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r <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit.Supervisor <br /> Z Donna K.Henan,R.E.H.S. <br /> `:< 304 East Weber Avenue, Third Floor Carl Bergman,R.E.H.S. <br /> Director <br /> Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202.-2708 Douglas W.Wilson,R.E.H.S. <br /> eq. —.7 Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> <ik6A Laurie A.Corolla,R.E.H.S. <br /> Progran Manager Fax: (209) 464-0138 Robert McClellan,R.E.H.S. <br /> Mark Barcellos, RI.H.S. <br /> KEN AND ED ENDICH JUN 2 9 2005 <br /> TOP FILLING STATION <br /> 1770 GILLIS RD <br /> STOCKTON CA 95215 <br /> RE: 101 S. Wilson Way <br /> Stockton, California <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Quarterly Report — First Quarter 2005 (QR), dated 02 June 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 MW-1 <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 />