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PUBLIC 11-YEALTH SERV ES UlNc <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> Third Floor • Stockton, CA 95202 c4w `" <br /> 304 East Weber Avenue, cu <br /> 209/468-3420 <br /> . <br /> BRETT HUNTER ARR 2 � <br /> CHEVRON USA INC <br /> P O BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Service Station #9-1918 SITE CODE: 1952 <br /> 2905 West Benjamin Holt Drive <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the analytical results obtained during the groundwater sampling of the air <br /> sparge wells. PHS/EHD has discussed the soil and groundwater analytical results obtained <br /> during the installation and the groundwater sampling of the air sparge wells with Central Valley <br /> Regional Water Quality Control Board staff and has prepared the following directive for your <br /> response. <br /> The concentrations observed in the groundwater samples obtained from the air sparge wells <br /> that are screened at approximately 27 - 30 feet below ground surface warrant additional vertical <br /> investigation to assess the migration and disposition of soil and/or groundwater contamination <br /> in the area of the former tank location. <br /> At minimum, one soil boring immediately outside of the tank pit will be required. PHS/EHD <br /> understands that Chevron is reluctant to bore through the tank pit because of problems which <br /> may be encountered due to.the pea gravel material used for backfilling. If necessary and based <br /> on field observations, additional borings will be required to evaluate the lateral extent of the <br /> contamination plume's vertical migration. <br /> Please submit a work plan as soon as possible, since the results must be included within the <br /> corrective action plan that is due no later than May 30, 1997. <br /> If you have any questions, please contact me at (209) 468-0337. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division. <br /> C <br /> Mary Meays, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Aaron O'Brien, Geraghty and Miller <br /> A Division of Sanjoaquin County Health Care Services <br />