CHAPTER 4 EXISTING STORMWATER MANAGEMENT SYSTEM
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1 CHAPTER 4 EXISTING STORMWATER MANAGEMENT SYSTEM INTRODUCTION The analysis of stormwater management system performance requires knowledge of the system components. This chapter presents a description of the existing stormwater management facilities within the UGA. Most of the stormwater runoff in the UGA infiltrates before reaching a conveyance system. The storm drainage collection and conveyance system consists of typical components such as catch basins, pipes, open ditches, and, in the Port Hadlock Core, concrete curbs and gutters. The stormwater management system also includes facilities to treat and infiltrate stormwater runoff. Treatment systems include biofiltration swales, filter strips, and an oil/water separator vault. Infiltration facilities include drywells, ponds, trenches, and chambers, EXISTING STORMWATER DRAINAGE INVENTORY The evaluation of the UGA s stormwater management facilities begins with the establishment of an inventory of the existing system s components. Jefferson County Public Works Department developed an inventory of public and private stormwater management facilities. The inventory was compiled from County Road project plans, the County Road Information System (CRIS), County development review records, field inspections, and aerial surveying. The inventory includes detailed information for the Port Hadlock Core storm sewer system and the Irondale Road drainage from SR19 to 4 th Avenue. This information includes pipe diameter, length, slope, and inverts, elevations of catch basins, and, for Irondale Road, the location and design of treatment swales and infiltration trenches. A summary of facilities is included in Tables 4-1 and 4-2. The existing impervious surfaces and stormwater management facilities are depicted on Figure 4-2. Jefferson County 4-1 Irondale & Port Hadlock UGA Stormwater Management Plan
2 TABLE 4-1 Urban Growth Area Inventory of Roadway Stormwater Management Facilities Road SWM Facility 1 st Street (638209) MP 0.01 Right and Left: Catch basins and infiltration trenches 3 rd Street (639809) MP 0.02 Left: Dry well MP 0.49 Left: Dry well 4 th Avenue (672009) Tilt up curb conveys runoff from 4 th Avenue to Moore Street with outfall to Port Townsend Bay (Not in CRIS.) Cedar Avenue (637109) MP Left: Catch basin/dry 1 st Street intersection MP Right: Catch basin/dry 1 st Street intersection MP Left: Catch basin/dry 2 nd Street intersection MP Right: Catch basin/dry 2 nd Street intersection MP Left: Catch basin/dry well MP Right: Catch basin/dry well MP Left: Catch basin/dry Montgomery Street MP Right: Catch basin/dry Montgomery Street MP Right: Catch basin/dry Montgomery Street Curtiss Street (651309) MP 0.12 Left: Dry well D Street (658909) MP 0.28 Right: Dry well W. Hayden Street MP 0.06: Catch basin/dry well on road end (642509) Lower Hadlock Road MP 0.189: Cross culvert conveys runoff from Hadlock storm (652509) sewer system to Lower Hadlock Lagoon. (CRIS/ /Culverts) Irondale Road (933507) MP Right: 3 catch basins and conveyance to ditch. (Not in CRIS) Irondale Road (933507) MP (Chimacum Creek crossing): Collection, storm drain, bioswale, and infiltration systems on east and west sides of the Creek. (Not in CRIS) Irondale Road (933507) MP 0.76: Catch basin, cross culvert, and storm drain on Irondale Road to infiltration trench on west side of 4 th Avenue. (Not in CRIS) Jefferson Place (533609) MP 0.04 Left: Catch basin/dry wells MP 0.04 Right: Catch basin/dry wells South Maple Street MP 0.18 Right: Dry well (638009) MP 0.19 Left: Catch basin and infiltration trench Masonic Hall Road (645109) MP 0.22: Cross culvert (CRIS/ /Culverts) MP 0.09 Right: Dry well MP 0.31 Left: Dry well 4-2 Jefferson County Irondale & Port Hadlock UGA Stormwater Management Plan
3 TABLE 4-1 (continued) Urban Growth Area Inventory of Roadway Stormwater Management Facilities Road East Moore Street (677709) Port Hadlock storm sewer system East Price Street (667009) Quimper Lane (533509) SR 116 SWM Facility MP Right and Left: Tilt up curb (Not in CRIS) MP 0.54: Catch basin, cross culvert, ditch, cross culvert, and ditch to Port Townsend Bay (CRIS/ /Culverts) Curbs and gutters; catch basins, conveyance, cross culvert on Lower Hadlock Road; outfall to Lower Hadlock Lagoon (Not in CRIS) MP 0.21 Right and Left: MP 0.20 Right: Catch basin / Dry well MP 0.19 Left: Catch basin / Dry well MP 0.36 Right (Chimacum Creek Drive intersection): Catch basin with outfall to West through +/-150 CMP (Not in CRIS) MP +/-1.6: Cross culvert and curb cut discharges road runoff to Lower Hadlock Lagoon (Not in CRIS) Jefferson County 4-3 Irondale & Port Hadlock UGA Stormwater Management Plan
4 TABLE 4-2 Carl s Building Supply Lawrence Johnson 8265 Flagler Road Nordland, WA Rhody Drive Chalmers 2 nd, Block 34, Lots 1-13 and SE, S3, T 29 N, R 1 W buildings,, and storage yard Chimacum Creek Elementary Chimacum School District PO Box 278 Chimacum, WA Ness Corner Road SW, S 2, T 29 N, R 1 W School Infiltration pond Circle and Square Auto Repair Reto Fili Rhody Drive Rhody Drive Chalmers 2 nd, Block 34, Parcel 2 SE, S 3, T 29 N, R1W Automotive repair and Spill control O/W separator, bioswale, infiltration pond Ding Doctor Windshield Repair Scott Broderson / Chris King PO Box Rhody Drive Chalmers No. 2, Lots 5-7, Blk 29, SE, S 3, T 29 N, R 1 W Infiltrator units Ferino s Pizza Scott Browning 230 Ridgeview 846 Ness Corner Road Charawell Short Plat, Lot 2, SE, S2, T 29 N, R 1 W Vegetated filter strip; infiltration swale 4-4 Jefferson County Irondale & Port Hadlock UGA Stormwater Management Plan
5 TABLE 4-2 (continued) Groves Glass PO Box Rhody Drive Chalmers 2 nd, Block 17, Lots S 3, T 29 N, R 1 W Infiltration trenches John Gunning 1210 F Street Rhody Drive Chalmers 2 nd, Block 36, Lots SE, S3, T 29 N, R 1 W Hadlock Building Supply L&J Enterprises PO Box 869 Hadlock Building Supply Parking L&J Enterprises PO Box 869 Jefferson County Public Works Road maintenance shop PO Box 2080 Jefferson County Sheriff Jail and Sheriff s Office 81 Elkins Road 901 Ness Corner Road Tax 45 SE, S2, T 29 N, R 1 W Ness Corner Road Tax 89 and 90 SE, S2, T 29 N, R 1 W 371 Chimacum Road (JCPWD) 81 Elkins Road (JCSO) NE, S 11, T29 N, R 1 W buildings,, and storage yard Parking and 2 future commercial building County government facilities Infiltrator units Drywells (JCPWD) Catch basins and infiltration pond (Jail) Catch basins, bioswale, and infiltration pond (JCSO) 4-5 Jefferson County Irondale & Port Hadlock UGA Stormwater Management Plan
6 TABLE 4-2 (continued) Jefferson County Library 620 Cedar Avenue 620 Cedar Avenue Tax 160 S 2, T29 N, R1 W Library and Roof and lot runoff to drywells. Daniel Lockhart 150 Lower Adelma Beach Rd. NAPA Auto Parts Store Steve St. Clair 2321 Sims Way Rhody Drive SE SW, S 34, T 30 N, R 1 W Rhody Drive Seventh Avenue Acre Tracts Lots 152, 153, 159, and 160 NE, S 3, T 29 N, R 1 W buildings and ; vehicle storage buildings and with spill control T s Collection, conveyance, bioswales, and infiltration trenches Ness Storage Richard Bonds c/o Hadlock Realty 211 Chimacum Road 51 Ness Corner Road Chalmers 2 nd, Block 35, Lots 8-11, 16, SE, S 3, T 29 N, R 1 W Storage buildings Infiltration trenches Olympic Greens Subdivision Olympic Greens LLC PO Box 2148 Orcutt, CA Christney Road SE, S 2, T 29 N, R 1 W Residential subdivision and private roads Infiltration trenches 4-6 Jefferson County Irondale & Port Hadlock UGA Stormwater Management Plan
7 TABLE 4-2 (continued) Peninsula Video Craig Smith PO Box 590 Indianola, WA Ness Corner Road Charawell Short Plat, Lot 1 SE, S2, T 29 N, R 1 W Vegetated filter strip; infiltration swale Martin Peterson 410 E. Marrowstone Road Nordland, WA Rhody Drive Chalmers 2 nd, Block 35, Lots SE, S 3, T 29 N, R1W Infiltration pond Shold Business Park WWW Enterprises PO Box 521 Chimacum, WA 207 Patison Street Tax 3, 38 NE, S 3, T 29 N, R 1 W Infiltration chambers Tri-Area Center Jeanne Dirksen 27 Colwell Street Sorenson Brothers Partnership PO Box 634 Chimacum, WA Sorenson Brothers Partnership PO Box 634 Chimacum, WA Colwell Street Chalmers 2 nd,, Block 23, Lots Colwell Street Chalmers 2 nd,, Block 23, Lots SR19/Colwell Street Chalmers 2 nd,, Block 26, Lots 8-9 building and building and building and 4-7 Jefferson County Irondale & Port Hadlock UGA Stormwater Management Plan
8 TABLE 4-2 (continued) Enclume Inc. 24 Colwell Street Chalmers 2 nd,, Block 26, Lot 7 building and RC Investors 24 Colwell Street US Post Office Port Hadlock Port Hadlock LLC PO Box 245 Gig Harbor, WA Colwell Street Chalmers 2 nd,, Block 26, Lots Matheson Street Matheson Short Plat, Lot B SE, S 2, T29 N, R 1 W Light manufacturing and Post office and Infiltration pond Dr. Don Young, dental office 630 Jolie Way 906 Ness Corner Road Charawell Short Plat, Lot 4, SE, S 2, T29 N, R 1 W Dental office and Infiltration system 4-8 Jefferson County Irondale & Port Hadlock UGA Stormwater Management Plan
9 Information from the system inventory was used to numerically model the flow of stormwater through the drainage system. From the information generated by the hydraulic model, conveyance systems can be planned to accommodate storm runoff for any specific design storm. The model can also identify current system deficiencies from which a capital improvement plan can be developed. The improvements can be installed as part of the Stormwater Management Plan or as part of developer improvements. The model results indicate the proper size of the storm pipe to be installed to allow for conveyance of stormwater runoff. For example, the model may indicate that a system component such as a pipe may be satisfactory for the conveyance of runoff from a 2-year storm event, but may not be able to convey runoff from a 10-year storm event. At such time that the County has funding available, or as part of mitigation for a new development, a design can then be completed based upon the model results and the improvement constructed. The map of existing impervious surfaces and stormwater management facilities in Figure 4-2 was used to develop the modeling conducted for this Plan. It will provide a tool for developing a program to track facilities maintenance, repair, and replacement. It will also be the basis for maintaining an inventory of impervious surface and stormwater management facilities that are developed in the future. BASIN DESCRIPTIONS Most of the Irondale & Port Hadlock UGA is on flat to moderate slopes draining generally north and east. Infiltration in the area is typically good, but varies due to the groundwater table and soils. No catastrophic floods have occurred in recent history. For the purpose of isolating and identifying potential deficiencies within the conveyance system, the Irondale & Port Hadlock UGA was divided into 43 separate drainage basins as shown in Figure 4-1. There are two outfalls to Port Townsend Bay in the UGA. They convey runoff collected by the Port Hadlock Core storm sewer system and road drainage from Moore Street in Irondale. Jefferson County 4-9 Irondale & Port Hadlock UGA Stormwater Management Plan
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