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STATE OF CALIFORAIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD '' q <br /> SACRAMENTO,CA 95827-3098 . a9 4 <br /> ENVIROtiiENTAL HEALTH <br /> 20 March 1987 FERfAIT/SERVICES <br /> Mr. Ron Valinoti <br /> San Joaquin Local Health District <br /> Post Office Box 2009 <br /> Stockton, CA 95201 <br /> SAMPLE RESULTS FROM SECOND ROUND OF TESTING AT CARDOZA WELL, SAN JOAQUIN COUNTY <br /> Enclosed are the results of the most recent set of samples taken from the <br /> Cardoza ' s domestic well . As you will recall from my 23 January 1987 letter, <br /> samples were split and submitted to two different certified laboratories (Eureka <br /> Labs and California Water Labs). This was done to verify the original findings <br /> of dichloromethane in water samples taken from the well in November 1986. <br /> The results of this most recent round of sampling show nondetectable values of <br /> dichloromethane and all other compounds tested for by EPA Method 601. This <br /> seems to confirm the suspicion that the original detection of dichloromethane <br /> was caused by laboratory contamination and not ground water contamination. <br /> In light of these results no further action will be taken by this office at this <br /> time. If you have any questions regarding this matter, please call me at (916) <br /> 361-5667. <br /> r \ <br /> DAVID L. BRENT <br /> Project Engineer <br /> DLB:jj <br /> Enclosure <br /> cc: Department of Health Services, Sanitary Engineering Branch, Stockton <br /> (w/o enclosure) <br /> Mrs. Marsha Cardoza, Tracy, <br />