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HomeMy WebLinkAbout064Pleasant Harbor Marina and Golf Resort Water and Sewer Systems Engineering Report December 29, 2011 Prepared for Statesman 7370 Sierra Morena Blvd, S.W. Calgary, Alberta, T31-1 41-19 Prepared by: Craig A. Peck & Associates 11402 40th Avenue E. Tacoma, WA 98446 Water Service AFFECTED ENVIRONMENT Water system infrastructure within the MPR area includes supply wells, storage facilities, and distribution pipelines. • Water Supply — Seven wells supply water to the area within the MPR. Two wells within the marina upland area provide water for the marina. One well provides water to the single family Harborview House. One well serves the bed and breakfast structure. One well provides water for the Black Point campground. Two wells within the MPR area serve areas outside the MPR boundary. These two wells provide water to the Pleasant Tides water system. Those two wells are located north of Black Point Road. • Water Storage — Two storage tanks serve the area within the MPR. One metal tank is located in the marina upland area. One wood stave tank is located on the hill top in the southeast quadrant of the Black Point campground. Water Distribution —Two water distribution systems are within the MPR. A limited extent system within the marina upland conveys water to three buildings and the docks. This system consists of small diameter plastic piping. A significantly larger distribution system exists within the Black Point campground to provide water directly to campsites in the north central area, the lodge building, restroom building, pool, storage building area, and park entrance buildings. This system is not currently fully functional. POTENTIAL IMPACTS DURING CONSTRUCTION Alternative 2 Construction of a new water distribution system would be required throughout the MPR area. The new system would be constructed under or near new roadways to reduce the need for clearing and grading — see Figures 1A and 1B. In some locations the water system could cross golf fairways to reduce overall length or to provide for looped connections to improve flow rate and pressure. The water distribution system would be within easements. Construction activities related to installation of the distribution mains may include temporary disruptions in service to some areas; noise and dust during construction; and construction -related traffic to deliver pipe and other materials to the site. Alternative 1 The construction impacts would be similar in Alternative 1. No Action A new water distribution system would not be created under the no action alternative. If use of the campground were to be resumed, repair and replacements of portions of the distribution system would be required to return that system to an operational condition. �\ 3 g$01 E m Y S s Z CD L'A o Y � b M > t GOLF COURSE WATER SYSTEM-PREDESIGN Craigg A. Peck & Associates uwx ou c. Nrq NA YMab ( Hao -'sex • :(isi)xao-�sxs POTENTIAL DEVELOPED -CONDITION IMPACTS Alternative 2 The Pleasant Harbor Marina and Golf Resort is anticipated to generate an annual water supply demand of at least 93 acre feet per year or approximately 30 million gallons. This is based on an Average Daily Demand (ADD) of 175 gallons per day per Equivalent Residential Unit (gpd/ERU) and the variation in seasonal residential occupancy. Potable residential water use has been projected to be approximately 132,100 gpd during periods of maximum occupancy (85 percent occupancy). Potable water use is anticipated to be reduced from the 175 gpd/ERU with the use of low flow plumbing fixtures. Optimal demand could be 70 gpd/ERU. This water demand does not include irrigation or fire protection which would be provided with rainwater and reuse water from the sanitary sewer treatment plant stored in the Kettle B, Irrigation Pond, when completed. The irrigation pond capacity is approximately 120 million gallons. During initial phases of the development, fire protection and some areas of landscape will require potable water use, but during later phases fire protection and irrigation water will be provided from irrigation system. Creation of a multi-purpose utility district is proposed to own, operate, and maintain the new water system. System user fees would be paid to the district to cover the ongoing costs of the system. Those costs would be expected to increase over time with the costs of supplies and labor. Alternative 1 Water supply demand for potable water use would be identical to Alternative 2. No Action A new water source would not be required if the No Action Alternative were selected. MITIGATION MEASURES Incorporated Plan Features. As new water system infrastructure is constructed within the MPR boundary, operational impacts of the existing supply and distribution systems may be mitigated as older aging facilities such as wells and reservoirs are no longer needed, The existing distribution systems could be abandoned as the new system is constructed. Operating and maintenance costs would be recovered by utility rates charge by the district and paid by actual users. Applicable Regulations. All proposed water system improvements would be designed and constructed in compliance with applicable local and State regulations, including: • Jefferson County • Washington State Department of Health • Jefferson County Fire District No. 4 Actual domestic water service requirements will be determined at the time of specific land use applications, based on population projections, and fixture counts. The fire flow requirements will be based on number of hydrants, building types and sprinkler usage. Water meters will be installed at each building or at another connection point using water and pipe/meter sizes to be determined on the basis of domestic flow volumes and fire flow needs. Fire flow will be provided by the project irrigation/fire flow system following completion and filling of the irrigation pond in Kettle B. Other Possible Mitigation Measures. The district would notify existing customers in advance of potential temporary disruptions to service during new water main construction. SIGNIFICANT UNAVOIDABLE ADVERSE IMPACTS No significant unavoidable adverse impacts to the water systems within the MPR boundary have been identified. Construction of new infrastructure should be paid for by the owner/developer of the project that generate the increase demand, or collected through new connection fees within the project phases; therefore, there should not be a significant unavoidable adverse economic impact to existing district water system customers. Sewage Collection, Treatment, and Reuse/Discharge AFFECTED ENVIRONMENT The existing wastewater collection, treatment, and discharge systems are owned, operated, and maintained by the proponent and the Bed and Breakfast property owners, and consist of gravity sewer collection systems, septic and pump tanks, pumps, forcemains, and subsurface drainfields. There are several septic systems throughout the campground area that are currently not in use. These include systems near restroom buildings, lodge building, and entrance building. The drainfield for the marina is located outside the MPR boundary on the opposite side of US Highway 101 from the marina on the hillside. The sewage system at the marina has a waste volume large enough to require regular inspection by the Washington State Department of Health. The other systems within the MPR are subject to local health department regulations. POTENTIAL IMPACTS DURING CONSTRUCTION Alternative 2 The MPR area has no existing centralized sewage collection or treatment infrastructure. Construction of a new gravity sewer system and/or individual building sewer pump station and forcemains connected to the gravity sewer system would be required throughout the MPR — see Figures 2A and 2B. The system would be constructed within easements located under or adjacent to roadways or across golf course fairways for efficient conveyance. The existing septic and pump tanks and subsurface drainfields would be decommissioned in place or removed. Construction activities related to installation of the collection and conveyance system may include temporary disruptions in service to some customers; noise and dust during the construction phase; and construction -related traffic to deliver pipe and other materials to the construction sites. A new wastewater treatment plant (WWTP) would be designed to treat 280,000 gallons per day of wastewater. Construction of the WWTP would begin as State 1 Phase 1 of the project and be completed prior to occupancy of any proposed building within the project. Construction would result in construction -related traffic for transport of material to the site, noise and dust associated with earthwork activities, and the operation of construction equipment on the site. r, pp MARINA PUMP a 2 �F— STATION A A m 5 A FTl CD >� m FORCE MAIN (TYP) Nm PACKAGED SIMPLEX PUMP STATION C-1 I PACKAGED SIMPLEX PUMP STATION C-2 I PACKAGED DUPLEX PUMP STATION D-1 PACKAGED DUPLEX PUMP STATION D-2 \\lr7 f 0 MARITIME PUMP STATIONK Bqo\ / \ \` z p II -0 -- ---�-_ -- - �' IN ' \ i 1 i US 101 UMP HIGHWAY i ttt' Ii 1\ J; f ` C •..,• . 1 11 srnnoN PACKAGED DUPLEX 411 - .- f PUMP STATION D-3 r �` O PUMP STATION I :I it PACKAGED DUPLEX I o PUMP STATION D-4 I r' FORCE MAIN (TIP) WATER (TYP) O H I to Im n L74 \ PACKAGED DUPLEX [rJ PUMP STATION D-5 I \( I t I I ; I L 51' PACKAGED DUPLEX P P STATION D-7 8 DUCKABUSH , PACKAGED DUPLEX PUM STATION D-6 € GOLF COURSE SEWER SYSTEM-PREDESIGN P ck9 &. Associates 11---e. T.- MA YBMO E M cYwrocRwncwl.nrl (xvkao-s�az � rAx: (zsa)zoo-�ua Construction of a gravity collection system would likely have a longer duration than construction of a pump station and forcemain system because gravity sewers are deeper than forcemains. Deeper pipelines require longer excavation and backfill periods of time and also are more likely to encounter difficult construction conditions including large glacially deposited rocks. Alternative 1 Wastewater treatment and conveyance demand would be similar to Alternative 2. No Action Alternative There would be no wastewater system construction associated within the MPR site in the near future if the No Action Alternative were selected. POTENTIAL DEVELOPED -CONDITION IMPACTS The Pleasant Harbor Wastewater Technical Report (Esvelt, January 2012) developed wastewater flow and loading projections based upon the projected build -out population. The per capita loading projections are inclusive of residential, commercial, and public facility land uses. The loading projections were used to evaluate the necessary capacity of improvements for future wastewater conveyance, treatment, and reuse facilities. Operation of new wastewater collection system, conveyance system, and treatment plant on the site as proposed would result in transportation impacts for waste sludge from the site to a processing facility, fuel for standby generators, and chemicals for the treatment processes. Waste sludge would be hauled by tanker trucks along US Highway 101 to the treatment facility near Shelton. Fuel and chemicals would be hauled to the site. Operation of a new wastewater treatment plant on the site would result in increased noise levels, release of odors, and energy consumption. Each of these impacts are described in greater detail in technical reports in the Appendix. Creation of a multi-purpose utility district is proposed to own, operate, and maintain the new wastewater treatment and conveyance systems. System user fees would be paid to the district to cover the ongoing costs of the system. Those costs would be expected to increase over time with the costs of supplies and labor. MITGATION MEASURES Mitigation measures for the wastewater collection, treatment, and reuse requirements for Alternatives 1 and 2 would be roughly the same given the similar size of the development and resulting impacts. The wastewater treatment plant will discharge Class A treated waste to the irrigation pond to mix with collected storm runoff. This water will be used to irrigate areas within the project area and return water to the aquifer. Applicable Regulations. The Pleasant Harbor Marina and Golf Resort would comply with all applicable wastewater collection, treatment, and reuse criteria set forth by the multi-purpose utility district, County, and State in permit conditions. Other Possible Mitigation Measures. Over the course of the projected 10 -year development of Pleasant Harbor Marina and Golf Resort and the extension of fiber optic cabling throughout the project, it may be possible that technologies could be implemented to more closely monitor the infiltration of re -use water and stormwater runoff and better control distribution of these resources. SIGNIFICANT UNAVOIDABLE ADVERSE IMPACTS It would be necessary to expand the wastewater treatment plant in the future to serve the full build -out condition. The construction of the components in the plant should be paid for by the developer or collected through new connection fees within the developing areas, therefore, there should not be a significant unavoidable adverse economic impact to existing sewer system customers.