Another Sky

268 Pages·2017·23.88 MB·English

Another Sky Campground
Water Supply Project
Basis-of-Design Report

Town of Forestburgh, New York

CHA Project Number: 32849

Prepared for:

Mr. Andrew Unterberg
182 Degraw Street #3
Brooklyn, New York 11231

Prepared by:

III Winners Circle
Albany, New York 12205
[phone]

September 2017
TABLE OF CONTENTS

1.0 Introduction........................................................................................................................ 1
1.1 Background .............................................................................................................. 1
1.2 Purpose and Scope ................................................................................................... 1
2.0 Water Demand Evaluation ............................................................................................... 1
2.1 Domestic Demand Evaluation ................................................................................. 1
2.2 Fire Flow Demand Evaluation ................................................................................. 2
3.0 Hydraulic Model ................................................................................................................ 3
3.1 Hydraulic Model Results ......................................................................................... 3
4.0 Basis-of-design for Water System Improvements .......................................................... 4
4.1 Proposed Water System ........................................................................................... 4
4.2 Booster Pump Station .............................................................................................. 4
4.2.1 Booster Pumps ............................................................................................. 4
4.2.2 Flow Metering ............................................................................................. 4
4.2.3 Hydropneumatic Surge Tank ....................................................................... 4
4.2.4 Backflow Prevention Device ....................................................................... 5
4.3 Water Distribution System ...................................................................................... 5
4.3.1 Background .................................................................................................. 5
4.3.2 Water Main .................................................................................................. 5
4.3.3 Gate Valves .................................................................................................. 5
4.3.4 Water Services ............................................................................................. 5
4.4 HydropneUmatic/Chlorination Station .................................................................... 5
4.4.1 Hydropneumatic Tank ................................................................................. 6
4.4.2 Chemical Feed Systems ............................................................................... 6
4.4.3 Chemical Storage ......................................................................................... 7
4.5 Ancillary Basis-of-Design Information ................................................................... 7
4.5.1 Booster Pump Station and Hydropneumatic/Chlorination Station Plan ...... 7
4.5.2 Monitoring & Control .................................................................................. 8
4.5.3 Stand-By Power Facilities ........................................................................... 8
4.5.4 Safety Equipment ......................................................................................... 8
5.0 Implementation Plan ......................................................................................................... 9
5.1 Capital Cost ............................................................................................................. 9
5.2 Operations and Maintenance Cost ........................................................................... 9
5.3 Project Financing ..................................................................................................... 9
5.4 Regulatory Permits and Approvals .......................................................................... 9
Tables

Table 3-1 Static Pressures within Distribution System
Table 4-1 Chlorination Feed System Design Specifications
Table 4-2 Sodium Hypochlorite Storage Design Specifications

Figures
(located at the end of the report)

Figure 1-1 Site Location Map
Figure 3-1 Hydraulic Map Layout

Appendices
(located at the end of the report)

Appendix A Water Demand Calculations
Appendix B Disinfection Specifications
Appendix C Equipment Cut Sheets
1.0 INTRODUCTION
1.1 BACKGROUND
The Another Sky Campground Project is located in Sullivan County and is programmed to have
up to 100 tent only campsites, a Lodge and General Store building, two bath houses with a total
of 16 bathrooms and 16 showers (8 for each sex), swimming pond and outdoor eating pavilion
and associated parking and utilities There is currently no public water supply system within
proximity of the site and as such an on-site system of drilled wells and treatment will be
necessary to provide an adequate drinking water supply for the project.

1.2 PURPOSE AND SCOPE
Another Sky Campground has authorized CHA Consulting Inc. (CHA) to prepare the basis-of-
design for a new water system, capable of providing potable drinking water for the project. This
report includes the following:

 A water demand evaluation;
 An evaluation of the previously drilled wells and their ability to supply the necessary
capacity;
 Summary of the hydraulic model used to evaluate the proposed system;
 Basis-of-design for all water system improvements; and
 Proposed implementation plan.

2.0 WATER DEMAND EVALUATION
2.1 DOMESTIC DEMAND EVALUATION
Based on the New York State Department of Health (NYSDOH) “Residential Onsite Wastewater
Treatment Systems, 2012” design manual, the water supply demands were determined using the
following:
 Campground demand (including showers) per site - 55 GPD
 Café in Lodge (Fast Food type seating) per seat - 25 GPD

The following is a summary of the water supply demand:
 100 campsites x 55 GPD = 5500 GPD
 30 Seats x 25 GPD = 750 GPD

Peaking factors of 5 (for maximum day demand) and 10 (for peak hourly demand), as per the
NYSDOH “PWS-41, 1993” reference manual, were also used to calculate demands of the

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CHA Project No: 32849 Page 1
district. As such, the full build-out average daily, maximum day, and peak hourly water
demands were calculated to be as follows:

 Average daily demand (ADD) – 6,250 gpd; 4.3 gallons per minute (gpm)
 Maximum day demand (MDD) – 12,500 gpd; 9 gpm
 Peak hourly demand (PHD) – 62,500 gpd; 43 gpm

The proposed booster pumping system, hydropnuematic/chlorination station, and distribution
system would be sized to meet both of these design scenarios. A copy of the design demand
calculations are included as Appendix A.

2.2 FIRE FLOW DEMAND EVALUATION
A fire flow analysis for the distribution system was not completed as the system is for potable
drinking water only. A dry system will be installed within the lodge building with a standpipe as
per the Town of Forestburgh Fire Department.

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3.0 HYDRAULIC MODEL
A hydraulic model of the proposed water system was developed using the software package
WaterCAD V8i, as developed by Bentley Systems, Inc. WaterCAD is an AutoCAD add-on
program used for the design and analysis of pressurized distribution systems. The hydraulic
model for the proposed water system consisted of the source (modeled as a reservoir), pumps,
pipes, valves, and junction nodes.

The routing of the proposed water system with the campground was developed from the
proposed water system layout Elevations for water system features were based on topographic
mapping generated from the a previous site specific survey for the project.

3.1 HYDRAULIC MODEL RESULTS

The hydraulic model was used to simulate an ADD and MDD of 4.3 and 9 gpm, respectively, in
the distribution system at full build-out. As outlined previously, due to the size of the proposed
water system, the NYSDOH requires that a peaking factor of 10 be used when evaluating the
peak instantaneous demand, which was calculated to be 43 gpm. Hydraulic modeling of fire
flows was not included in this evaluation as fire protection is not being provided for this system.

The hydraulic model has demonstrated that the minimum static pressure required by the
“Recommended Standards for Water Works” is 35 psi for domestic water systems, with normal
working pressures between 60 and 80 psi have been met. The hdyroneumatic tanks are staged to
turn on when the pressure in the system falls to 60 psi and will turn off when pressures in the
system reach 80 psi. Refer to Table 3-1 for the layout and end of pipe results

Table 3-1: Static Pressures within Distribution System
Pressure Reading (psi) Pressure Reading (psi)
Location
Pumps at 60 psi Pumps at 80 psi
At Pump Station 60 80
At Southern Bathroom 36 56
At Lodge 58 78
At Northern Bathroom 66 86
Based on the above pressure results calculated in the hydraulic model, the distribution system
will meet the Ten States Standards pressure requirements.

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4.0 BASIS-OF-DESIGN FOR WATER SYSTEM IMPROVEMENTS
This section of the report presents the basis-of-design for the proposed water supply system.
Preliminary design drawings, including a floor plan are included in the Figures Section at the end
of the Report. Design calculations to support this basis-of-design report are included in
Appendix B.

4.1 PROPOSED WATER SYSTEM
The proposed water system for the project would consist of a combined booster pump station and
hydropneumatic/chlorination station to be located at the eastern side of the existing wells noted
previously as wells 8 and 9. The hydraulic model outlined in Section 3.0 of this report has been
used to verify pressures and pump sizing prior to the preliminary design of the system.

4.2 BOOSTER PUMP STATION
The booster pump station would consist of vertical turbine booster pumps, a hydropneumatic
surge tank, magnetic flow meter, backflow prevention device, and associated instrumentation.
The pump station would be pre-manufactured with all components within the station coming
factory assembled prior to arrival onsite. The station would be manufactured by Engineered
Fluid Inc., or approved equal. The following describes the design specifications of the selected
equipment.

4.2.1 Booster Pumps
Three inline vertical turbine booster pumps are anticipated to be installed in the booster pump
station to provide water from the wells to the proposed on-site water distribution system. Each
pump would have a rated capacity and would be equipped with a VFD. This design pump flow
rate is currently under design, however it can be assumed that with two pumps operating the
peak hourly demand would be met with the third pump available for redundancy per the
requirements of the “Recommended Standards for Water Works.”
4.2.2 Flow Metering
The booster pump station would be equipped with a flow meter to continuously monitor flow
leaving the pump station. The meter selected would be a 4” magnetic flow meter manufactured
by Endress+Hauser, or approved equal. The flow meter would be supplied with a local display
and have the capability of providing a 4-20 mA output signal if required for connection to the
monitoring and control system

4.2.3 Hydropneumatic Surge Tank
Due to the hydraulics of pumping over the site there is a concern that when the pumps shut
down, there could be a surge of water that rushes back towards the pump station due to an

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elevation drop of approximately 30 feet. To hedge the increased pressures caused by this, a
hydropneumatic surge tank would be installed within the booster pump station to handle surges
that may occur during operation. The tank would have a capacity of 53 gallons and be rated for
up to 250 psi in pressure. The tank would be manufactured by Thrush, or approved equal and be
installed on the discharge side of the inline vertical turbine pumps.

4.2.4 Backflow Prevention Device
A backflow prevention device would be installed within the booster pump station as the water
main enters the station. The device would be a 4” double check valve manufactured by Watts, or
approved equal.
.
4.3 WATER DISTRIBUTION SYSTEM
4.3.1 Water Main
The proposed water distribution system would primarily consist of 4” HPDE or polyvinyl
chloride (PVC) C-900 DR 14. Water main fittings would be of similar materials with
mechanical joint ends. Fittings would be attached to the water main using joint restraints and
concrete thrust blocks. All pipe and fittings would be installed with at least 2.5 feet of cover,
since the system will be drained during the early fall, winter and early spring months.

4.3.3 Gate Valves
Resilient wedge gate valves would be installed with the new water main for isolation and water
main maintenance purposes. Per the Recommended Standards for Waterworks, valves would be
- located at water main intersections. Gate valves would be Model A2360 by Mueller Co. or
approved equal.

4.3.4 Water Services
Water services would be C-900, ranging in size from ¾-inch to 2-inch in diameter. Services
would comply with American Water Works Association (AWWA) standards.

4.4 BOOSTER PUMP AND HYDROPNEUMATIC/CHLORINATION STATION
The hydopneumatic/chlorination station would be located on the southwestern portion of the site
as noted on sheet C-612. The station would consist of two hydropneumatic tanks, a chlorination
feed system, pressure reducing valve, and all associated instrumentation. The station could be
pre-manufactured with all components within the station coming factory assembled prior to
arrival onsite and be manufactured by Engineered Fluid Inc., or approved equal. This following
describes the design specifications of the selected equipment.

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4.4.1 Hydropneumatic Tank
As discussed previously, water from wells would be sent to the booster pump station to provide
adequate pressure to the facility, a hydropneumatic tank system has been selected in lieu of
constructing an elevated water storage tank. The hydropneumatic tank system would operate
based on a pressure range such that the booster pumps would turn on when the static pressure is
approximately 60 psi and shut off when the pressure reaches 80 psi. The hydropnuematic tanks
are under design however we would anticipate that there may be the following:
• 200 gallons in size
• Rated for up to 250 psi in pressure.
• The tanks would be manufactured by Thrush, or approved equal.
4.4.2 Chemical Feed Systems
Chlorination is required to maintain the chlorine residual in the distribution system per
“NYSDOH Part 5, Subpart 5-1, Public Water Systems”. This standard requires a minimum
residual of 0.2 mg/L be maintained in potable water distribution systems.

The chemical feed system is currently under design, however the system would likely contain the
following elements:
• Two chemical feed pumps, each with a 1.98 gallon per hour (gph) capacity, would be
installed using a prepackaged dual dosing system, including piping, fittings, valves,
calibration columns, and stands. Only one pump would operate at a time, with the second
provided for system redundancy per the “Recommended Standards for Water Works.”
Additionally, per the “Recommended Standards for Water Works,” and a contact time of
30 minutes is required before water reaches the first service connection. This contact
time would be achieved by utilizing the 400 gallon volume within the hydropneumatic
tanks and 200 linear feet of PVC or HDPE water main on the discharge side of the
hydropneumatic/chlorination system.
Table 4-2
Chlorination Feed System Design Specifications
Chemical Sodium Hypochlorite (NaOCl)
Mechanical Diaphragm, Viton seals, auto-degassing
Pump Type
head
Quantity Two
Manufacturer Grundfos or approved equal
Model Under Final Design
Pump Capacity 1.98 gph (3000:1 Turndown)
Trade Strength 12.5%
Design Dose Rate 0.25 gph (hydraulic capacity); 0.01 gph (ADD)

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4.4.3 Chemical Storage
The chemical storage tank for this project is sized based on the “Recommended Standards for
Water Works.” A 30-gallon tank would be provided which contains approximately 4 months of
storage at full build-out. The tank would be as manufactured by Den Hartog Industries, Inc, or
approved equal. The storage tank has a cylindrical cone bottom configuration and tank stand to
allow for draining and cleaning of the tank. The tank would be constructed of linear
polyethylene, with a ultrasonic level transmitter, vent, drain, and molded in liquid level
indicating scale. Secondary containment is not required as the volume is below the minimum
185-gallon requirement as per “New York State Department of Environmental Conservation
(NYSDEC) Chemical Bulk Storage Regulations”. A polyethylene spill pallet would be used for
the tank to accommodate minor chemical spills. The design specifications for each tank are as
follows:

Table 4-
Sodium Hypochlorite Storage Design Specifications
Chemical Sodium Hypochlorite (NaOCl)
Tank Type Conical Bottom with Polyethylene Stand
Quantity One
Tank Capacity 30 gallon
Manufacturer Den-Hartog Industries, Inc. or approved equal
Trade Strength 12.5%

4.5 ANCILLARY BASIS-OF-DESIGN INFORMATION
Miscellaneous design information not described in previous sections of this report are presented
below. These items include: booster pump station plan, hydropneumatic/re-chlorination station
plan, stand-by power facilities, and safety equipment.

4.5.1 Combined Booster Pump Station and Hydropneumatic/Chlorination Station Plan
The new combined booster pump station and hydropnuematic/chlorination station would be
located as noted sheet C-612 . The building is currently under design, however the major
building and site characteristics for the hydropneumatic/re-chlorination station are as follows:

 Building: Pre-Engineered (Owner to Select Interior/Exterior Finish)
 Lighting System: Fluorescent lighting fixtures
 Heating System: Wall-mounted unit heaters
 Ventilation System: Automatic louvers and exhaust fans

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