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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY 2 <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> O'q G1FpR�`P <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) *Stockton, California 95201 <br /> (209) 468-3400 <br /> ;'JUL 10 1991 <br /> BILL KELLER cayly <br /> GENSTAR WESTERN STONE PRODUCTS <br /> P 0 BOX 3171 <br /> MODESTO CA 95353 <br /> RE: Genstar Western IN REPLY REFER TO SITE CODE: 1393 <br /> Stone Products <br /> 8181 W. 11th Street <br /> Tracy, CA 95376 <br /> Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the April 26, 1991 Second Quarter Groundwater Monitoring <br /> Report and the May 8, 1991 Closure Recommendation, both submitted <br /> by WaterWork Corp. We have the following comments regarding these <br /> documents. <br /> PHS/EHD does not agree with the closure recommendation. Central <br /> Valley Regional Water Quality Control Board (CVRWQCB) concurs with <br /> our determination that closure is not warranted at this time, <br /> On April 12, 1991, PHS/EHD requested a downgradient groundwater <br /> monitoring well be installed. As stated in your report, the <br /> groundwater flow direction remains northwesterly, therefore, MW-4 <br /> is not downgradient from the tank pit. <br /> Prior to the installation of a downgradient monitoring well, <br /> PHS/EHD should be present to observe the next two quarterly <br /> sampling events. Please be advised that this office requires 48 <br /> hours notice prior to any site activity, including sampling. <br /> On April 12, 1991, PHS/EHD requested a soil remediation plan be <br /> submitted based on the following information: <br /> 1. The soil sample taken August 23, 1988, at 11� feet from <br /> the south end of formeii tank 13 had a heavy petroleum <br /> odor observed at the time of the tank removal. <br /> 2. The soil sample taken May 22, 1991, at 5.5 feet during <br /> the installation of MW-4 showed 5.8 parts per billion <br /> (ppb) benzene, 6.7 ppb ethyl benzene, 7. 6 ppb xylene and <br /> 2500 ppb diesel. The certified boring log indicated <br /> static groundwater at 12 feet, therefore, soil <br /> contamination is not limited to the capillary fringe. <br /> A Division of San Joaquin County Health Care Services 400 <br />