COMPLIANCE INFO_1993-2007 - Laserfiche WebLink

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Am MW W.- kog KLEINFELDER adjacent drainage swale. Presently,the pit has the following capacity(this capacity will probably be reduced in the detailed design due to loss of volume caused by the soil face stabilization system): Water Depth Volume In Pit feet (gallons) 1 56,947 3 160 590 5 363,600 7 556,106 10 899,7081 Over the lined area of 6.2 acres, each inch of rainfall will generate approximately 168,000 gallons of runoff that will be contained in the pit area (assuming no infiltration). In its present configuration, the pit could contain within the lined area (up to an elevation of 0 feet MSL) approximately 5.4 inches of rainfall. With three feet of freeboard, the pit could hold approximately 3.3 inches of rainfall. Comparing this capacity with the daily, monthly and yearly rainfall data for storms of varying return periods, it is clear that the lined portion of the pit will be able to contain runoff from most daily storms but over the period of a year, pumping from the pit will be required on a periodic basis. Evaporation can be expected to remove a portion of the stormwater form the impoundment but due to the anticipated depth of water (likely in excess of the 47.2 inches estimate) evaporation alone will not be sufficient to control water levels in the pit area. 3. Page 21, paragraph 1 - revise Final Plans to state that "final design and construction quality assurance (CQA) plans and specifications shall be submitted to the reviewing agencies for approval. " Section II.2 of the Closure Plan shall now read: Upon closure plan approval, Cove Contractors will prepare a detailed design for the closure and incorporate that design into a bid package for construction activities associated with the closure activities. This bid package will include specifications, plans, and a Construction Quality Assurance(CQA)plan. A general outline of the CQA is presented in Table 1. Before circulation to bidders,the bid package will be submitted to the reviewing agencies for approval. 4. Page 27, Section I11.2.4 (Landfill Gas Monitoring) -Final plans state in paragraph 2 that if Phase 1 gas monitoring shows "significant levels" of methane gas, a Phase 2 program will be implemented. "Significant Levels" should be defined. A more detailed proposed Phase 2 program should be submitted for approval, if necessary, with the Phase I final report. In addition, if Phase 2 is necessary, monitoring of trace gases should be conducted pursuant to 14 CCR 17783.9. For the purpose of Phase 1 gas monitoring, "significant level" is defined as a concentration of methane exceeding 5%. If Phase 1 monitoring indicates that Phase 2 gas monitoring should be implemented, a detailed description of the Phase 2 program will be included with the Phase 1 final report. The Phase 2 program will include monitoring for trace gases using EPA Method TO-14. 5. Page 15, paragraph 5 - Given the discussion of compressibility of auto shredder residue on page 16, paragraph 3, relative compaction of 90%for the foundation layer may be difficult to attain and should be noted. Comment noted. 23-481399-A00/TL960001 Page 3 of 5 January 4, 1996 Copyright 1996 Kleinfelder,Inc.