CORRESPONDENCE_4/7/22 [REV] APPENDICES W/FIRE PERMIT

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COMPOST FACILITY STORM WATER IMPROVEMNTS 1-1 SECTION 1 Introduction The Forward Landfill is an active, permitted Class II and Class III disposal facility that is owned and operated by Forward, Inc. (Forward), a subsidiary of Republic Services. The landfill is located approximately seven (7) miles southeast of the City of Stockton in San Joaquin County. This report presents the design and construction documents for the storm water improvements at the Forward Landfill Compost Facility. The Compost Facility is located south of the South Fork of South LittleJohns Creek. The location of the Compost Facility is shown on the Site Plan (see the Construction Drawings in Appendix A). The design and construction documents for the Compost Facility Storm Water Improvements were prepared in accordance with the site’s Waste Discharge Requirements (WDR Order No. R5-2014- 0006) and applicable State and Federal regulations. The applicable state regulations include California Code of Regulations (CCR), Title 27, Division 2 (Title 27). The federal regulations are incorporated in 40 Code of Federal Regulations (CFR), Parts 257 and 258 (Subtitle D). The State Water Resources Control Board (SWRCB) Draft General Waste Discharge Requirements for Composting Operations (May 2014) were also reviewed and certain pertinent features from these draft regulations were incorporated. Some of the provisions of particular importance regarding the design based on the site’s WDRs include: • The retention basin shall be equipped with a synthetic liner, shall maintain a minimum two feet of freeboard and shall be designed and operated to minimize the downward percolation of constituents; • The retention basin shall be designed to accommodate all runoff and direct precipitation from a 25-year, 24-hour storm and maintain two feet of freeboard; and • The Discharger shall maintain an effective run-on control system and for the composting area a run-off control system designed to withstand the maximum peak flow from a 25-year, 10-minute storm. The SWRCB’s draft general WDRs vary slightly from the site’s recently issued WDRS and include run-on and run-off control from a maximum probable 25-year, 24 hour peak storm event, a wastewater handling system to manage wastewater from a minimum 25-year return annual total precipitation value distributed monthly, a retention basin lined with a synthetic liner underlain by one- foot of compacted clay or a geosynthetic clay liner (GCL), and a pan lysimeter under the low point of the retention basin. The Compost Facility storm water improvements incorporate these additional measures.