                                                                                                                                                                                                                                                    go
                                                                                                                                                                                                                      ILDF
                                                                7.
                                                                                                                                                                                                                                                              1ST rY- 2W
                                                                                     20--                                                                                                                                                                                                                                                                  LOT
                                                                                                                                                                                                                       IST F.F. Ir
                                                                                                                                                                    LOT                                                                                                                                                                                    57
                                                                                                                                                                     53
                                                                                                                                                        LOT                                                                                                         STREET
                                                                                                                        LOT                              52
                                                                                                                                              LOT                                                                                                                                                                                                                                                        0
                                                                                                                                         IST rr. is                                              90
                                                                                                                                      T

                                                                                                                                                                                                                                                                                                                                                                                              LOT
                                                                                                                   OT
                                                                                                                   49
                                                                                                            srr Fry. I.Y                                                                                                                                                          48.3
                                                                                                   LOT
                                                                                                    48
                                                                                                                                                                                                                                                                        43.7                                           .0


                                                                                                                                                                                                                                                                                                                                                                                        30.
                                                                                                                                                                                                                                                                                                                                                                                              0


                                        4-r-3
                                                                                                                        1&3                                                                                                    412                    -4-


                                                                                                                                                         1&4
                                                                                                                                                       +                                                                            -40                                                                 .0

                                                                       0                                                                                                                                                                                                                                                                                               30.4
                                                                                                                                                                                                     27.5                                                                                                                                                         +
                                                                                                                                                                                                  +
                                                                                                                                                                                                                                                                                                                                                                                    0

                                                                                                                                                                                                                                                                                                                                                                                       0
                                                                                      N



                                                                                                                                                   2 .9
                                                                                                                                                 +

                                                                                                                        MLLW          1929                                                                                                                          LEGEND:                                                                   ASSESSOR*S LINE          ................
                                TIDE DATA                                                                               DATUM         HM                                                                                                                            INDEX CONTOUR        ..................                                   TREELINE     .............--*
                                ESTIMATED 100-YEAR FLOOD                     ELEVATION (STILLWATER)                     13.3          8.9,                                                                                                                          INTERMEDIATE CONTOUR                                                      FENCE    ..................................
                                                                                                                                                                                                                                                                    WATERLINE     .......................                                     RETAINING WALL           ..................
                                HIGHEST OBSERVED WATER LEVEL (2/7/78)                                                   12.78         8.39'                                                                                                                         UTILITY POLE      ......................                                  STRUCTURE       ..........................
                                                                                                                                                                                                                                                                    LIGHT POLE      .........................                                 RAILROAD     .............................
                                                                                                                                                                                                                                                                                                                                              GRAVEL ROAD       ...................... .
                                                                                                                        10.5ï¿½         6.0ï¿½                                                                                                                          MANHOLE      ............................          0                      PAVED ROAD      ..................
                                ESTIMATED ANNUAL HIGH WATER                                                                                                                                                                                                         CATCH BASIN        .....................                                  POOL     ....................I  :*"*,
                                MEAN HIGH WATER (1960-1978 TIDAL EPOCH)                                                 8.46          4.07'                                                                                                                         WATERVALVE        ......................                                  CONTROL POINTS           ............
                                                                                                                                                                                                                                                                                                                                                           /4








































































                                NATIONAL GEODETIC VERTICAL DATUM - 1929                                                 4.39          0
                                MEAN LOW WATER (1960 - 1978 TIDAL EPOCH)                                                0.33          -4.06'
                                MEAN LOWER LOW WATER (1.960-1978 TIDAL EPOCH)                                           0.0           -4.39'                                                                                                                                                  200     0               4.0             so               120             160 FEET
                                ESTIMATED ANNUAL LOW WATER                                                              -1.8ï¿½         -8.19'
                             I LOWESt OBSERVED WATER LEVEL (12/10/77)                                                   -3.00         -7.39'









                                     Historical research of the old Bow Street wharves is ongoing, but has
                                     already revealed its significant role as an import hub. There were
                                     individual wharves at least as early as 1699, and it is believed that the
                                     complete wharf system came to be in the late-eighteenth century, during
                                     the commerce and shipbuilding boom of the Piscataqua region from 1783
                                     to 1812. Trade was heavy with the West Indies during this period, the
                                     chief imports being rum, sugar, coffee, and molasses. One of the more
                                     active merchant families on Bow Street at the time, the Havens, imported
                                     506,000 ponds of sugar, 26,000 gallons of rum, and 597,000 pounds of
                                     coffee in 1806 alone. During the War of 1812, little or no shipping came
                                     in or out of Portsmouth at all, and the Bow Street merchants were among
                                     those who contributed money and sailors from their own vessels to the
                                     privateering cause. After the war, the region's economy recovered and
                                     prospered, resuscitating the Bow Street import market. Influence on West
                                     Indian trade was still strong, but merchants also began bringing in
                                     European and Oriental goods. On any one of the wharves in the 1820's,
                                     one would be likely to find 70-ton piles of Sweede's iron, 2,000 gallons of
                                     spring-pressed sperm whale oil, Calcutta sugar, cordage, tar, paint,
                                     carpeting, or men's silk hats, just to name a few! Although it never
                                     regained the fervor pitch of the pre- 18 12 period, activity at the wharves
                                     was consistent through most of the nineteenth-century until it faded away
                                     around 1900. Time and the swift current of the Piscataqua erased some 60
                                     years ago the reminder of what was once an active and vital waterfront.

                                     When the Piscataqua Riverwalk is complete, it will be a twentieth-century
                                     interpretation of the old wharves for the public to enjoy and learn about
                                     the vivid past that's underfoot.

                                     Current landibuilding uses in this area of the City is a mixture of
                                     residential, commercial, industrial and municipal uses (see current
                                     land/building uses plan).
















                   Piscataqua Riverwalk                             2 of 2                              Introduction
                   Feasibility Study
                                                                                                                   AW
                                                                                                                   Appledore Engineering, Inc.











                                                         Rl, - w-,




                                                                                                  IWO.'






                                                                               q
                                      BOW         STREET             WATERFRONT                     by DAVIS               BROTHERS.                 ca.1886
    >                                                    COURTESY OF PORTSMOUTH                                           ATHENEAUM




                                                                                                            THIS FIGURE WAS FUNDED IN PART BY A GRANT FROM THE OFFICE
                                                                                                               OF STATE PLANNING. NEW HAMPSHIRE COASTAL PROGRAM. AS
                                                                                                                AUTHORIZED BY THE NATIONAL OCEANIC AND ATMOSPHERIC
                                                                                                                 ADMINISTRATION (NOAA). GRANT AWARD No. NA47OZO237.




















                                                PISCATAQUA RIVER
                                             PORTSMOUTH HARBOR                                                         STUDY AREA
                                                 -FLOOD EW-














                                                                                                                                    LOT
























                                                9&



                                                                                                                                                                                                                                                                      t;


                          RESVENTIAL/
                          COMMEWAL MIX                         MUNCIPAL                           MLIMaPAL
                                                                                                  ACCESS PIERS/*WWS


                          COMMERCIAL                           INDUSTMAL                          COMMERCIAL
                                                                                                  ACCESS PIEFtS/WHARWS


                          RESMUAL                              pumc                               PUBLIC
                                                               ACCESS RIGHT-OF-WAY                ACCESS PIERS/*MWS
                                                                                                                                                                                       CURRENT LANDIBUILDING USES
                                                                                                                                                                                                                                                                   of



                                    -11 Fl-                 IN PART INY A GRAMT FROM      OFIVE
                                       OF STAr
                                              @ PLA"MING'  NEW HAMPSHM 0OASTAL PROGRAM. AS
                                        ALITHORIZIED BY 7W NAMONAL. OCrAW AP40 ATMOSPHERIC
                                         ADMWS.,RAnGM ('40M."  GRAHT PIVARRO V- 14^47OZOM.










                 H.      EXISTING CONDITIONS


                         2.1     Topographic and As-Buflt Surveys

                                 The City of Portsmouth Department of Public Works - Engineering
                                 Division, completed a detailed topographic and As-Built survey of the
                                 cities waterfront area, by photogrammetric methods from aerial
                                 photographs taken on May 3,1994. Digital data from this survey was
                                 used as the basis of this projects Existing Conditions Plan. This aerial
                                 survey data was supplemented with the following:

                                 e Tax assessors maps for boundary lines
                                 0 U.S. Army Corps of Engineers Federal Channel Limits
                                 0 Cities Ceres Street lot property survey plan
                                 0 Field surveys by Appledore Engineering, Inc. (AEI) field crew

                         2.2     Bathymetric Survey

                                 Bathymetric surveys have been completed in the River along the proposed
                                 Riverwalk corridor to determine water depths. A state-of-the art
                                 electronic "hydrosweep" multiple transducer acoustic sounding system
                                 was used to provided 100% coverage of the River bottom. This system
                                 incorporated a "real time" computer to measure pitch, roll, and yaw of the
                                 survey boat and associated transducers. Each of the four transducers took
                                 two (2) River bottom depth readings per second, producing very accurate
                                 bottom contours.


                                 A differential Global Positioning System (DGPS) located the vessel using
                                 an array of seven satellites orbiting the earth. The vessel was located by
                                 the satellites once every second producing a very accurate "real-time"
                                 horizontal location of the entire operations.

                         2.3     Waterfront Inspections

                                 A Routine Inspection was completed along the entire 800'ï¿½ length of
                                 waterfront. Underwater component of inspection covered from the
                                 mudline up to the low water level. Above water component covered from
                                 low water level up to the high tide line.









                 Piscataqua Riverwalk                        1 of 2                  Existing Conditions
                 Feasibility Study                                                                    AE1
                                                                                                     Appledore EngineerIng, Inc.








                                The scope of work for Routine Inspection included:

                                0   A Level I inspection was made on 100% of the structures to determine
                                    obvious problems.

                                    For the purpose of this study a Level I survey was essentially a "swim-
                                    by" or visual overview, with minimal cleaning of structural elements.
                                    The Level I examination confirmed as-built structural plans and
                                    detected obvious major damage or deterioration due to overstress (ship
                                    impact, ice), severe corrosion, or extensive biological growth and
                                    attack.


                                    The inspectors relied primarily on visual and/or tactile observations
                                    (depending on water clarity) to make conditions assessments. These
                                    observations were normally made over the total exterior surface area
                                    of the structure whether it is a quaywall, bulkhead, seawall, pile, or
                                    mooring. The dive was completed by four (4) of Appledore
                                    Engineering's professional Engineer-Divers. Water temperatures had
                                    dropped below 48 degrees Fahrenheit and therefore created the need
                                    for "dry suites". Both surface supplied air (Helmet Dive) and SCUBA
                                    (tanks) dive equipment were used due to the fast currents in the area
                                    and the need for voice communications to the support team located top
                                    side.






























                 Piscataqua Riverwalk                       2 of 2                 Ddsting Conditions
                 Feasibility Study                                                                  AE1
                                                                                                    Appledore Engineering, Inc.










                    111. ENGINEERING STUDIES


                             3.0      General Discussions


                                      The major sources of environmental loadings for the proposed riverwalk
                                      are wind, current wave and sometimes ice. The New England
                                      environment is subject to highly variable and often rapidly changing
                                      meteorological conditions.

                                      Damaging winter storms (Northeasters) can bring substantial hurricane
                                      force winds and are usually accompanied by abnormally high water levels
                                      and corresponding strong tidal currents.

                                      This area is also affected by tropical storms that can bring shorter duration
                                      but stronger winds.


                             3.1      Subsurface


                                      Past experience and previous geotechnical investigations indicate that
                                      subsurface conditions will typically be comprised of a thin layer (2' to 8')
                                      of sediment, fill and weathered rock fragments overlying a quartzite
                                      bedrock. This quartzite is commonly referred to as "Kittery Quartzite"
                                      and is actually metamorphic silt stone. The top V to 5' of this bedrock is
                                      typically weathered with RQD's of less than 50%.


                             3.2      Wind


                                      Wind is a serious source of loading for vessel mooring structures. We
                                      have made the following observations:

                                      ï¿½ Extreme surface wind (peak gust) measured at Pease Air Force Base in
                                           September 1960 was 65 knots out of south-south-east.

                                      ï¿½    The mean annual extreme surface wind (peak gust) measured at Pease
                                           Air Force Base is 50.3 knots.


                                      ï¿½    Fastest-mile wind speed (30 feet above ground) for 50 year mean
                                           recurrence interval is 70 knots (80 mph) for this area.









                    Piscataqua Riverwalk                              1 of 4              hutial Engineermg Studies
                    Feasibility Study

                                                                                                                    Appledore Engineering, Inc-










                            3.3     Currents


                                    Current loads on structures can be very significant due to the strong tidal
                                    currents in this area and the base flow of the Piscataqua River. We have
                                    made the following observations:

                                    0   NOAA tidal current listings indicate a maximum flood current of 3.3
                                        knots and a maximum ebb current of 3.2 knots at this section of the
                                        river.


                                    0   A 1985 Army Corp of Engineers Navigation Improvement Design
                                        memorandum included Piscataqua River current study data. A series
                                        of current meters were installed across the river at this site (Range 2).
                                        Peak measured (depth averaged) current speeds reported were about 3
                                        knots.


                            3.4     Wave


                                    The project site is sheltered from large ocean waves or swells as it is
                                    located approximately three (3) miles up the Piscataqua River from the
                                    Harbor mouth. The maximum wave fetch is about a mile upriver. Under
                                    wind conditions of 50 knots, the site is expected to see wind generated
                                    waves of 2.5 feet with a corresponding period of three (3) seconds. It is
                                    not anticipated that such short period waves will induce significant loads.


                            3.5     Ice


                                    Ice loads on marine structures can be tremendous. Review of historical
                                    data from the past few decades indicate that while the river has frozen up
                                    on rare occurrences, (1860, 1918) and ice has not been a significant recent
                                    problem to the berthing and/or mooring structures. During ice-out of
                                    Great Bay, large chucks of ice do impact on vessels and structures, but
                                    usually do not cause concern for the operators. It is recommended,
                                    however, that should an exceptional winter ice season occur, every effort
                                    be taken to minimize ice forces on moored vessels and structures.


                            3.6     Tide Levels


                                    Tidal water levels significantly impact waterfront facilities. It should be
                                    noted that post-ice-age land subsidence is occurring in northern New
                                    England. In Portsmouth, New Hampshire, this general land subsidence
                                    relative to sea level has been occurring at about one foot per one hundred
                                    years, resulting in an apparent sea level rise relative to land based
                                    benchmarks.



                   Piscataqua. Riverwalk                           2 of 4              initial Engineering Studies
                   Feasibility Study
                                                                                                                 AE1
                                                                                                                Appledore Engineering, Inc.








                                      During intense storm activity, abnormally high tides may be observed due
                                      to the effects of low atmospheric pressure, on-shore "pooling" of water
                                      from wind driven currents, and stormwater runoff.

                                      The following table presents tidal water levels based on the latest NOAA
                                      and FEMA data, based on mean lower low water (MLLW) datum as used
                                      on NOAA navigation charts. These tidal water level data are based on the
                                      tide gauge located at the PNSY, Seavey Island:


                                                                                                   MLLW
                                                                                                   Datum


                                       Lowest Observed Water Level (12/10/77)                      -3.0'
                                       Estimated Annual Low Water                                  -2.2'
                                       Mean Lower Low Water                                        0.01
                                       Mean Low Water                                              0.33'
                                       Mean Sea Level (1929 NGVD)                                  4.1 V
                                       Mean High Water                                             8.46'
                                       *Annual High Tide Line (seasonal high tide)                 10.46'
                                       10 year Recurrence High Tide                                12.1 F
                                       50 year Recurrence High Tide                                12.71'
                                       100 year Recurrence High Tide                               13.01'
                                       500 year Recurrence High Tide                               13.61'
                                       Highest Observed (2/7/78)                                   12.78'


                                       *Assumes HTL is 2' above N114W


























                    Piscataqua Riverwalk                              3 of 4              Initial Engineezing Studies
                    Feasibility Study

                                                                                                                    Appledore Engineering, Inc.










                 3.7     Workshops and Publ    ic Meetings

                         During December, 1994 and January, 1995 Bob Snover, of Appledore
                         Engineering, Inc., City Attorney Bob Sullivan and City Planner Cindy Hayden
                         met individually with many Bow Street property and business owners. The
                         purpose of these meetings was to identify issues and concerns relative to the
                         proposed Riverwalk.

                         Issues discussed at these meetings included:

                            The pros and cons of the various potential routes for the Riverwalk along the
                            Bow Street waterfront.
                            Potential impacts on waterfront views.
                            Potential impacts on economic development in the downtown area.
                            Permitting constraints and opportunities.
                            Private and public property rights.
                            Issues associated with the alleyway including access and obstacles for
                            pedestrians and deliveries.
                            Future maintenance responsibilities and liability issues.
                            Potential use of the Riverwalk to dock tall ships, cruise ships, and/or pleasure
                            boats.
                            Navigational issues regarding the tug boats.



























                 Piscataqua Riverwalk                      4 of 4           Initial Engineering Studies
                 Feasibility Study

                                                                                                  Appledore Engineering. Inc.










                  IV.    ALTERNATWE ANALYSIS


                         Numerous type, size and location alternatives were studied within the project
                         area. The following three (3) basic concepts were selected for more detailed
                         study:

                         Concept A:      200'ï¿½ western end to be reconstructed to 30'ï¿½ width to provide for
                                         increased public access and accommodate existing commercial
                                         uses (restaurants), in same approximate configuration. Remaining
                                         600'ï¿½ to be constructed to relatively narrow walkway width of
                                         12'+ and located close to the shoreline, immediately in front
                                         (Riverside) of existing granite quaywall. This concept does not
                                         provide accommodations for the berthing of vessels.

                                         Order of magnitude, 1995 construction cost estimate is $750,000
                                         for this concept, which includes construction overhead and profit.
                                         This estimate excludes inspections, surveys, studies,
                                         architectural/engineering services, project administration,
                                         land/easement acquisition, business relocation, and legal costs
                                         which may be 12% to 15% of construction costs for this size
                                         proj ect.

                         Concept B:      Similar to Concept A, this concept provides for the 200'ï¿½ western
                                         end to be reconstructed to 30'ï¿½ width to provide for increased
                                         public access and accommodate existing commercial uses
                                         (restaurants), in same approximate configuration.

                                         Remaining 600'ï¿½ to be constructed to relatively wide walkway
                                         width of 20'+. and located away from the shoreline, such that the
                                         front (riverside) of the walkway is located in approximately 18' of
                                         water (at low water). This concept provides accommodations for
                                         the berthing of tall ships and cruise ships up to 300' in length.

                                         Order of magnitude 1995, construction cost estimate is $1,500,000
                                         for this concept which includes construction overhead and profit.
                                         This estimate excludes inspections, surveys, studies,
                                         architectural/engineering services, project administration,
                                         land/easement acquisition, business relocation, and legal costs
                                         which may be 10% to 12% of construction costs, for this size
                                         project.







                  Piscataqua Riverwalk                       I of 2                 Altmative AjWysis
                  Feasibility Study                                                                  ALrf
                                                                                                     Appledore Engineering, Inc.









                     Concept C:   200'ï¿½ western end to be reconstructed to 30'ï¿½ width to provide for
                                  increased public access and accommodate existing commercial
                                  uses (restaurants), in different configurations from either Concept
                                  A or B.


                                  Similar to Concept B, this concept provides for the remaining
                                  600'ï¿½ to be constructed to relatively wide walkway width of 20'@;
                                  and located away from the shoreline, such that the front (riverside)
                                  of the walkway is located in approximately 18' of water (at low
                                  water). This concept provides accommodations for the berthing of
                                  tall shops and cruise ships up to 300' in length.

                                  Order of magnitude 1995, construction cost estimate is $1,500,000
                                  for this concept which includes construction overhead and profit.
                                  This estimate excludes inspections, surveys, studies,
                                  architectural/engineering services, project administration,
                                  land/easement acquisition, business relocation, and legal costs
                                  which may be 10% to 12% of construction costs, for this size
                                  proj ect.





























               Piscataqua Rivemalk                 2 of 2             Alternative Analysis
               Feasibility Study                                                    AEI
                                                                                    Appledore Engineeflng. Inc-















                                                                                                                                                                                                                   THIS FIGURE #AS FUNDED IN PART BY A GRANT FRCM THE OFFICE
                                                                                                                                                                                                                     OF STATE PLANNING. NEW HAMPSHIRE COASTAL PROGRAM. AS
                                                                                                                                                                                                                      AUTHORIZED By IIHE NATIONAL OCEANIC AND ATMOSPHERIC
                                                                                                                                                                                                                       ADMINISTRATION (NOAA). GRANT AWARD No. N,"70ZO237.













                                                                                                                                  -00
                                                                                   WOO                woo  woo
                                                                               woo                                                                                                                                                        ft'-, CRAM




                             T04


                                                                                                                                                            LOT
                                                                                                                                       q                     56
                                                                                                       J-
                                                                                                                                        or                                j^
                                            (d
                                    OA f@
                                         M                                                                                              S5                                X.                                                        t.'-
                                                                                                               LOT
                                                                                                               54
                                                                                                                                                                                          LOT
                                                                                                                                                                                         ..57                                 LOT
                                                                                                                                                                           -4  -11,
                                                                           LOT    53
                                                                            S2



                             Arm=
                                                            Lo                                                                                                                                                                                             [email protected]'
                                                                                                                                                                                                               V,
                                                     L6T -
           A
                                                     49


                                             LOT
                                             48

    V @16@w
           11".@j f4@A.                                                                                                                                                                                                                                           LDT
                                                                                                                               Piscataqua Riverwalk
                                                                                                                                        Concept "A"
                                                                                                                               Sherman Greiner Halle'-Appledore Engineering
                                                                                                                                  janumy 12,1995









                                                                                                                                                                                                            Civil
                                                                                                                                                                                                           Marine                                    RECONSTRUCTION OF
                                                                                                                                                                                                           Planning
                                                                                                                                                                                                          StruCtural                              PISCATAQUA RIVERWALK
                                                                                                                                                                                            IL












































































                                                                                                                                                                                                          Transportation
                                                                                                                                                                                                                                                          CITY OF PORTSMOUTH
                                                                                                                                                                         Appledore Engineering, Inc.                                                   Municipal Complex. P.O. Box 628
                                                                                                                                                                         600 State Street, Suite D                                                 Portsmouth, New Hampshire 03802-0628
                                                                                                                                                                        Portsmouth, New Hampshi  re 03801 (603) 433-8818                            (603) 4,31-2000       FAX (603) 427-1526
                                                                                                                                                                                                                            T

















                                                                                                                                                                                                                                 OEO IN PART BY A GRANT FROM THE OFFICE
                                                                                                                                                                                                               THIS FIGURE )VAS FU MG. NEW HAMIPSHIIRE COASTAL PROGRAM. AS
                                                                                                                                                                                                                  OF STA-M;PLANNI"
                                                                                                                                                                                                                   AUTHORIZED BY THE NATIONAL OCEANIC AND AI'MOSPHERIC
                                                                                                                                                                                                                   AomimISTRAmON (NOAA). GRANT AWARD No. NA47OZO237.

                                                                                                                                                                                                                                                                          LH (dedd Prow=



















                                                                       114
                                                                                                                                                        LOT
                                       OL                                                                                                                56
                                                                                                                                    LOT
                                                                        A.
                                                                      Oki-
                                                                                                           LOT
                                                                                                                                                                                j, Or
                                                                               LOT
                                                                                                                                                                                     LPT
                                                                        LOT    53                                                                                                     57
                                                                 LDT




                                                 -Loy
             -Y                                                                                                                                                                                           WT

                                          Lai.
                                          48






                                                 V11

                                            6 d


                                                                                                                                                                                                                                                           I-Or
                                                                                                                          PI'Scataqua Riverwalk
                                                                                                                                   Concept "T"
                                                                                                                          Sherman Greiner Halle'. Appledore Engineering
                                                                                                                             January 12,1995









                                                                                                                                                                                                        CiV17
                                                                                                                                                                                                       Marine                                   RECONSTRUCTION OF
                                                                                                                                                                                                       Planning
                                                                                                                                                                                                      Structural                all          PISCATAQUA RIVERWALK
                                                                                                                                                                                                      Transportation       I
                                                                                                                                                                                                                                                     CITY OF PORTSMOUTH
                                                                                                                                                                     Appledore Engineering, Inc.                                                  Municipal Complex, P.O. Box 628
                                                                                                                                                                     600 State Street, Suite D                                                 Portsmouth, New Hampshire 63802-0628
                                                                                                                                                                     Portsmouth, New Hampshire 03801 (603) 433-8818                            (603) 431-2000        FAX (603) 427-1526





                                                                                                                                                                                                          THIS FIG-  -NCED IN PART BY A GRANT RtOM 'ME OMCE
                                                                                                                                                                                                                URE WAS FU
                                                                                                                                                                                                            OF STATE PLANNING. NEW HAMPSHIRE COASTAL PROGRAM. AS
                                                                                                                                                                                                             AUTHORIZED BY THE NATIONAL OCEANC AND ATMOSPHERIC
                                                                                                                                                                                                              ADMINISTRATION (NOAA). GRANT AWARD No. MA47OZO237.
















                                                                                                   000


                                                                                                                                                                                                                              -C
                                                       .00                                                                                                                                                                                EL kzql
                              RA                                    PAn@
                                                                          I Wh,





                                                                                                                                   LOT


                                                                                                            .4
                                                                                                 _7                                                                               LOT
                                                                                                                                                                   t
                                                                         LOT    53                                                                                                57                                 Lor
                                                                   LOT
                                                                    51




                                                                                                                                                                                                      LIZ.
                                                    -q9


                                            LOT


                                                                                                                                                                                                                                                                       N
                                                                                                                                                                                                                                                                           4,



               9t



                                                                                                                                                                                                                                                      LOT
                                                                                                                                                                                                                                                      z
                                                                                                                         Piscataqua Riverwalk
                                                                                                                                  Concept "'C"
                                                                                                                         Sherman Greiner Halle'. Appledore Elgineering
                                                                                                                            januqry 12,199S                                                                                                             -7-








                                                                                                                                                                                                 Ci%47
                                                                                                                                                                                                 Marine                                 RECONSTRUCTION OF
                                                                                                                                                                                                Planning
                                                                                                                                                                                                Structural                            PATSCATAQUA RIVERWALK
                                                                                                                                                                                                                     I
                                                                                                                                                                                                Transportation
                                                                                                                                                                                                                                              CITY OF PORTSMOUTH
                                                                                                                                                               Appledore Engineering, Inc.                                                 Municipal Complex, P.O. Box 628
                                                                                                                                                               600 State Street, Suite D                             f                 Portsmouth, New Hampshire 03802-0628
                                                                                                                                                               Portsmouth, New Hampshire 03801 (603) 433-8818        1                  (603) 431-2000       FAX (603) 427-1526










                  V.     REGULATORY AGENCY PERNUTTE'4G


                         The regulatory agency permitting process has been initiated with all applicable
                         regulatory agencies through both formal and informal meetings and pre-
                         application work sessions. It is anticipated that this project will require permits
                         from the following regulatory agencies:

                         U.S. Army Corps of Engineers
                         N.H. Wetlands Board
                         N.H.. Water Supply and Pollution Control (Water Quality Certificate)
                         N.H. Office of State Planning (CZM Certificate)
                         Portsmouth Planning Board
                         Portsmouth Historic District Commission


                         Permit processing time will vary with each agency and may take at least six (6) or
                         nine (9) months, depending on the final complexity of the final project.



































                  Piscataqua Riverwalk                     1 of I        Regulatory Agency Pennitting
                  Feasibility Study
                                                                                                  AE1
                                                                                                  Appledore Engineering. Inc.










                VI.    RECOMMENDATIONS


                       While all three (3) concepts have been determined to be technically feasible,
                       Concept B was determined to be the most flexible and viable concept that best
                       accomplished the projects basic purposes, and as such is determined to be the
                       preferred alternative.

                       It should be noted that Concept B was also endorsed at the following meetings:

                               January 12, 1995     Public Meeting
                               February 23, 1995    Portsmouth Planing Board work session
                               April 17, 1995       Portsmouth City Council meeting

                       We recommend that the next steps involve the completion of the following tasks:

                               Engineering Studies

                               A.     Topographic Survey
                               B.     Subsurface Investigation
                               C.     River Current Study
                               D.     Quaywalls Investigation
                               F.     U/W Utility Crossing Investigation
                               G.     Environmental Assessment
                               H.     Design Criteria Study
                               I.     Type, Size, Location Study
                               J.     Ownership Assessment

                               Preliminary Design


                               A.     Plans
                               B.     Specifications
                               C.     Estimated Final Engineering and Construction Costs

                               Regulatory Agency Permitting

                               A.     U.S. Army Corps of Engineers
                               B.     N.H. Wetlands Board
                               C.     N.H. Water Supply and Pollution Control (Water Quality
                               Certificate)
                               D.     N.H. Office of State Planning (CZM Certificate)
                               E.     Portsmouth Planning Board
                               F.     Portsmouth Historic District Commission
                               G.     Portsmouth Building Permit

                               Public/Private Participation and Project Meetings

                Piscataqua Riverwalk                     I of 2                 Recommendations
                Feasibility Study                                                              ALrf
                                                                                              Appledore Engineering, Inc-









                               Final Design


                               A.      Plans
                               B.      Specifications
                               C.      Bid Documents
                               D.      Estimated Construction Costs


                               Construction Administration


                               A.      Bidding Process
                               B.      Contractor Submittals
                               C.      Construction Meeting
                               D.      Construction Inspections


                 (784-025.DOC)















































                Piscataqua Riverwalk                     2 of 2                  Recommendations
                Feasibility Study                                                               AE1
                                                                                                Appledore Engineering, Inc.





































































                                        Appleclore Engineering, Inc.

                                          600 State Street, Suite D
                                         AEl




                                     Portsmouth; New Hampshire 03801

                                    (603) 433-8818 m FAX (603) 433-8988