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lam_ i <br /> PUBLIC'AEALTH SERVICES aP4u�k <br /> SAN JOAQUIN COUNTY P anX <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer9.. <br /> ClppR� <br /> 445 N. San Joaquin Street 0 P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> JOSEPH TOSTE JR <br /> 2480 TOSTE ROAD .JU! 0 71994 <br /> TRACY CA 95376 <br /> RE: Grantline Gas and Food SITE CODE: 1580 <br /> 2420 West Grant Line Road ; <br /> Tracy, CA 95276 <br /> San Joaquin County Public Health Services, Environmental Health Division'(PHS/EHD) has completed <br /> review of the "Quarterly Groundwater Monitoring - First Quarter 1994" report dated May 18, 1994 and <br /> prepared by Advance Soil Technology (AST). PHS/EHD has the following comments for your <br /> consideration. <br /> The report included the results of the April 13, 1994 groundwater sampling event. Groundwater. <br /> contamination was detected in MW1 and MW2 and the gradient direction was confirmed to be northerly. <br /> The report also included a proposal to install three additional monitoring wells. PHS/EHD requested in <br /> correspondence dated April 13, 1991, additional soil and groundwater investigation to determine the extent <br /> of petroleum hydrocarbon contamination. PHS/EHD concurs that additional investigation will be <br /> necessary; however, PHS/EHD disagrees with the proposed location for the soil borings which will be <br /> converted into monitoring wells. PHS/EHD requests re-consideration of the proposed soil <br /> boring/monitoring well Iocations to investigate the pump island area and to define the extent of <br /> groundwater contamination down gradient of the former tanks. <br /> Please submit an addendum to the "Soil and Groundwater Investigation"work plan dated December 31, <br /> 1993. Also, please note that in order to characterize the subsurface environment, soil samples should be <br /> collected at 5 foot intervals until the boring is terminated. <br /> If you have any questions, please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Ways, Senior REHS Di ne 31�ns , REHS <br /> Site Mitigation Unit Supervisor <br /> MM12420GL <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Sohrab Rahimzadeh <br /> c: Alex Kassai, Advanced Soil Technology <br /> A Dkision of San Joaquin County Health Care Services <br />