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ENVIRONMENTAL HEALTH DEPARTMENT <br /> c0 SAN JOAQUIN COUNTY <br /> �G Unit Supervisor's <br /> � <br /> < <br /> < Donna K Heran,R E H S Carl Bor man, R E H S <br /> 304 East Weber Avenue, Third Floor <br /> a Director <br /> • Al Olsen,R E H S Stockton, California 95202-2708 Mike Huggins,It E H S ,R D I <br /> • � ► P Douglas W Wilson,R E H S <br /> Program Manager <br /> 4�rxo�d� Laurie A Cotulla, H S Telephone (209) 468-3420 Margaret Lagono,R E H S <br /> Program Manager Fax (209) 464-0138 Robert McClellon,R E H S <br /> Mark Barcellos,R E H S <br /> KEN AND ED ENDICH JUN 2 9 2005 <br /> TOP FILLING STATION <br /> 1770 GILLIS RD <br /> STOCKTON CA 9521.E <br /> RE 101 S Wilson Way U M 131 In, 7 t0 <br /> Stockton, California <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Quarterly Report — First Quarter 2005 (QR), dated 02 Jude 2005, prepared on <br /> your behalf by Advanced GeoEnvironmental, Inc (AGE) for the above referenced <br /> site <br /> The QR reports that since initiation of the interim pump and treat system for <br /> impacted groundwater in November 2004, approximately 116,640 gallons of <br /> water had been treated, removing approximately 58 pounds of petroleum <br /> hydrocarbon contaminants Since initiation of the interim soil vapor extraction <br /> • (SVE) system in August 2004, approximately 13,876 pounds of petroleum <br /> hydrocarbon contaminants have been removed from impacted soil <br /> Figure 3 shows the inferred groundwater flow direction to be toward the <br /> southeast in the first zone of groundwater, while Figure 4 shows groundwater in <br /> the second zone to be migrating toward the more usual east-northeast Figures <br /> 5, 6, 7 and 8 show the distribution of contaminant total petroleum hydrocarbons <br /> as gasoline (TPH-g) and methyl tert-butyl ether (MTBE) in the first and second <br /> groundwater zones on both your site and the 102 S. Wilson Way site Uncertainty <br /> regarding the lateral extent of your plume toward the north, east and sometimes <br /> southeast, and the connection of your plume with the plume on the 102 S Wilson <br /> Way site is indicated by query marks on the figures <br /> The QR contained recommendations from your consultant AGE <br /> • Continued quarterly monitoring and sampling of wells VW-1 (B and C), <br /> VW-2, VW-3A, MW-2 (A-E) and MW-7 (A-E), <br /> • Conduct quarterly monitoring events concurrently with those at the 102 <br /> and 130 S. Wilson Way sites, <br /> • Quarterly monitoring, but semi-annual sampling of monitoring wells MWA <br /> through MW-5, and <br /> • Adding wells VW-1C, VW-2A, and VW-3A to the Interim pump and treat <br /> groundwater remediation system due to the intensely impacted <br /> groundwater currently monitored by these wells <br /> i <br />