Conceptual Soil Management Area Studies and. Once the County selects the soil management grading option to pursue, we will meet with the County to discuss design issues. At the conceptual stage, the design issues that will be addressed include drainage, erosion control, road upgrades, and slope stability. The existing soils balance will also be evaluated and adjusted, as necessary. For cost estimating purposes, we have assumed that adjustments to the soil balance will be relatively minor. The existing schematic grading plan will be updated to include benches and ditches that drain toward the proposed sedimentation pond. We understand that drainage calculations have already been performed to size the proposed sedimentation pond. We will review these existing calculations and modify them, as necessary. For cost estimating purposes, we have assumed these modifications will be minor. If possible, we will incorporate standard County of Santa Xxxx drainage details and erosion control best management practices into the conceptual design. We have assumed that the County will be responsible for developing all landscaping details (mulch, irrigation, hydroseeding, and other vegetation). The conceptual design issues will be summarized in a technical memorandum. The conceptual drawings will include: • Final soil stockpile grading plan • Detail sheet showing conceptual drainage ditches sedimentation pond drainage structure sedimentation pond rock-lined spillway new Slough Road section at proposed scraper crossing location • Cross section sheet showing sections through the stockpile
