CORRESPONDENCE_2018-2020 - Laserfiche WebLink

Home Browse Search

f •� Moil, LCRS Design - Area 213 Foothill Sanitary Landfill Geo -Logic Associates, Inc. (GLA) has prepared this report for the San Joaquin County Department of Public Works (County) that summarizes the design of the leachate collection and removal system (LCRS) for Area 213 at the Foothill Sanitary Landfill facility (FSLF) in Linden, California, which incorporates an engineered alternative design (EAD) for the LCRS base liner blanket leachate collector. This report describes both the proposed LCRS for the side slopes and base of Area 213, and further demonstrates through calculation, how the proposed EAD meets the requirements of state and federal requirements for such. The FSLF is a Class III facility as defined by Title 27 of the California Code of Regulations (CCR) that is located approximately 15 miles east of the Stockton, California. The proposed Area 213 encompasses an approximate 25 -acre plan area and is south of Area 2A and Area 1, as shown in Figure A. 2.0 REGULATORY REQUIREMENTS 2.1 Federal Requirements Minimum federal requirements for landfill LCRS design is described in Subtitle D of the Code of Federal Regulations (CFR), which requires that new municipal solid waste (MSW) units and lateral expansions be constructed with a leachate collection system that is designed and constructed to maintain less than 12 inches of leachate head over the liner. 2.2 State Requirements Minimum State of California requirements for LCRS design are contained in Section 20340(b) of Title 27 of the California Code of Regulations (CCR). It states that "...where an LCRS is used, it shall be installed immediately above the liner..., and shall be designed, constructed, maintained, and operated to collect and remove twice the maximum anticipated daily volume of leachate from the Unit." Furthermore, the California Regional Water Quality Control Board, Central Valley Region (RWQCB) discusses site specific liner requirements, including the base LCRS construction, within the FSLF's Waste Discharge Requirements (WDR) No. R5-2015-0058 under the "Landfill Design and Construction" section, order numbers 74. Order number 74 describes the currently approved EAD for the FSLF base liner system as consisting of, from bottom to top: • 1 -foot -thick prepared foundation layer • Geosynthetic clay liner (GCL) • 60 -mil high density polyethylene (HDPE) geomembrane liner • LCRS consisting of 4 -inch diameter HDPE collection piping in drainage troughs within a 9 - inch -thick blanket gravel drainage layer (GDL) • Geotextile • 2 -foot -thick soil operations layer Project No. AU 17.1254 1 LCRS Design 1 May 2018