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PUBLIC hilJALTHSERVI(*,-..#ES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weiser Avenue, Third Floor • Stockton, CA 95202 6.1i <br /> 209/468-3420 <br /> JOE TOSTE FEB 0 9 1998 <br /> TOSTE FARMS <br /> 2480 TOSTE ROAD <br /> TRACY CA 95376 <br /> Re: Grant Line Gas and Food Site Code: 1580 <br /> 2420 Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review <br /> of the Advanced GeoEnvironmental "Quarterly Report - October 1997" dated November 25, 1997 and <br /> received by PHS/EHD on December 1, 1997. PHS/EHD has prepared the following comments for your <br /> consideration and action. <br /> The report included the results of the October 29, 1997 groundwater monitoring and sampling event. <br /> Significant groundwater contamination continues to be evidenced and which remains undefined. <br /> Additionally the concentrations in monitoring well, MWl, suggest a continuing source of contamination to <br /> groundwater either in the vicinity of the currently operating tanks or where remaining soil contamination <br /> exists. The analysis of the groundwater sample collected from MWi evidenced Methyl Tertiary Butyl Ether <br /> (MTBE)concentrations of 530 ppb using EPA Method 8020. The groundwater samples also underwent EPA <br /> Method 8260 (GC-MS) and 680 ppb MTBE (MW1)was evidenced along with detections of 1,2,4- <br /> Trimethyl benzene (MW2), Chlorobenzene (MW4), and 1,4-Dichlorobenzene (MW4). <br /> The report included recommendations to install an additional monitoring well, perform feasibility analysis <br /> and to continue quarterly monitoring and sampling. in correspondence dated June 18, 1997, PHS/EHD <br /> approved the work plan that was submitted and dated June 10, 1997, with some modifications. PHS/EHD <br /> requested that a City of Tracy Encroachment Permit be obtained so that PHS/EHD could issue the permit to <br /> perform the approved work. PHS/EHD has not received any indication that efforts have been initiated to <br /> secure the encroachment permit. PHS/EHD under separate cover has returned the Advanced <br /> GeoEnvironmental check#10135 dated June 5, 1997, pursuant to PHS/EHD's check holding policy. <br /> Please provide evidence that efforts are underway to secure the necessary permits to perform the <br /> approved field activities. <br /> Once permits have been issued, you may proceed with scheduling field activities. <br /> If you have any questions, please contact Mary Meays at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> At&-%�a <br /> Mary Meays, Senior REHS Margare Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> cc: Pat Anderson, Central Valley Regional Water Quality Control Board <br /> CC UST Cleanup Fund, State Water Resources Control Board <br /> cc: Bob Marty, Advanced GeoEnvironmental <br /> A Division of San Joaquin County Health Care Services <br />