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, t <br /> STA E OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD- <br /> CENTRAL VALLEY REGION D d <br /> 3201 S STREET <br /> SACRAMENTO,CALIFORNIA 95816-7090 <br /> PHONE: (916)445-0270 JAN 2 6 1-w- <br /> ENVIROMENTAL HEALTH <br /> :. FERMIT/SERVICE$ <br /> 23 January 1987 <br /> Mr. Ron Valinoti <br /> San Joaquin Local Health District <br /> Post Office Box 2009 <br /> Stockton, CA 95201 <br /> SAMPLE RESULTS FROM THE CARDOZA WELL, TRACY, SAN JOAQUIN COUNTY <br /> Enclosed for your information are copies of lab results from the Cardoza's <br /> domestic water well . An EPA 601 (Halogenated Volatile Organics) and a standard <br /> mineral analysis were run from samples collected on 7 November 1986. <br /> Dichloromethane was detected in the samples from both the well and kitchen tap. <br /> The levels range from 9-22 ppb. These values are below the State Action Level <br /> of 40 ppb but well above the EPA established one-in-a-million cancer risk level <br /> of .19 ppb. <br /> Mrs . Cardoza was notified of the findings on 21 November 1986, the day the EPA <br /> 601 results arrived at our office. The family had been using bottled water <br /> previous to my sampling and continues to use it for consumption. <br /> Despite assurance from the laboratory that the dichloromethane detected was not <br /> a lab contaminant, we feel it necessary to confirm this before taking further <br /> action. Therefore, I will be collecting more samples from the subject site in <br /> the near future. Two laboratories will be used and informed of the situation. <br /> Depending on these results further action may be planned. <br /> I will send you copies of the results when received. If you have any questions <br /> regarding this matter, please call me at (916) 361-5667. <br /> DAVID L. BRENT <br /> Project Engineer <br /> DLB:jj <br /> Enclosures <br /> cc: Department of Health Services, Sanitary Engineering Branch, Stockton <br /> Mrs. Marsha Cardoza, Tracy <br />