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STAI E OF CALIFORNIA _ _ GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER' OUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> C!`d�1i?OMEisi-AL HEALTH <br /> 6 July 1988 E `JICES <br /> Mr. John Johnson - <br /> The Customer Company <br /> P.O. Box 886 <br /> Benecia, CA 94510 <br /> _ ........._ a _ <br /> NEED FOR ADDITIONAL MONITORING WELL AT,. FOOD AND LIQUOR STORE 1890 <br /> --NORTH MAIN STREET,e MANTECA <br /> Regional Board staff has reviewed a ground water monitoring <br /> report received from your site consultant (Kleinfelder) . The <br /> report indicates that no ground water contamination was detected- , <br /> in the three on-site monitoring well samples collected 27 May <br /> 1988 . Kleinfelder also measured water levels in the monitoring <br /> wells on the same day and determined that the gradient was to the <br /> southwest. <br /> Contaminated soil was removed from the vicinity of the pump <br /> islands and the tank pit at this site in 1987 . Unfortunately, <br /> there is no monitoring well southwest (downgradient) of the <br /> removed pump island location to verify the present duality of the <br /> ground water in this vicinity. There is also a water supply well ` <br /> several hundred feet downgradient from this site. We have <br /> discussed this with the San Joaquin Local Health District and <br /> concur that an additional monitoring well is to be installed in <br /> the downgradient direction (between MW-1 and MW-3 and southwest <br /> of the pump islands that were removed) . Once the well has been <br /> installed, it is to be properly purged and sampled. The soil and <br /> -- <br /> ground `water`�samples�are to-be"arSalyzed with--results -sent��to-"the <br /> Regional Board and the San Joaquin Local Health District to <br /> verify the amount of remaining soil contamination and that no <br /> ground Ater contamination is present at this site. <br /> The r-s" is from the new monitoring well are due?28 �zcrtst 2388 , <br /> If y a any questions, please call me at . (916) 3161-5740. <br /> ORDON T- <br /> Undergroun T nk Program Coordinator <br /> GLB/ S :g ' <br /> cc: r. Laurie Cotulla, San Joaquin Local Health District, <br /> Stockton <br />