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BOARD OF TRUSTEES SAN,"JOAQUiN LOCAL HEALTH D1S1-"w.T SERVING <br /> Al Crow,Pres. San Joaquin County <br /> Earl Pimentel,Vice Pres. 1601 East Hazelton Avenue City of Manteca <br /> Tommy Joyce,Sec'y. Stockton, California 95205 City of Escalon <br /> James F.Culbertson City of Lodi <br /> John D.Mast,M.D. JOGI KHANNA, M.D., M.P.H., DISTRICT HEALTH OFFICER City of Tracy <br /> Virginia Mathews City of Ripon <br /> Thomas Schubert,D.V.M. San Joaquin County <br /> Daphne Shaw City of Stockton <br /> Harvey Williams,Ph.D. San Joaquin County <br /> June 6, 1989 <br /> Southland Corporation ❑ <br /> Attn: Hal Miller <br /> P.O. Box 404 <br /> Pleasanton CA 94566 <br /> RE: 7-11 STORE <br /> 9110 THORNTON ROAD <br /> Please be advised that this office has reviewed the above <br /> referenced site' s Quarterly Reports and a Work plan for the <br /> installation of additional monitoring wells. We have found the <br /> plan to be inadequate as the following considerations are not <br /> addressed. <br /> 1: Continued reference is made in the quarterly reports to <br /> gradient patterns. Data is insufficient to adequately illustrate <br /> a true gradient or recovery capture. <br /> 2 : Additional work is needed to adequately define the area <br /> or areas of influence and to provide for "zero-line" definition. <br /> The installation of clustered monitoring wells may provide needed <br /> data. However, the southern (#10 and #8968) occurrence of some <br /> sampling detections of hydrocarbons must be addressed. <br /> 3 : Hydraulic control of the contaminant plume is doubtful. <br /> Pumping wells PW1 AND RW1 do not appear to be creating large <br /> enough cones of depression to capture the entire plume. In <br /> addition, the leaking water pipe behind the store has caused the <br /> ground water elevation in PW1 to be higher than in monitoring <br /> well #11. <br /> There has been too much delay and a great deal of project manager <br /> turn over on this site. Domestic water wells in this populated <br /> area has never been adequately nor consistently sampled and <br /> measured. A consorted effort by Southland is needed to properly <br /> manage and define this contaminate plume. <br /> Administration Clinical Services Environmental Health Public Health Nursing <br /> 468-3400 468-3830 468-3420 468-3860 <br /> Air Pollution Community Services Laboratory WIC <br /> 468-3470 468-3820 468-3460 468-3280 <br /> AIDS Information 468-3820 <br />