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Californiaegional Water Quality Co rol Boardiqlb, <br /> illz; Central Valley Region <br /> Karl E. Longley,ScD,P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secreta or Sacramento Main Office <br /> tT 1 <br /> Environmental/ ]1020 Sun Center Drive 4200,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> Protection <br /> http://)Aww.waterboards.ca.gov/centralvalley <br /> 13 March 2007 <br /> - J1 <br /> W. Michael Carroll <br /> San Joaquin County Dept. of Public Works <br /> Solid Waste Division <br /> rt P , <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF EVALUATION MONITORING PROGRAM WORD PLAN, CORRAL HOLLOW <br /> SANITARY LANDFILL, SAN JOAQUIN COUNTY. <br /> The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the <br /> Evaluation Monitoring Program Work Plan (Work Plan) for the Corral Hollow Sanitary Landfill <br /> (CHSL). The work plan was submitted in response to a letter dated 7 December 2006 where <br /> staff had determined the Corrective Action Program does not satisfy the requirements of Title <br /> 27, Section 204300). The work plan initiates an Evaluation Monitoring Program (EMP) in <br /> accordance with Title 27, Section 20385(x)(2) and 20425(a)(1)(2) to further define the nature <br /> and extent of the gas release beneath Corral Hollow Sanitary Landfill. <br /> Staff finds the work plan and proposed scope of work inadequate to thoroughly define the <br /> overall conditions of the Corral Hollow Sanitary Landfill. Based on the 4th Quarter 2006 data <br /> submitted on 31 January 2007, landfill gas (LFG) continues to be detected in all soil gas wells, <br /> particularly, well GW-6 south of the landfill. The work plan provides only nominal points to <br /> delineate the lateral and vertical extent of migrating LFG in the vicinity of well MW-5. The work <br /> plan does not provide investigation points along the southern boundary. The proposed work <br /> plan is not approved as submitted, and staff requests the Discharger prepare an amended <br /> work plan to incorporate the following conditions: <br /> 1. The Discharger must propose a more complete definition of the releases along the <br /> northern site boundary. Staff recommends installing a minimum of three soil borings <br /> northwest of the CHSL northern site boundary. These borings should be spaced a <br /> maximum of 300 feet apart. The proposed boring HP-3 should suffice as the center <br /> point with additional points placed northeast and southwest of HP-3 along a parallel line <br /> with the CHSL northern site boundary. <br /> 2. This Work Plan does not propose sufficient borings to define the eastern extent of the <br /> release. The Discharge must propose additional borings along this side of the landfill. <br /> Staff recommends a minimum of two soil borings northeast of the CHSL northeastern <br /> site boundary, east of Interstate 580. These borings should be spaced a maximum of <br /> 300 feet apart. The proposed boring HP-1 shall suffice as the northwestern point with <br /> California Environmental Protection Agency <br /> Q7 Recycled Paper <br />