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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -28- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY 5. The design and construction of all landfill module LCRS and containment system components shall incorporate adequate factors of safety to handle the increased vertical loads associated with vertical expansion. Consistent with geotechnical analysis of the proposed EAD (see Finding 58), the construction specifications for future modules shall incorporate the following recommendations to prevent damage to the LCRS and liner from vertical loading: a. Protection From Liner Puncture -- Use of 3/8-inch diameter, rounded gravel in the LCRS blanket layer and/or cushion with geotextile (16-oz/yd2). b. Protection From LCRS Pipe Failure (e.g., buckling, deflection, rupture) -- Use thicker (i.e., 13.5 SDR) perforated HDPE pipe in French drain. Also use select gravel bedding and backfill in LCRS troughs Construction specifications in addition to, or in lieu of, the above may be incorporated into the design provided that the Discharger demonstrates, to the satisfaction of the Executive Officer, that the proposed construction specifications will not result in (1) Reduced factors of safety and/or protection associated with the design; and (2) Any change inconsistent or incompatible with Construction Specifications D.1 through D.4 above. 6. The Discharger shall, at least 90 days prior to construction of new modules or units, submit for Executive Officer review and approval the following: a. A construction design report, including plans, drawings and a construction quality assurance (CQA) plan per Section 20324 of Title 27; b. A geotechnical evaluation of the area soils, evaluating their use as the foundation layer; c. A proposed unsaturated zone monitoring system, which is demonstrated to remain effective throughout the active life, closure, and postclosure maintenance periods of the Unit, which shall be installed beneath the composite liner system in accordance with Title 27, Section 20415(d); and d. A revised groundwater detection monitoring program, as necessary, to monitor the new module so as to maintain compliance with Title 27. 7. Construction shall proceed only after all applicable CQA plans have been approved by Executive Officer. 8. Following the completion of construction of a lateral expansion of a unit, and prior to discharge onto the newly constructed liner system, final documentation required under Section 20324(d)(1)(C) of Title 27 shall be submitted to the Executive Officer for review and approval. Such documentation shall contain sufficient information and test results to verify that construction was in