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E v Mr. Marty Hartzell -2- ADDRESSING COMMENTS TO FINAL CONSTRUCTION QUALITY ASSURANCE REPORT CORRAL HOLLOW LANDFIL The vegetative soil cover was compacted more than appropriate for the establishment of vegetation. Please see the County's response to Task 3 below for a work plan to remedy this situation. 2. Describe how the Discharger plans to bring the closure cover extension into compliance with the technical specifications of the project. County Response: The closure cover is in compliance with the technical specifications, with the exception of the compaction of the vegetative soil cover. Please see responses to Task 1 above. 3. Describe how the Discharger plans to establish vegetation on the cover or other means of preventing erosion of the final closure cover. County Response: The County has consulted with Ms. Karrie Reid, Environmental Horticulture Advisor at the University of California Davis Agriculture Extension for a work plan to remedy the over compaction of soil and to induce vegetative growth over the final cover. Based on her recommendations (Attachment C), the County will implement the following work plan: • Surface Preparation (Figure 2) Final cover area: The County will till (disc) and smooth out the existing top soil to a depth of six (6) to eight (8) inches. Over the gas well laterals areas, tilling will be limited to four (4) inches. The County will verify that the compaction of this layer does not exceed 88 percent. The erosion - control berms and other BMP's installed earlier this year will be retained. Areas adjacent to the cover: The County will till and smooth out the top soil by six (6) inches without excessive compaction. • Erosion Control BMPs in the Cover Area (Figure 1) The County will install additional straw wattles between erosion control berms to further slow the flow of water across the closure area. These BMPs will be installed prior to hydroseeding. • Hydroseeding the Final Cover and Adjacent Areas (Figure 2) The County will apply a hydroseed slung of California native grass seed mix at 31 PLS pounds per acre, Flex Terra Flexible Fiber Matrix at 4000 lbs/acre, and fertilizer at 1000 lbs/acre. The Flex Terra Flexible Fiber Matrix bonds to the soil to prevent erosion more successfully than a conventional straw layer. Furthermore, this hydroseeding method can be applied entirely from the road, to minimize over compaction of the newly -prepared top soil by limiting the use of heavy equipment over the vegetative areas. 4. Provide an amended Final CQA Report that reports all testing performed, including any test failures. The Final CQA Report should provide a log of all testing that was performed regardless of whether the test failed or passed specifications.