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City of Tacoma Regional Stormwater Facility Plan: ATTACHMENT 1: FLETT CREEK WATERSHED

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City of Tacoma Regional Stormwater Facility Plan: ATTACHMENT 1: FLETT CREEK WATERSHED City of Tacoma Regional Stormwater Facility Plan: ATTACHMENT 1: FLETT CREEK WATERSHED Aerial Photo of Flett Holding Ponds and Flett Wetlands Gravel Pit Stormwater Regional Facility and Outlet Structure June 2016 Prepared by City of Tacoma Environmental Services Department Science and Engineering Division, Environmental Programs Group TABLE OF CONTENTS Abstract...................................................................................................................................... 1 Flett Creek Watershed ............................................................................................................... 2 1.1 Overview ....................................................................................................................... 2 1.2 The Flett Creek Watershed Stormwater Collection System ........................................... 2 1.2.1 Flett Creek Watershed – Eastern Portion .......................................................... 2 1.2.2 Flett Creek Watershed – Western Portion.......................................................... 3 1.2.3 Flett Creek Holding Basins ................................................................................ 4 1.3 South Tacoma Groundwater Protection District ............................................................. 4 Receiving Waterbodies .............................................................................................................11 2.1 Overview ......................................................................................................................11 2.2 Water Quality Standards .............................................................................................11 2.3 ESA-Listed Fish Species Critical Habitat .....................................................................12 Gravel Pit Regional Stormwater Flow Control Facility ...............................................................15 3.1 Expansion of the Gravel Pit Holding Basin ...................................................................15 3.1.1 Life Cycle Costs................................................................................................15 3.1.2 WWHM Evaluation of Existing and Proposed Conditions ..................................18 3.3 Contributing Basin Calculations ....................................................................................18 3.3 Payment In-Lieu-Of Construction System Development Charge Determination ...........22 3.4 Participation in the Payment In-Lieu-Of Construction Program .....................................23 LIST OF TABLES AND FIGURES Table 2-1 Water Quality Standards Table 2-2 WRIA #12 Natural Fish Population Table 3-1 Life Cycle Costs for Regional Facility Table 3-2 WWHM Model Results, Forested to Existing Conditions- Current and Proposed Table 3-3 WHMM Outlet Structure Table 3-4 Net Capacity Credit Available for Payment In-Lieu-Of Construction Program Table 3-5 System Development Charge and Net Capacity Credit Available Figure 1-1 City of Tacoma Watersheds Figure 1-2 Flett Creek Watershed 2015 Impervious Surface Coverage Figure 1-3 Flett Creek System Figure 1-4 South Tacoma Groundwater Protection District Figure 1-5 Flett Creek Watershed Contribution Areas Figure 3-1 Existing Conditions – June 2016 Figure 3-2 Proposed Conditions – June 2016 City of Tacoma Regional Stormwater Facility Plan i Attachment I Abstract The City is expanding the holding capacity of the existing Gravel Pit Regional Stormwater Facility. The expansion will be enrolled in the Payment In-Lieu-of Construction Program and will allow the City to accelerate environmental improvements in the Flett Creek Watershed and to Flett Creek. New development and redevelopment projects within the Flett Creek Watershed will have the option of participating in the Payment In-Lieu-Of Construction Program by paying a system development charge in-lieu-of providing individual site-specific stormwater flow control best management practices in order to meet Minimum Requirement (MR) #7. Public and private projects are eligible for participation in the program. This is a voluntary program. The system development charge and available capacity to be included in the program is: System Development Charge $0.97 ($/square feet of mitigated area required) Net Capacity Credit Available (acres) 68.82 Total Impervious Surface Area Available (acres) 58.5 Total Lawn/Landscaped Area Available (acres) 10.32 The system development charge is based upon an assumption that the drainage area will be fully built out to 85% impervious surface coverage. At 85% impervious surface coverage, the mitigation area available is a total of 68.82 acres of which 58.5 acres is considered impervious surface and 10.32 acres is considered lawn/landscaped. Projects must meet all Minimum Requirements applicable to the project even if the system development charge will be used to mitigate for MR #7. A Stormwater Site Plan must be submitted for review and approval – the project proponent may state that they are utilizing the Gravel Pit Regional Stormwater Facility to meet the intent of MR #7. City of Tacoma Regional Stormwater Facility Plan 1 Attachment I Flett Creek Watershed 1.1 Overview The Flett Creek Watershed is approximately 7,126 acres and is the second largest watershed in the City (see Figure 1-1). The Flett Creek Watershed is located in the Chambers-Clover Water Resource Inventory Area (WRIA#12). Stormwater runoff from the entire watershed ultimately flows into the Flett Creek Holding Basins and discharges from a single point to the Flett Dairy Wetlands and Flett Creek. The area is predominately residential with commercial and light industrial uses in localized areas. The watershed is 43 percent impervious as shown in Figure 1-2. Flett Creek Watershed is bordered by the Thea Foss Watershed on the east, Leach Creek Watershed on the west and Pierce County to the south. The watershed includes the Hosmer System, the Flett Creek Holding Ponds, Snake Lake, Wapato Lake, portions of Interstate 5, the South Tacoma Groundwater Protection District and the former South Tacoma Channel Superfund Site. 1.2 The Flett Creek Watershed Stormwater Collection System All 7,126 acres of the watershed drain into the Flett Creek Holding Basins which are pumped from a single pump station into the Flett Dairy Wetlands and Flett Creek. For the purpose of describing flow through the Flett Creek Watershed, the watershed is divided into an eastern and western portion. Both portions ultimately discharge to Flett Creek which is located outside the City of Tacoma city limits. Stormwater is conveyed through the watershed primarily by underground conveyance systems though some localized ditch systems exist (see Figure 1-3). There are no streams or creeks located in the Flett Creek Watershed in the city limits. 1.2.1 Flett Creek Watershed – Eastern Portion Stormwater runoff from the eastern portion of the watershed flows through a series of holding ponds formerly known as the Hosmer System (See Figure 1-5). The Hosmer System consists of the Hosmer Holding Basin, the Ward’s Lake Holding Basin, and the Gravel Pit Holding Basin – each described in more detail below. The drainage area for the Hosmer system is 3,1138.29 acres of which 41% is impervious surface. Stormwater from the drainage area is conveyed to the Hosmer Holding Basin by an underground conveyance system. Water from the Hosmer Holding Basin is conveyed via gravity flow to Ward’s Lake. Water from Ward’s Lake is conveyed via gravity flow to the Gravel Pit Holding Basin where water is then conveyed via gravity flow to the Flett Creek Holding Ponds. Water flow out of the Gravel Pit is controlled by a storm gate maintained at 70% open. In addition to Tacoma’s flow contribution, approximately 800 acres of Pierce County stormwater runoff flows into the Hosmer Holding Basin. A portion of stormwater runoff from Lakewood and WSDOT right-of-way flows into Ward’s Lake. A portion of stormwater runoff from the City of Lakewood also enters the Gravel Pit Holding Basin. Wapato Lake is also located in the eastern portion of the Flett Creek Watershed. Stormwater contributions to Wapato Lake are limited to a small drainage basin in the vicinity of the lake. Currently stormwater enters the north cell of Wapato Lake and exits via the bypass pipe for conveyance to Ward’s Lake. During intense storm events, stormwater in the north cell will overflow into the main lake; otherwise stormwater is generally bypassed around the lake. Water flowing from Wapato Lake enters Ward’s Lake Holding Basin via a gravity stormwater system. City of Tacoma Regional Stormwater Facility Plan 2 Attachment I 1.2.1.1 Hosmer Holding Basin The Hosmer Holding Basin consists of two cells that receive stormwater runoff from commercial and residential areas to the north, south, and east of the basin. 1.2.1.2 Ward’s Lake The Ward’s Lake is a single cell basin which receives water from the Hosmer Holding Basin, WSDOT right-of-way, and Wapato Lake. Water exits the holding basin through a pair of gates, one designed for normal flow conditions and one designed as an emergency overflow. 1.2.1.3 Gravel Pit Regional Stormwater Facility The Gravel Pit Regional Stormwater Facility (formerly known as the Gravel Pit Holding Basin) was originally an open pit gravel extraction facility. Gravel was extracted in the 1950s for use in road construction. In 1959, when gravel mining ceased, the City began using the gravel pit as a regional stormwater detention facility. The Gravel Pit is a single cell holding
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