Section 5 Existing Collection System_201404161712462116

Section Existing Collection System 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 5.14 5.15 5.16 5.17 5.18 5.19 5.20 5.21 5.22 5.23 5.24 5.25 5.26 5.27 Wastewater Collection System for the Chambers Creek Basin Conveyance System Backbone - Existing Interceptors & Force Mains University Place West Sub-Basin University Place East Sub-Basin Oakbrook Sub-Basin Lakewood West Sub-Basin Lakewood East Sub-Basin Dupont Sub-Basin South Tacoma Sub-Basin Summit-Waller Sub-Basin Parkland Sub-Basin Brookdale/Golden Given Sub-Basin Spanaway Sub-Basin Frederickson Sub-Basin East Basin Sub-Basin Rainier Terrace Sub-Basin Hylebos Sub-Basin BROWNS POINT/DASH POINT SERVICE AREA Chambers Creek Properties Sub-Basin Canyon Sub-Basin Cascadia Sub-Basin Metering Locations and Flow Monitoring Collection System Operations & Maintenance Infiltration and Inflow Capacity Restrictions Well-Head Protection Large On Site Sewer Systems (LOSS) Maintained By Pierce Pierce County Public Works and Utilities – Sewer Utility Unified Sewer Plan Update Section Section – Existing Collection System Section documents the existing wastewater collection system of the Chambers Creek Regional Wastewater Treatment Plant (WWTP) 5.1 Wastewater Collection System for the Chambers Creek Basin The Utility owns the collection facilities in Parkland, Spanaway, Frederickson, Graham, South Hill, the cities of University Place and Lakewood, and the City of DuPont The City of Tacoma and Town of Steilacoom own the collection facilities within their respective jurisdictions 5.1.1 Chambers Creek Conveyance System The conveyance system has 58,960 (2009) connections and includes approximately 658 miles of public sewer and 172 miles of private sewer pipelines ranging in size between 8-inches (for local collection) and 84-inches in diameter (for the largest interceptor), with 15,964 manholes to access the sewer lines The system service area is 117 square miles or 74,880 acres in total area The County’s Wastewater Utility also operates and maintains 95 pump stations with four new stations in design, and 825 residential grinder pumps in the Chambers Creek Basin (basin) 5.1.2 City of Tacoma – Western Slopes The Western Slopes service area lies adjacent to the east shore of Tacoma Narrows and extends from North 26th Street in Tacoma to the City of University Place on the south and Pearl Street on the east The system service area is 1,804 acres in total area and drains northeasterly toward the Tacoma Narrows The area formerly flowed to the now decommissioned Tacoma Western Slopes WWTP a primary wastewater treatment plant operated by the City of Tacoma Wastewater from this service area was transferred to the WWTP in 1990 with the construction of two pump stations and conveyance pipes The Western Slopes service area is pumped th to the Chambers Creek conveyance system by the South 27th Street and 19 and Grandview Pumping Station 5.1.3 City of University Place The City of University Place is located east of Puget Sound, west of the City of Fircrest and 56th Street West, south of South 19th Street West and north of Chambers Creek The system service area is 5,323 acres in total area Portions of University Place were originally served by the City of Tacoma Western Slopes Treatment Plant and the Westside Sewer District In the 1970s two (2) Pierce County ULIDs, 70-1 and 76-1, incorporated much of the remainder of University Place into the Pierce County sewer service area In 1990 the City of Tacoma closed the Western Slopes Treatment Plant and transferred its service area flows to the WWTP for treatment In 1992, Pierce County assumed the Westside Sewer District, which served the northwestern portion of University Place There are several pockets in University Place, approximately 980 residences, a total of 1800 developed and undeveloped properties without sanitary sewer service The largest pocket lies in the vicinity of the 67th Avenue West Interceptor south of Fircrest to Cirque Drive, between Alameda and Orchard Street The City of University Place has conducted feasibility studies to connect these remaining parcels to sanitary sewers 5.1.4 Town of Steilacoom The Town of Steilacoom’s present wastewater service area encompasses nearly 1,850 acres, of which approximately 1,050 acres is sewered The town entered into a 50-year sewage service and rate agreement with Pierce County in 1987 Pierce County provides treatment services; Steilacoom is responsible for collection and maintenance December 2010 5-1 Pierce County Unified Sewer Plan Existing Collection System Section 5.1.5 City of Lakewood The City of Lakewood, excluding the areas known as American Lake Gardens and Tillicum, is located within Utility Local Improvement District (ULID) 73-1, which is the core of the sewer service basin American Lake Gardens and Tillicum were originally intended to send flows to the Tatsolo Point WWTP on the Joint Base Lewis McChord military reserve American Lake Gardens and Tillicum, containing 968 single family and 1,124 multifamily homes will continue to be served by both individual and community on-site sewer systems until the City of Lakewood completes an extension to allow both Tillicum and American Lake Gardens to connect to the sewer system These flows are proposed to be directed to the Chambers Creek Regional Wastewater Plant in late 2011.The system service area is 11,041 acres in total area 5.1.6 DuPont - Northwest Landing The City of DuPont is located in the southwest corner of the Basin and has contracted with Pierce County to provide sewer service to the Northwest Landing development (ULID 90-4) In October of 2000, the Northwest Landing Offsite Wastewater Facilities Project was completed and wastewater is now conveyed to the WWTP The Historic Village of DuPont was connected and flows began to be sent to the WWTP in 2008 Pierce County now provides for collection, transmission, and treatment for flows from the Northwest Landing Development (Villages I, II, III, IV, and V), Industry, Town Center, and the Historic Village of DuPont The system service area is 3,727 acres in total area 5.1.7 Eastern Basin - Brookdale, Midland, Parkland, Spanaway, Graham, Frederickson, Cascadia, and South Hill The eastern portion of the Chambers Creek - Clover Creek Basin contains the largest part of the planning area The 1986 Sewerage General Plan Update defined the East Basin to include Midland, the drainage of Clover Creek from presently sewered areas of Parkland, Brookdale, and Spanaway, south to Rocky Ridge and east past Frederickson and Meridian Avenue (SR161) In 1989, the Pierce County Council approved the inclusion of additional areas to the east of Meridian Avenue into the Chambers Creek - Clover Creek East Basin The South Hill Sewer District, in unincorporated Pierce County, was added to the Chambers Creek Regional WWTP system in 1996 The connection to the Chambers Creek Regional WWTP system is located at the end of the East Basin Interceptor The system service area is 58,965 acres in total area December 2010 5-2 Pierce County Unified Sewer Plan Existing Collection System Section 5.2 Conveyance System Backbone - Existing Interceptors & Force Mains Interceptors and force mains form the backbone of the conveyance system Pierce County typically installs interceptor lines 15” in diameter and larger and force mains 8” in diameter and larger These are the trunk and large branches of the system into which the wastewater from local collection systems flow Existing interceptors, force mains, and pump stations for the WWTP sewer service basin are described in Tables 5.3-1 through 5.19-1 and illustrated in Figures 5.1-1 through 5.19-1 A complete inventory of the Utility’s sewer conveyance system may be found in USP Appendix K Pipe diameter ranges signify that the size of the pipeline changes over the course of its length Each table and corresponding figure is broken down by sewer service sub-basin Figure 5.1 identifies the general location of each sub-basin The sub basins include:  University Place West Sub-basin  University Place East Sub-basin  Oakbrook Sub-basin  Lakewood West Sub-basin  Lakewood East Sub-basin  DuPont Sub-basin  South Tacoma Sub-basin  Summit-Waller Sub-basin  Parkland Sub-basin  Brookdale/Golden Given Sub-basin  Spanaway/Roy Sub-basin  Frederickson Sub-basin  East Basin Sub-basin  Rainier Terrace Sub-basin  Hylebos Sub-basin  Brown’s Point Sub-basin  Chambers Creek Sub-basin  Canyon Sub-basin  Cascadia Sub-basin December 2010 5-3 Pierce County Unified Sewer Plan Existing Collection System 16 rc Ruston Key to Conveyance System Maps e Pi Gig Harbor e/ ng Ki Sewerage Sub-basin Area/Service Areas C n ou Ê Ô 509 Sub-Basin Name University Place West University Place East Oakbrook Lakewood West Lakewood East DuPont South Tacoma Summit-Waller (Mid Counties) Parkland 10 Brookdale/Golden Given Brookdale (South Area) Golden Given (North Area) 11 Spanaway and Roy 12 Frederickson 13 East Basin 14 Rainier Terrace 15 Hylebos 16 Browns Point 17 Chambers Creek Properties 18 Canyon 19 Cascadia ty Bo d un £ ¤ 16 y ar £ ¤ 163 *Note: Pierce County Lake Tapps Service Area Removed per Resolution R-2001-189 (Transfer Agreement #01-1269 Dated 03/29/02) Tacoma Đ Ư ă 705 Fox Island Tacoma Central WWTP ! Ê Ô 99 509 Fircrest Đ Ư ă Pacific 15 Milton Fife McNeil Island Ê Ô Ê Ô Edgewood Ê Ô 167 Ê ¤ 161 University Place Chambers Creek Regional WWTP ! £ ¤ 167 17 Auburn Sumner £ ¤ 167 Ê Ô Bonney Lake 410 Steilacoom Puyallup Lakewood Contract Service Area Ê Ô 410 Other Service Area Tributary to Chambers Creek WWTP Ê Ô 512 10 Potential Pierce County Service Area Currently Connected to Other WWTP Pierce County Sewer Service Area Tributary to the C/O Tacoma 18 ! 13 Cascadia 10 DuPont 19 Ê Ô 14 161 Đ Ư ă 11 12 Ê Ô 507 Ê Ô Insert 11 Roy Wastewater Treatment Plants Orting Ê Ô 162 Municipal Boundary State, Federal or County Route Water Features N NTS Figure 5.2-1 DISCLAIMER The map features are approximate and are intended only to provide an indication of said feature Additional areas that have not been mapped may be present This is not a survey Orthophotos and other data may not align The County assumes no liability for variations ascertained by actual survey ALL DATA IS EXPRESSLY PROVIDED ‘AS IS’ AND ‘WITH ALL FAULTS’ The County makes no warranty of fitness for a particular purpose PIERCE COUNTY, WASHINGTON Pierce County Sub-Basins/Service Areas Pierce County Unified Sewer Plan Date: December 2010 Roy Section 5.3 University Place West Sub-basin The University Place West Sub-basin is located within the City of University Place and is bordered to the west th by Puget Sound, to the north by 19 Street West, to the south by Chambers Creek and to the east at approximately Bridgeport Way The sub-basin is made up of the University Place North ULID 70-1, Soundview ULID 76-1, Westside Sewer District, numerous developer extensions, and flows transferred from the City of Tacoma’s Western Slope Sub-basin Flows received from the City of Tacoma connect to the Chambers Creek Regional WWTP collection system at th approximately 19 Street West and Grandview Drive The University Place West Sub-basin consists of approximately 3,990 acres The size and linear footage of mains in this sub-basin is identified in the table below and is graphically represented in Figure 5.3-1 Table-5.3-1 University Place West Sub-basin Existing Conveyance System Interceptor Pipelines Facility Name Size (inches) Length (feet) Chambers Creek Tunnel 72 7,433 lf Day Island Trunk 15 1,691 lf Grandview Drive Interceptor 30 9,600 lf Sunset Drive Trunk 15 2,710 lf 20 – 24 9,835 lf 2–4 1,540 lf – 12 301,493 lf Tacoma Western Slopes Force Main Small Collectors Force mains Gravity mains Pump Stations No Name Type Location Capacity in (gpm) Current AWWF (MGD) Current ADWF (MGD) Wet/Dry Well South 19th Street and Day Island Way 200 0.30 0.22 Wet/Dry Well 2400 Day Island Boulevard 300 0.06 0.06 Soundview Self-Priming West 38th Street and Soundview Drive 185 0.02 0.01 13 Grandview Submersible 4009 Grandview Drive West 770 0.22 0.19 14 Bristonwood Wet/Dry Well 5201 Cirque Drive West 400 0.005 0.05 16 Hidden Hills Wet /Dry Well West 29th Street and Morrison Road 375 0.12 0.06 01 Marina 02 Day Island 12 Wastewater Collections Maintenance Pierce County, for pump station data All pump stations are duplex pump systems Average Wet Weather Flows are the average flows taken from station data Except where noted, pump station data is based on pump run time Average Dry Weather Flows are the average flows taken from station data Except where noted, pump station data is based on pump run time Tributary to the City of Tacoma collection system Chambers Creek Tunnel The Chambers Creek Tunnel (Tunnel) is the primary transmission facility for the entire Chambers Creek Regional WWTP sewer service basin Within the University Place West Sub-basin the Tunnel consists of 7,433 December 2010 5-5 Pierce County Unified Sewer Plan Existing Collection System Section lineal feet of 72-inch gravity sewer line that starts at Manhole #12367 and ends just south of Chambers Creek th Road and 75 Street West The Tunnel was constructed as part of the Lakewood/Parkland ULID 73-1 under the Chambers Creek Interceptor project in 1983/1984 A phased rehabilitation of the Tunnel system, beginning with portal installation, was begun in 2000-2001 with project completion planned for 2011 Day Island Trunk The Day Island Trunk consists of 1,691 lineal feet of 15-inch gravity sewer It conveys flows from Day Island, located in the northwest section of the University Place West Sub-basin, to the Marina Pump Station located at th South 19 Street West and Day Island Way This trunk line was constructed as part of the University Place North ULID 70-1 project in 1972/1973 A study has been funded to investigate how best to repair/replace this trunk line Grandview Drive Interceptor The Grandview Drive Interceptor consists of 9,600 lineal feet of 30-inch gravity sewer The interceptor, running th along Grandview Drive from Heitman Way west to 64 Street West, transports flows from the Tacoma Western Slope Basin as well as flows from the western portion of University Place West Sub-basin These flows th discharge into the Chambers Creek Tunnel at the Drop Structure located at 64 Street West and Chambers Creek Road West The interceptor was constructed under the University Place North/Western Slope Turnaround project in 1988/1989 Sunset Drive Trunk The Sunset Drive Trunk consists of 2,710 lineal feet of 15-inch gravity collector sewer and serves the north central portion of the sub-basin The line discharges to the City of Tacoma at 19th Street West and Sunset Drive These flows eventually discharge to the Tacoma Western Slope pump station and flow back through the Grandview Drive interceptor The pipeline was constructed as part of the University Place North ULID 70-1 project in 1972/1973 Tacoma Western Slope Force Main The Tacoma Western Slope Force Main consists of 9,835 lineal feet of 20 and 24-inch force main The force th main runs south from Grandview Drive near 19 Street West to Grandview Drive and Heitman Way West in the University Place West Sub-basin It transports flows from the Tacoma Western Slope Sub-basin and the northern part of the University Place West basin before discharging to the Grandview Drive Interceptor The force main was constructed as part of the University Place North/Western Slope Turnaround project in 1988/1989 December 2010 5-6 Pierce County Unified Sewer Plan Existing Collection System ! 75TH ST W ! ! ! W 72" ! ZIRCON DR SW PS13 PS12 ! ! ! PS64 " 20 PS02 31ST ST W " 24 15 " ! RD PS01 ! 40TH ST W 20" PS66 Chambers Creek Tunnel CHAMBERS CREEK RD W LTER S PS76 ! GRANDVIEW DR W " 72 PS14 Day Island Trunk 64TH ST W S WA Pump Stations 14" and smaller gravity sewers Gravity Transmission Pipelines 15" and greater gravity sewers Transmission Siphon Mains Private Sewer Lines Potential Pierce County Service Area Currently Connected to Other WWTP Other Service Area Tributary to Chambers Creek WWTP Pierce County Sewer Service Area Tributary to the C/O Tacoma, Pierce County, OTHER WWTP Municipal Boundary N State, Federal or County Route NTS Water Features 30" ! ! Tacoma Western Slope Force Main Chambers Creek Regional WWTP Grandview Drive Interceptor Gravity Collectors PS62 Transmission Force Mains 8" and greater force mains SUNSET DR W 6TH AV GRANDVIEW DR W ! Transmission Force Mains 7" and smaller force mains BERS L A N E AM BRIDGEPORT WY W CIRQUE DR W Sunset Drive Trunk Waste Water Treatment Plants ! 44TH ST W PS65 79TH AV W 15" PS70 ! Q UE CIR 35TH ST W ! 27TH ST W PS16 S 19TH ST S JACKSON AV ! DR 67TH AV W 70TH AV W Sewerage Sub-basin Area PS89 W S MILDRED ST EMERSON ST CLAREMONT ST REGENTS BLVD S 12TH ST ALAMEDA AV ° ELECTRON WY Ê Ô S PEARL ST University Place West Sewerage Sub-basin Conveyance System PS31 CH 16 PS74 Figure 5.3-1 DISCLAIMER The map features are approximate and are intended only to provide an indication of said feature Additional areas that have not been mapped may be present This is not a survey Orthophotos and other data may not align The County assumes no liability for variations ascertained by actual survey ALL DATA IS EXPRESSLY PROVIDED ‘AS IS’ AND ‘WITH ALL FAULTS’ The County makes no warranty of fitness for a particular purpose PIERCE COUNTY, WASHINGTON University Place West Sub-Basin Pierce County Unified Sewer Plan Date: December 2010 Section 5.4 University Place East Sub-basin The University Place East Sub-basin consists of approximately 1,700 acres and is located within the City of th University Place and is bordered to the west by Bridgeport Way, to the north by 27 Street West, to the south by Chambers Creek and to the east by Lakewood Drive and Orchard Streets The size and linear footage of mains in this sub-basin are identified in the table below and is graphically represented in Figure 5.4-1 Table 5.4-1 University Place East Sub-basin Existing Conveyance System Interceptor Pipelines Facility Name Size (inches) Length (feet) 67th Avenue Interceptor 15 – 18 7,608 lf Cirque Drive Interceptor 15 – 18 2,190 lf Leach Creek Interceptor 24 – 30 3,404 lf Chambers Creek Tunnel 72 4,526 lf 1,148 lf – 12 87,113 lf Small Collectors Force mains Gravity mains Pump Stations No Name Type Location Capacity in (gpm) AWWF (MGD) ADWF (MGD) 31 Trikalla Self-Priming West 58th Avenue Court and 51st Street 180 0.02 0.02 76 University Woods Submersible 7701 54th Street West 175 0.04 0.03 89 Harvest Ridge Submersible 130 0.03 0.03 63rd Street West Wastewater Collections Maintenance Pierce County, for pump station data All pump stations are duplex pump systems Average Wet Weather Flows are the average flows taken from station data Except where noted, pump station data is based on pump run time Average Dry Weather Flows are the average flows taken from station data Except where noted, pump station data is based on pump run time th 67 Avenue Interceptor th The 67 Avenue Interceptor consists of 7,608 lineal feet of 15 to 18-inch gravity sewer The interceptor begins th at the intersection of 65 Avenue West and Cirque Drive, travels north and west through residential streets and th th th easements to 47 Street West and 67 Avenue West, and then parallels 67 Avenue West where it terminates th th to the west of 38 Street West and 67 Avenue West The pipeline was constructed under the Stonewood developer extension in 1977/1978, the Roman Ridge developer extension in 1978, the Cirque Drive ULID 78-1 th project in 1980/1981, and the 67 Avenue West Interceptor developer extension SWLE #151887 A portion of the interceptor was replaced in 1995 under the Cirque Drive ULID Line Replacement project It serves the northern portion of the sub-basin The flows from this interceptor discharge to the Cirque Drive Interceptor Cirque Drive Interceptor The Cirque Drive Interceptor consists of 2,910 lineal feet of 15 to 18-inch gravity sewer The interceptor begins th at the intersection of Alameda Avenue West and Cirque Drive, travels west along 56 Street West and th th terminates at 54 Street Court West and 67 Avenue West The interceptor collects flows from the central portion of the University Place West sub-basin The pipeline was constructed as part of the Stonewood developer extension in 1977/1978 and flows from the interceptor discharge to the Leach Creek Interceptor December 2010 5-8 Pierce County Unified Sewer Plan Existing Collection System Section Leach Creek Interceptor The Leach Creek Interceptor consists of 3,404 lineal feet of 30-inch pipeline It begins in an easement located east of Bridgeport Way and south of Alameda Avenue, then travels to the north and east where it terminates at th 56 Street West and Alameda Avenue This interceptor is the primary transmission line for the entire sub-basin The pipeline was constructed as part of the Leach Creek Interceptor project in 1987 The flows from the interceptor discharge to the Chambers Creek Tunnel Chambers Creek Tunnel The Chambers Creek Tunnel is the primary transmission facility for the entire Chambers Creek Regional WWTP sewer service basin Within the University Place East Sub-basin the Tunnel consists of 4,526 lineal feet of 72th inch gravity sewer that starts just east of Bridgeport Way near 67 Avenue West, through an easement paralleling Bridgeport Way to the east and terminates at the city limits of the City of University Place and City of Lakewood The Tunnel was constructed as part of the Lakewood/Parkland ULID 73-1 under the Chambers Creek Interceptor project in 1983/1984 In this sub-basin the Tunnel receives flows from the Leach Creek Interceptor A phased rehabilitation for relining the interior surface of the Tunnel began in 2000-2001 with project completion planned for 2011 December 2010 5-9 Pierce County Unified Sewer Plan Existing Collection System Section 5.17.3 Conveyance System Interceptors and force mains form the backbone of the conveyance system They are the trunks of the system into which the wastewater from local collection systems flow An inventory of the existing interceptors, force mains and pump stations in the Pierce County system is found in Table 5.17-1 and illustrated in Figure 5.17-1 Pipe diameter ranges signify that the size of the pipeline changes over the course of its length The table and corresponding figure is identified as a sewer service sub-basin Figure 5.17-1 identifies the general location of each sub-basin Table 5.17-1 Hylebos Sub-basin Existing Conveyance System Interceptor Lines Facility Name Size (inches) Milton-Hylebos Interceptor Length (feet) 15 - 48 15,262 lf Gravity Mains 15 - 18 4,758 lf Siphon mains - 12 276 lf 4-6 7,875 lf - 12 149,439 lf Hylebos ULID Interceptor Small Collectors Force mains Gravity mains Pump Stations No Name Type of Station Location Capacity in (gpm) AWWF (MGD) ADWF (MGD) 03 Hylebos Wet/Dry Well 6200 12th Avenue East 1,250 1.07 0.89 04 Taylor Way Wet/Dry Well 3801 Taylor Way 1,350 1.07 0.9 th 90 Olympic Submersible 388 22nd Avenue Court 91 Emerald Wet/Dry Well 501 5th Avenue 93 Porter Pneumatic Ejector 420 Porter Way 40 250 0.009 0.001 0.02 0.002 40 0.0008 65 94 Birch Pneumatic Ejector 301 19th Avenue 96 Greenwood Self-Priming 2205 6th Avenue 150 0.02 0.02 97 North Surprise Lake Wet/Dry Well w/odor control 2309 Milton Way 300 0.11 0.10 98 South Surprise Lake Wet/Dry Well 2300 Taylor Way 450 0.05 0.04 Sources: General Sewerage Plan Update, 1991 and pump station data All pump stations are duplex pump systems Average Wet Weather Flows are the average flows taken from station data Except where noted pump station data based on pump run time Average Dry Weather Flows are the average flows taken from station data Except where noted pump station data based on pump run time Tributary to the City of Tacoma conveyance system Data not available Pump Station data based on flow meters Milton-Hylebos Interceptor The Milton-Hylebos Interceptor consists of 15,262 lineal feet of 15 to 48-inch gravity sewer and the Hylebos Pump Station The interceptor begins at Taylor Way and East/West Road, then proceeds to the south and east nd where it reaches Pacific Highway East and 62 Avenue East, turns east along Pacific Highway East, crosses th under I-5, then heads to the north and east where it terminates at Kent Street and Avenue East The December 2010 5-48 Pierce County Unified Sewer Plan Existing Collection System Section interceptor was constructed under the Hylebos Interceptor project in 1972 It is a primary transmission main that collects flows from the eastern and southern areas of the basin The flows from the interceptor discharge to the Taylor Way Pump Station Hylebos ULID Interceptor The Hylebos ULID Interceptor consists of 4,758 lineal feet of 15 to 18-inch gravity sewer The interceptor begins th at Pacific Highway East and 70 Avenue East, and then heads north along Pacific Highway East where it terminates just north of Birch Street It collects flows from the central area of the basin The interceptor was constructed under the Hylebos Area/Pacific Highway ULID 82-1 in 1984/1985 The flows from the interceptor discharge to the Milton-Hylebos Interceptor Hylebos Siphon Main The Hylebos Siphon Main is a double barrel siphon that runs under Hylebos Creek and consists of 276 lineal feet of to12-inch sewer line December 2010 5-49 Pierce County Unified Sewer Plan Existing Collection System Hylebos Service Area Sewerage Conveyance System /K g in Sewerage Sub-basin Area Co t un ! y 64TH AV NE ce er Pi E Pump Stations Bo un da Small Collectors 14" and smaller gravity sewers 7" and smaller force mains ry Gravity Transmission Pipelines 15" and greater gravity sewers 58T H AV NE 19T H ST NE Transmission Force Mains 8" and greater force mains Hylebos ULID Interceptor Transmission Siphon Mains 12TH ST NE £ ¤ Private Sewer Lines 509 Contract Service Area ST £ ¤ 99 NE 66T H AV NE 62ND AV NE 7T H Pierce County Sewer Service Area Tributary to the City of Tacoma Đ Ư ă 15" ! PS04 Pierce /King County Boundary PS94! ! PS90 North Surprise Lake Pump Station and Force Main 4TH ST E 66T H AV E PS92 ER W TAYLOR ST Y ! Y NW TO MI L E 18TH ST E Ê Ô 161 20TH ST E 92ND AV E YUMA ST FREEMAN RD E 70TH AV E AV 54TH AV E Y 16TH ST E PS98 Milton-Hylebos Interceptor LL E NTS Water Features RT PS96 ! N 8" ! PO 18" PS03 48" VA 8TH ST E 30 " 15" 8" 114T H AV E 54TH AV E 21" PS97 12TH ST E 20TH ST E ° State, Federal or County Route ! 122ND AV E 18" ! 10TH ST E ! Municipal Boundary PS93 24" 18" ! PS91 H 25T ST E 24TH ST E Figure 5.17-1 DISCLAIMER The map features are approximate and are intended only to provide an indication of said feature Additional areas that have not been mapped may be present This is not a survey Orthophotos and other data may not align The County assumes no liability for variations ascertained by actual survey ALL DATA IS EXPRESSLY PROVIDED ‘AS IS’ AND ‘WITH ALL FAULTS’ The County makes no warranty of fitness for a particular purpose PIERCE COUNTY, WASHINGTON Hylebos Service Area Pierce County Unified Sewer Plan Date: 2010 Date:December March 2010 Section 5.18 Browns Point/Dash Point Service Area The Browns Point/Dash Point Sub-basin is located in unincorporated Pierce County The service area is bounded to the north by City of Federal Way and Lakehaven Utility District, to the east and south by the City of Tacoma, to the west by Puget Sound/Commencement Bay and consists of approximately 674 acres The size and linear footage of mains in this sub-basin are identified in the table below and is graphically represented in Figure 5.18-1 Pierce County serves single family and multifamily residential and small commercial accounts in the Browns Point/Dash Point Service Area 5.18.1 Pierce County Browns Point/Dash Point Wastewater History Several small transmission and treatment capacity contracts between the City of Tacoma and Pierce County for service to the Browns Point/Dash Point service area were established between 1978 and 1988 In 1989 Pierce County and City of Tacoma consolidated all previous capacity agreements for the Browns Point/Dash Point service area into one contract and expanded the coverage of the agreement to include all of unincorporated Pierce County in the area Treatment capacity for this service area is included within the 1986 Capacity Agreement between Pierce County and City of Tacoma 5.18.2 Browns Point/Dash Point Service Area Conveyance System Unincorporated Browns Point/Dash Point is serviced by a series of collector mains and four (4) pump stations Wastewater from Pierce County customers within the Dash Point area is either conveyed through Pierce County sewer lines to a connection point at Lo-Wa-Ma Lane NE or through direct side sewer connections to the City of Tacoma system Within Browns Point, local collector sewers convey flows to either the Tok-A-Lou or Wa-TauGa pump stations Both stations discharge wastewater to a common 10-inch force main which connects to City of Tacoma 18-inch gravity mains south of Slayden Road NE Flows from the entire Browns Point/Dash Point area are conveyed by a City of Tacoma gravity interceptor along Marine View Drive to the City’s Lincoln Avenue system From Lincoln Avenue, flows pass through a series of three pump stations and force mains to a 36-inch force main under the Puyallup River and into the Tacoma Central WWTP Interceptors and force mains form the backbone of the conveyance system They are the trunks of the system into which the wastewater from local collection systems flow An inventory of the existing interceptors, force mains, and pump stations in the Pierce County system is found in Table 5.18-1 and illustrated in Figure 5.18-1 Pipe diameter ranges signify that the size of the pipeline changes of the course of its length The table and corresponding figure is identified as a sewer service sub-basin Figure 5.18-1 identifies the general location of each sub-basin December 2010 5-51 Pierce County Unified Sewer Plan Existing Collection System Section Table 5.18-1 Browns Point/Dash Point Sub-basin Existing Conveyance System Interceptor Lines Facility Name Size (inches) Length (feet) Lower Browns Point Force Main 3,539 lf East Side Drive Force Main 10 1,270 lf Force mains 2-6 1,275 lf Gravity mains 24,394 lf Small Collectors Pump Stations No Name Type Location Capacity in (gpm) AWWF ADWF 35 Tok-A-Lou Wet/Dry Well w/odor control 5200 Tok-A-Lou Avenue NE 450 0.08 0.09 36 Wa-Tau-Ga Wet/Dry Well w/odor control 4500 Wa-Tau-Ga Avenue NE 300 0.07 0.04 37 Klapache Submersible 612 Klapache Avenue NE 25 0.005 0.004 38 Hyada Submersible 5500 Hyada Boulevard NE 25 0.002 0.004 Average Wet Weather Flows are the average flows taken from station data Except where noted pump station data based on pump run time Average Dry Weather Flows are the average flows taken from station data Except where noted pump station data based on pump run time Lower Browns Point Force Main The Lower Browns Point Force Main was constructed as part of the Browns Point Force Main project in 1982/1983 and consists of 3,539 lineal feet of 8-inch force main and serves Lower Browns Point Located at 5200 Tok-A-Lou Avenue NE, Pump Station #35 collects flows from gravity collector mains and routes it through the Lower Browns Point Force Main east along Ton-A-Wan-Da Avenue NE and Pierce Lane NE Flow continues th south along Avenue NE where it connects to the East Side Drive Force Main located at the intersection of Le-Lou-Wa Place and Wa-Tau-Ga Avenue NE East Side Drive Force Main The East Side Drive Force Main was constructed as part of the Browns Point Force Main project in 1982/1983 and consists of 1,270 lineal feet of 10-inch force main This force main collects flows from the entire Browns Point Sub-basin and then conveys that flow along Marine View Drive NE between Le-Lou-Wa Place NE and its point of connection with the Tacoma Central WWTP system south of Slayden Road NE December 2010 5-52 Pierce County Unified Sewer Plan Existing Collection System Browns Point/Dash Point Service Area Conveyance System Sewerage Sub-basin Area ! Small Collectors 14" and smaller gravity sewers 7" and smaller force mains MARKHAM AV NE Gravity Transmission Pipelines 15" and greater gravity sewers T BLVD NE Transmission Force Mains 8" and greater force mains Private Sewer Lines Pierce County Sewer Service Area Tributary to the City of Tacoma ce er Pi EAST SIDE DR 21ST AV NE DASH POIN Pump Stations /K g in Co t un y Bo un Lower Browns Point Force Main da OI ry NO RP NT W Y NE !PS38 D NE LV HYADA B PS35 ! Municipal Boundary ° 51ST ST NE 8" State, Federal or County Route N NTS 10" RD LE-LOU-WA PL NE N E Water Features BROWNS POINT BLVD NORTHSHORE PKWY NE Figure 5.18-1 SL AY DE N LA-HAL-DA AV NE TOK-A-LOU AV NE 8" ! 8" ! PS37 PS36 £ ¤ SA NAS VN UA E 509 East Side Drive Force Main DISCLAIMER The map features are approximate and are intended only to provide an indication of said feature Additional areas that have not been mapped may be present This is not a survey Orthophotos and other data may not align The County assumes no liability for variations ascertained by actual survey ALL DATA IS EXPRESSLY PROVIDED ‘AS IS’ AND ‘WITH ALL FAULTS’ The County makes no warranty of fitness for a particular purpose PIERCE COUNTY, WASHINGTON Browns Point/Dash Point Sub-Basin Pierce County Unified Sewer Plan Date: Date:December December2010 2010 Section 5.19 Chambers Creek Properties Sub-basin The Chambers Creek Properties Sub-basin is located in the Cities of University Place and Lakewood It is bounded to the west by Puget Sound, to the north by the City of University Place, the east by the Cities of University Place and Lakewood, and to the south by the Town of Steilacoom and consists of approximately 930 acres The size and linear footage of mains in this sub-basin is identified in the table below and is graphically represented in Figure 5.19-1 Table 5.19-1 Chambers Creek Properties Sub-basin Existing Conveyance System Interceptor Lines Facility Name Size (inches) Length (feet) Chambers Creek Tunnel 72 1,320 lf CCRWWTP Influent Pipeline 48 535 lf Small Collectors Siphon mains 4–6 Force mains 150 lf Gravity mains 1,166 lf 5,026 lf Wastewater Collections Maintenance, Pierce County, for pump station data Chambers Creek Tunnel and Influent Pipeline The Chambers Creek Tunnel (Tunnel) is the primary transmission facility for the entire Chambers Creek Regional WWTP sewer service basin Within the Chambers Creek Properties Sub-basin the Tunnel consists of 1,320 linear feet of 72-inch gravity sewer line It starts at Manhole #12367 and ends at the Energy Dissipater structure on the WWTP site The Tunnel was constructed as part of the Lakewood/Parkland ULID 73-1 under the Chambers Creek Interceptor project in 1983/1984 CCRWWTP Influent Pipeline The CCRWWTP Influent Pipeline consists of 535 linear feet of 48-inch gravity sewer starting at the Energy Dissipator and ending at the WWTP Headbox The CCRWWTP Influent Pipeline was constructed as part of the Lakewood/Parkland ULID 73-1 under the Chambers Creek Interceptor project in 1983/1984 A rehabilitation and expansion project is currently in design for this tunnel line December 2010 5-54 Pierce County Unified Sewer Plan Existing Collection System PS13 40TH ST W O O CK D W RID DR ON GE DR BRIDGEPORT WY W W EL BE SUNSET DR W ! Chambers Creek Properties Sewerage Sub-basin Conveyance System EMERSON ST 44TH ST W W Sewerage Sub-basin Area CIRQUE DR W CIR Q UE DR GRANDVIEW DR W PS76 Pump Stations Transmission Force Mains 7" and smaller force mains Transmission Force Mains 8" and greater force mains Transmission Siphon Mains 67TH AV W N LA ER CHA M B 64TH ST W S Private Sewer Lines EW Other Service Area Tributary to Chambers Creek WWTP Potential Pierce County Service Area Currently Connected to Other WWTP PS89 CHAMBERS CREEK RD W 72" ! PS65 48" ! ! RC ZI ! PS74 N SW ! Municipal Boundary PS70 PS64 91ST AV SW T SW State, Federal or County Route 75TH ST W PS66 ! PS62 A CO STEIL SW CU ST ER RD 83RD AV SW PS60 PS61 ! ! BRIDGEPORT WY SW L OM B W VD S HIPKINS RD SW 87TH AV SW ! ° N NTS Water Features ! SW IP S R D S W ILL DR ON YX PH S 78TH O DR JOHN DOWER RD W Chambers Creek Regional WWTP STEILACOOM BLVD ! Gravity Transmission Pipelines 15" and greater gravity sewers W ! Chambers Creek Tunnel Chambers Creek Regional WWTP Influent Pipeline Waste Water Treatment Plants Gravity Collectors 14" and smaller gravity sewers 79TH AV W PS14 ! ! Figure 5.19-1 DISCLAIMER The map features are approximate and are intended only to provide an indication of said feature Additional areas that have not been mapped may be present This is not a survey Orthophotos and other data may not align The County assumes no liability for variations ascertained by actual survey ALL DATA IS EXPRESSLY PROVIDED ‘AS IS’ AND ‘WITH ALL FAULTS’ The County makes no warranty of fitness for a particular purpose PIERCE COUNTY, WASHINGTON Chambers Creek Properties Sub-Basin Pierce County Unified Sewer Plan Date: December 2010 Section 5.20 Canyon Sub-basin The Canyon Sub-basin is located in unincorporated Pierce County It is bounded to the west by 50th Avenue East, to the north by SR 512, to the south by Military Road and to the east by 62nd Avenue East It consists of approximately 9,302 acres, of which 3,200 acres is designated as Rural Service Area The size and linear footage of mains in this sub-basin are identified in the table below and are graphically represented in Figure 5.20-1 Table 5.20-1 Canyon Road Sub-basin Existing Conveyance System Interceptor Lines Size (inches) Length (feet) Canyon Road Interceptor 15-20 17,620 lf Canyon Park Force Main 10 1,035 lf – 10 6,557 lf – 12 18,328 lf Facility Name Small Collectors Force mains Gravity mains Pump Stations No 21 33 Name Canyon Park Good Pasture Type Submersible Submersible Capacity in (gpm) AWWF (MGD) ADWF (MGD) th 460 0.10 0.07 Avenue 400 Location 5601 East 112 Street 12601 62 nd Wastewater Collections Maintenance, Pierce County, for pump station data All pump stations are duplex pump stations Average Wet Weather Flows are the average flows taken from station data Except where noted, pump station data is based on pump run time Average Dry Weather Flows are the average flows taken from station data Except where noted, pump station data is based on pump run time Canyon Road Interceptor The Canyon Road Interceptor consists of 17,620 lineal feet of 15 to 21-inch diameter pipe The pipeline begins at the intersection of 160th Street East and Canyon Road, then proceeds north along Canyon and th terminates at the intersection of Canyon and 112 Street East It receives flow the southwest portion of the Brookdale/Golden Given Sub-basin and will eventually extend to serve the entire Canyon Road corridor The pipeline was constructed as part of the Canyon Road Interceptor with flows discharging into the East Basin Interceptor located in the East Basin Sub-basin 5.20 Canyon Park Force Main The Canyon Park Force Main consists of 1,035 linear feet of 10-inch pressure sewer It begins at the Canyon th th th Park Pump Station, located on 112 Street, and continues west on 112 Street to the intersection of 112 and Canyon Road where it discharges into the Canyon Road Interceptor The pump station was constructed by a developer in 1994-1995 December 2010 5-56 Pierce County Unified Sewer Plan Existing Collection System 9TH ST SW FRUITLAND AV E 104TH ST E Ê Ô 512 PS21 ! KD ALE RD E 94TH AV E Transmission Force Mains 7" and smaller force mains Transmission Force Mains 8" and greater force mains Pierce County Rural Sewer Service Area 128TH ST E 74TH AV E Potential Pierce County Service Area Currently Connected to Other WWTP Canyon Road Interceptor Phase 136TH ST E 18" BINGHAM AV E OO Gravity Transmission Pipelines 15" and greater gravity sewers Private Sewer Lines ! CANYON RD E PS33 BR Pump Stations Gravity Collectors 14" and smaller gravity sewers VICKERY AV E 34TH AV E WALLER RD E 120TH ST E Sewerage Sub-basin Area 112TH ST E 62ND AV E 121ST ST E 10" ! 18" 24TH AV E 16" 15" 78TH AV E ! WOODLAND AV E PS77 Canyon Sewerage Sub-basin Conveyance System Municipal Boundary 86TH AV E 144TH ST E ° State, Federal or County Route N NTS Water Features Figure 5.20-1 66TH AV E 152N D ST E PS09 MIL IT ARY RD E 78TH AV E 160TH ST E 156TH ST E 74TH AV E WOODLAND AV E 20" 22ND AV E 38TH AV E 152ND ST E Canyon Road Interceptor Phase ! PS81 DISCLAIMER The map features are approximate and are 152ND ST E intended only to provide an indication of said feature Additional areas that have not been mapped may be present This is not a survey Orthophotos and other data may not align The County assumes no liability for variations ascertained by actual survey ALL DATA IS EXPRESSLY PROVIDED ‘AS IS’ AND ‘WITH ALL FAULTS’ The County makes no warranty of fitness for a particular purpose PIERCE COUNTY, WASHINGTON Canyon Sub-Basin Pierce County Unified Sewer Plan Date: December 2010 Section 5.21 Cascadia Sub-basin The Cascadia Sub-basin is a contract sewer service area located in eastern unincorporated Pierce County It is located south of the City of Bonney Lake on the plateau east of the City of Orting It consists of approximately 3,750 acres all designated Employment Based Planned Community The size and linear footage of mains in this sub-basin is identified in the table below and is graphically represented in Figure 5.21-1 Pierce County operates a LOSS (large on-site septic system) for the Cascadia Planned Community consisting of receiving tanks, an active drainfield, and a reserve drainfield Wastewater drains to a community septic tank where solids settle and are periodically pumped The size and capacity of the system is rated at 100,000 (.1MGD) and is adequate for the previously approved 396 single family homes and a public elementary school The Sewer Service Area for Cascadia is contained within the projects limits Pierce County Public Works and Utilities will maintain the system The Cascadia System will also provide reclaimed water for non-potable uses with the development to reduce water supply demands from the City of Tacoma Future collection and treatment will utilize a Membrane Bioreactor treatment plant to be constructed before flows reach 1MGD with a planned capacity of 8.3MGD - 11.7MGD Table 5.21-1 Cascadia Sub-basin Existing Conveyance System Interceptor Lines Facility Name Cascadia Interceptor Size (inches) Length (feet) 15 – 21 11,536 lf – 12 23,382 lf Small Collectors Gravity mains Wastewater Collections Maintenance, Pierce County, for pump station data Cascadia Interceptor The Cascadia Interceptor consists of 11,536 linear feet of 15- to 21-inch inch gravity sewer The Interceptor begins on an easement approximately 4,800 feet east of Cascadia Road Blvd, then proceeds to the northeast till it reaches Canyon View Blvd, then south to the intersection of Canyon View Blvd and Cascadia Road Blvd, then east along Cascadia to its terminus just east of the intersection of Cascadia Road Blvd and th 198 Ave E This Interceptor was built as a developer extension It serves the northern properties of the Cascadia Master Planned Community The flows currently discharge into a Large On-Site Septic system (LOSS) December 2010 5-58 Pierce County Unified Sewer Plan Existing Collection System MILITARY RD E SO 214TH AV E RHODES LAKE RD E ! PR AI RI E RD Cascadia Service Area Conveyance System E MC C UT CH EO N RD E 120TH ST E UT H RI D GE DR E IE R AI PR ! Waste Water Treatment Plants Gravity Collectors 14" and smaller gravity sewers Gravity Transmission Pipelines 15" and greater gravity sewers Transmission Force Mains 7" and smaller force mains 16 " 18" 20" 21" Contract Service Area Cascadia Phase I Interceptor RIDGEWOOD DR E 198TH AV E 128TH ST E PS164 ! 15" Ê Ô 162 160TH ST E Municipal Boundary 186TH AV E Orting WWTP ! ° State, Federal or County Route N NTS Water Features Figure 5.21-1 CA LI S TO G A ST W DISCLAIMER The map features are approximate and are intended only to provide an indication of said feature Additional areas that have not been mapped may be present This is not a survey Orthophotos and other data may not align The County assumes no liability for variations ascertained by actual survey ALL DATA IS EXPRESSLY PROVIDED ‘AS IS’ AND ‘WITH ALL FAULTS’ The County makes no warranty of fitness for a particular purpose Ê Ô 162 PA TT E RS O N RD E PIERCE COUNTY, WASHINGTON Cascadia Service Area Pierce County Unified Sewer Plan Date: December 2010 Section 5.22 Metering Locations and Flow Monitoring The primary flow monitoring location in the Chambers Creek Basin is at the Chambers Creek Regional Wastewater Treatment Plant Continuous flow recording data is available over the life of the facility, beginning in 1984 Additional flow monitoring stations are found throughout the Chambers Creek Basin and are documented in Table 5.22-1 Table 5.22-1 Existing Flow Monitoring Stations in the Chambers Creek Sewer Service Basin Station Sewer Service Sub-basin Type Location Avondale Pump Station Lakewood East Ultrasonic Meter 6608 Avondale Road West Bridgeport Interceptor Parkland/Brookdale Doppler Bridgeport Way Bridgeport Interceptor Bridgeport/Lakewood Doppler Bridgeport Way Brookdale II Interceptor Parkland Doppler 138th Street East Chambers Creek Regional Wastewater Treatment Plant University Place West Parshall Flume 10311 Chambers Creek Road West Chambers Creek Tunnel University Place Doppler Chambers Creek Road West Community Systems Gravity Main Brookdale/Golden Given Doppler Brookdale Golf Course Custer Road Interceptor Lakewood/DuPont Doppler Custer Road West Drop Structure University Place West Palmer Boles Flume 64th & Chambers Creek Road West East Basin Interceptor East Basin Doppler Old Military Road East Fredrickson Interceptor Frederickson Doppler Canyon Road East Hylebos Pump Station Hylebos Magnetic Meter 62nd Avenue East Lake City Pump Station Lakewood West Magnetic Meter 8803 116th Street SW Leech Creek Interceptor University Place East Doppler 63rd Street West Northwest Landing Pump Station DuPont Magnetic Meter Wharf Road Parkland II Interceptor South Tacoma/Golden Given Doppler Aqueduct Road Parkland II/Midland Interceptor Parkland/South Tacoma/ Golden Given Doppler 108th Street Parkland III Interceptor Parkland Doppler 8th Street Parkland Interceptor Parkland/Spanaway Doppler Spanaway Loop Road Parkland/Brookdale Interceptor Parkland/Rainier Terrace/ Frederickson/Brookdale Doppler Garfield St South Rainier Terrace Interceptor Rainier Terrace Doppler Boeing Access Road Steilacoom Blvd Interceptor South Tacoma Doppler Steilacoom Boulevard SW Steilacoom Pump Station Steilacoom Magnetic Meter Lafayette Street Sunrise Pump Station Rainier Terrace Magnetic Meter 122nd Avenue East Western Slopes Pump Station Western Slopes/University Place Magnetic Meter South 19th Street December 2010 5-60 Pierce County Unified Sewer Plan Existing Collection System Section 5.23 Collection System Operations & Maintenance Collection’s personnel constantly monitor the condition of the sewer system by use of a radio telemetry system and alarm systems Collection’s personnel maintain the system and respond to emergency calls 24 hours a day Increasing urbanization of the Chambers Creek Regional WWTP service area has increased the extent of the collection system along with maintenance efforts The core of the collection system maintenance program is in the established regular program of video capturing of the interiors of pipelines and manholes Video records where infiltration is occurring, where shifts in elevation (bows and sags) have occurred, where extraneous materials, such as grease or construction materials, have blocked pipes or significantly reduced the capacity of a pipe, and where pipelines have collapsed From this information priorities are set for repairs and maintenance activities Information gathered also helps to time system upgrades and capital facilities improvements 5.24 Infiltration and Inflow Collection system capacity is significantly influenced by how much surface water and groundwater enters the system In the Chambers Creek Regional WWTP sewer service basin, infiltration and inflow (I/I) data is collected by the Wastewater Utility and reported to the Department of Ecology (DOE) on an annual basis as required by the Chambers Creek Regional WWTP NPDES permit Previous planning efforts in the County used a 95 gallon per day per capita sewage flow multiplier, which included wastewater and a reasonable allowance for dry weather ground water infiltration This reflects the location of sewer pipelines in areas with perched water tables The effect is that there is always a certain amount of infiltration of groundwater occurring The Chambers Creek collection system generates an average dry weather flow of 15.6MGD The annual average flow at the Chambers Creek Regional WWTP in January 2008 was 19.7MGD The 4.1MGD additional flow is an indicator of both new construction and connections, and of the amount of extraneous water entering the collection system The addition of the Town of Steilacoom to the Chambers Creek Regional WWTP service area increased infiltration and inflow to the Chambers Creek Regional WWTP Average dry weather flows from Steilacoom are approximately 0.5MGD The Steilacoom contract with Pierce County caps peak flows at 2.8 times the average, with the potential consequence of additional charges if peak flows are not contained After completing a 10-year I/I reduction program, the Town of Steilacoom’s system has become less responsive to I/I influences Additional infiltration and inflow is received from the Western Slopes Service Area Flow modeling indicates that as much as 2.0MGD of inflow and infiltration enters the Chambers Creek Regional WWTP system at Tacoma’s pump station on Grandview Drive during storm events Specific information regarding I/I remains unavailable at this time and additional studies may be needed to better quantify this known I/I source I/I driven peak flows consume conveyance system capacity in the existing sewer system Control of inflow sources into the interceptor system paralleling Clover Creek is important to prevent surcharging This may require coordination of surface drainage and flood control activities to prevent extraneous flows from entering the sanitary sewer system 5.25 Capacity Restrictions Identification of capacity restrictions is driven by a State of Washington regulation that requires planning for additional conveyance capacity when peak flows reach 85 percent of the peak flow a pipeline was designed to carry Sewer systems are designed and constructed to totally contain wastewater Based on July 2009 flow measurements December 2010 5-61 Pierce County Unified Sewer Plan Existing Collection System Section 5.26 Well-Head Protection A GIS analysis of sewer lines and Group A public wells identified three wells within 100 feet of a Pierce County sewer line in the Chambers Creek – Clover Creek Drainage Basin Design engineers and construction managers indicated that in these instances materials such as concrete, ductile iron, or PVC pipe sleeving have been used as recommended by the Washington State Department of Health and industry construction standards to maintain separation Table 5.26-1 Group A Wells within 100 feet of Pierce County Sewer Service Facilities System Name TPCHD No WSDOE No Parkland Light & Water Company 114 ACW449 Parkland Light & Water Company 242 ABS619 Tacoma Sportsmen’s Club 426 ACA863 Location/Coordinates Parkland Area Long.: –122 26.36.1 Lat.: 47 6.37060 Parkland Area Long.: -122 26 36.3 Lat.: 47 6.66322 166th Long.:-122 20 45.2 Lat.:47 16.9729 Pipe Material Concrete/PVC Concrete/PVC Ductile Iron Source: Pierce County Geographic Information System 5.27 Large On-Site Sewer Systems (LOSS) Maintained by Pierce County For all LOSS systems, maintenance personnel complete routine maintenance of pump stations every other week Septic tanks are pumped at least once a year The 2001 Unified Sewer Plan identified four community systems under the maintenance of the Utility, Cypress Green, Rainier Meadows, Etloh, and Tahoma Vista Both Rainier Meadows and Tahoma Vista were connected to the sewer system in 2006, leaving Cypress Green and Etloh as the remaining community systems that the Utility maintains 5.27.1 Cypress Green Cypress Green (Meadowbrook Apartments) is a 48-unit apartment building in American Lake Gardens (City of Lakewood) Pierce County Sewer Utility has maintained the community on-site sewer system since 1977.A planned extension of the sewer collection system by the City of Lakewood in 2009-2010 to the American Lake Gardens area will connect the Cypress Green community system to the sanitary sewer system leaving Etloh and Cascadia as the last existing community systems under Pierce County maintenance Table 5.27-1 Cypress Green On-Site Sewer System Pump Station #18 7511-146th Street SW Two (2) 100 gpm effluent pumps 5.27.2 Cascadia/Tehaleh Master Planned Community Since 2008 Pierce County has operated a LOSS consisting of receiving tanks, an active drainfield, and a reserve drainfield, to service 396 single family residences and one elementary school in the Cascadia/Tehaleh Master Planned Community This contract service area known as the Cascadia Sub-basin is referenced in Section 5.21 The size and linear footage of mains in this sub-basin is identified in Table 5.21-1 and is graphically represented in Figure 5.21-1 Future collection and treatment will utilize a Membrane Bioreactor treatment plant to be constructed before flows reach 1MGD with a planned capacity of 8.3MGD - 11.7MGD December 2010 5-62 Pierce County Unified Sewer Plan Existing Collection System ... 0.01 57 Nottingham Wet/Dry Well 98 25 Newgrove Avenue SW 155 0.01 0.01 58 Interlaaken Wet/Dry Well 10200 Short Lane SW 1 75 0.02 0.02 59 Country Club Submersible 12 851 Country Club Drive SW 355 0.02... Barksdale and Santa Cruz 1 25 -5 -5 Burnside Submersible 111 Burnside Place 200 -5 -5 28 Mounts Road Submersible 36 25 Hoffman Hill 250 -5 -5 34 Bell Marsh Submersible 13 25 DuPont Steilacoom Highway... 18 5, 441 lf Gem Heights Trunk 18 4,338 lf Graham Trunk 18 6,269 lf 15 - 18 6, 951 lf 15 3, 456 lf 18 1,3 85 lf 16 53 0 lf Force Main 1,324 lf Gravity 15 4,3 25 lf Hansen Estates Force Main 1, 150 lf