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bcace oz caiirorxxia WEALMUSUFAU To Russ Colliau State Clearinghouse 1400 Tenth Street Sacramento, CA 95814 Laiizornia znvi.ronmentai PrAwkection Agency Date: May 19, 1993 Ken Hill San Joaquin County Department of Public Real Property/Environmental Division 1810 East Hazelton Avenue Stockton, CA 9552205 From (/ J ENVIRONMENTALMAY 2 4 1993 PERMIT/SERVICES Vincent Paul, Associate WMS, Facility Review Section Permitting and Enforcement Division CALIFORNIA INTEGRATED WASTE- MANAGEMENT BOARD SUBJECT: SCH # 93052006: Initial Study and proposed Mitigated Negative Declaration for the Corral.Hollow Sanitary Landfill Final Closure and Postclosure Maintenance Plan, San Joaquin County. PROJECT DESCRIPTION The County of San Joaquin, acting as Lead Agency, proposes to close the Corral Hollow Sanitary Landfill, (SWIS # 39 -AA -0005). The Corral Hollow Sanitary Landfill is a 45 acre Class III landfill operated by the County of San Joaquin and is located on Corral Hollow Road, approximately five miles south of Tracy, California. The site is subject to water protection measures under Discharge Requirement Order Number 86-046 issued by the Regional Water Quality Control Board (RWQCB), Central Valley Region. The site utilizes approximately 43 acres for landfill operations. The County proposes to begin closure of the site in January 1995, which involves the removal of all existing structures from the site. In addition, any unused environmental controls at the time of final closure are scheduled to be decommissioned. The proposed project involves the placement of a four -foot thick layer of soils consisting of a two -foot foundation layer, a one - foot compacted clay barrier layer, and a one -foot vegetative layer. It is anticipated at the time of closure that intermediate cover will have already been placed over much of the site, thus requiring approximately one -foot of additional soil for completion of the foundation layer. The final landfill cover will be constructed to a minimum of three percent grade to provide proper drainage, prevent high velocity overland flow, and prevent slope reversal. Upon completion of the final cover, the entire site will be planted with bromme grass or other appropriate vegetation for slope stabilization and erosion control.