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a <br /> PUBL C HEALTH SERVICES f <br /> O.P4UIN' C <br /> SAN JOAQUIN COUNTY <br /> a:. A <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> C4�J.. .••e�`p <br /> P.O. Box 2009 o (1601 East Hazelton Avenue) 0 Stockton,California 95201 c o se <br /> (209)468-3400 <br /> APR 12 .1991 <br /> BILL KELLER <br /> no PU U <br /> GENSTAR WESTERN STONE PRODUCTS <br /> P0BOX 3171 f <br /> MODESTO CA 95353 <br /> RE: Genstar Western IN REPLY REFER TO SITE CODE: 1393 <br /> Stone Products <br /> 8181 W. 11 St., Tracy <br /> Public Health Services,Environmental Health Division (PHS/EHD),has reviewed the January 30, 1991 First <br /> Quarter Groundwater Monitoring Report prepared by WaterWork for the above referenced site. <br /> Based on soil sample results obtained during the drilling of monitoring well #4 and the depth to <br /> groundwater (twelve (12) feet) the contaminated soil in the former location of tank #3 cannot be left in <br /> place. Submit a soil remediation plan by May 15, 1991. <br /> Monitoring well #1 was non-detect on October 30, 1990, however, on January 14, 1991, detectable <br /> concentrations of toluene and xylene were found. Zero lines have not been established,therefore, additional <br /> monitoring wells should be installed to show zero lines. At least one of the monitoring wells should be <br /> installed downgradient (northwest) of the former tank location. <br /> On site there are two production wells. The influence on hydraulic gradient should be explored. If both ; <br /> of these wells are not being used, one should be abandoned or destroyed under PHS/EHD permit. j <br /> Leach line locations should be identified since they may provide a conduit through which contamination may <br /> travel. <br /> If you have any questions contact Mary Meays, EHS, at (209) 468-3441. } <br /> Jog* Khanna, M.P.H. <br /> Health Offi r <br /> rie A. Cotulla, REHS, Program Manager <br /> nvironmental Health Division <br /> I <br /> I <br /> LAC/MM:nr <br /> c: CVRWQCB - Jim Maughan <br /> WaterWork - Russell Juncal <br /> A Division of San Joaquin County Health Care Services �� <br />