COMPLIANCE INFO_1992 - Laserfiche WebLink

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D kNj KLEINFELDER all applicable laws and regulations": This law, in essence, places responsibility for closure oversight in the hands of the CVRWQCB. 7-M Mfg. is proposing that the landfills and surface impoundments be closed as unclassified WMUs under Chapter 15, Title 23, California Code of Regulations. Chapter 15 states that at the discretion of the CVRWQCB, many of the provisions in the Chapter can be waived including those calling for a four foot thick, multi -layered cap. 6.2.3.2 Proposed Cap Configuration Landfills at the site are already covered with at least 1 foot of soil. This existing cover will be the basis for the proposed cap configuration. The existing soil thickness will be supplemented with either paving or vegetation. In some areas there will be a need for excavation to reach grade. Plate 4-2 shows areas that will be paved, or in some cases, areas that may optionally be paved. Where paving covers a WMU, the cap will consist of the existing soil topped with asphalt. As shown in Table 6-1, the existing soil thickness over the WMUs is expected to be at least one foot thick. Specifically, the soil would be compacted to 85% relative compaction and then 10 inches of AB (aggregate base) would be placed at a compaction of 95%. The AB would then be topped with a three inch thick overlay of AC (asphaltic concrete). These compaction and paving specifications (AB and AC thickness) may change depending on the anticipated uses of the paved area. Unpaved Areas In areas where the WMUs are not paved, the existing soil cover will be vegetated with a grass to control erosion. In some cases, excavation to reach design grade will be necessary. The grass selected for this application is Blando Brome, a dry -land grass well suited for central valley climates and recommended by the Soil Conservation Corps for erosion control. Appendix A contains additional information on the use and application of Blando Brome for erosion control. CR14-92-12 Page 28 of 39 24-220109-1709 Copyright 1992 KLeinfelder, Inc.