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STATE OF CALIFORNIA <br />I _�= <br />CALIFORNIA REGIONAL WATL..., QUALITY CONTROL BOARD— <br />GEORGE DEUKMEJIAN, Govenor <br />CENTRAL VALLEY REGION <br />3443 ROUTIER ROAD <br />SACRAMENTO, CA 95827-3098 <br />U <br />I <br />d <br />L" <br />5 April 1988 <br />Mr. Tom Horton <br />Department of Public Works <br />County of San Joaquin <br />P.O. Box 1810 <br />Stockton, CA 95201 <br />SWAT PROPOSAL REVIEW COWENTs, CORRAL HOLLOW LANDFILL, SANIJOAQUIN COUNTY <br />Thank you for the 25 March 1988 response to our comments on the Solid Waste <br />Assessment Test (SWAT) proposal for the Corral Hollow landfill. We concur that <br />the wells to be constructed to satisfy SWAT requirements also fulfill <br />requirements for a ground water monitoring program under Title 23, California <br />Code of Regulations, Article 5 (Subchapter 15). The revised Subchapter 15 <br />monitoring program will be described in the waste discharge requirements (WDRs) <br />when they are updated. <br />Modifications to the proposed monitoring program suggested during our meeting on <br />I April 1988 included soil borings near the east corner of Module 2 and the <br />central northeast side of Module 4. These two borings will be made in lieu of <br />three borings between the landfill and Corral Hollow Creek suggested in our <br />review of the SWAT proposal. These borings will be developed into monitoring <br />wells if warranted by hydrogeologic conditions. The need for well construction <br />will be determined by your consultant in the field during drilling. Field work <br />will also include installation of two additional deep wells (MW -2 and MW -3) <br />completed in the regional aquifer, one shallow well (MW -1), and a shallow well <br />(MW -5.) near MW -3, if it is likely that a perched water table may develop near <br />MW -3. <br />The soil sampling strategy proposed for the shallow borings in our review will <br />be modified so that samples with highest moisture content are selected for <br />analysis rather than a composite sample for each boring. <br />If you have any questions, ple'ase call Michael Mosbacher at (916) 361-5736. <br />WLA4./Ile <br />WILLIAM / MARSHALL, Chief <br />Waste Discharge to Land Unit <br />SER: sg <br />