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27 February 2004 <br /> AGE-NC Project No 95-0130 <br /> IPage 5 of 6 <br /> • EDB has previously been detected from wells MW-7B, VW-1B, VW-1C and VW-2A at <br />' concentrations significantly above the DHS's Maximum Contaminant Level (MCL) in <br /> drinking water <br />' • The high concentrations ofpetroleum hydrocarbons detected in samples collected from wells <br /> MW-6 (A and B), MW-7 (A and B), VW-1 (B and C), VW-2A and VW-3A indicated that <br /> these wells are within or near the dissolved petroleum hydrocarbon"core area"of the plume <br />' (Figures 5 through 8) <br /> • The lateral and vertical extent of the dissolved petroleum hydrocarbon plume is not known <br />' toward the northwest,north, northeast, east and southeast of the area bound by wells MW-1 <br /> through MW-7 (Figures 5 through 8) <br /> I <br /> 5.0. RECOMMENDATIONS <br />' Based upon the results of the fourth quarter 2003 investigation, AGE recommends <br /> • Continued quarterly ground water monitoring of wells VW-1 (B and C), VW-2A, VW-3A, <br />' • MW-6 (A-E) and MW-7 (A-E) The first quarter 2004 ground water monitoring event was <br /> already performed on 09 February 2004, a second quarter 2004 ground water monitoring <br />' event is tentatively scheduled for 12 May 2004 <br /> • Conduct future ground water monitoring events concurrently with the Knowles/Rock <br /> Property site(102 South Wilson Way) and the Arco AM/PM site (130 South Wilson Way), <br />' • Continued quarterly depth-to-water measurements in all monitoring wells at the site, but <br /> reduced ground water sampling frequency from a quarterly to a semi-annual program, AGE <br />' believes that continued quarterly ground water sampling from these wells at this stage of the <br /> investigation is not cost effective and will not provide enough useful information to <br /> supplement the ongoing investigation Semi-annual sampling events should be adequate to <br />' monitor ground water impact at these wells and should be re-evaluated on a semi-annual <br /> basis <br />' An interim remediation work plan was submitted by AGE to the SJCEHD on 21 May 2003,the work <br /> plan was approved by the SJCEHD on 10 June 2003 To date, the ground water remediation <br />' equipment has been installed at the site AGE is currently in the process of installing anew electrical <br /> service, through Pacific Gas and Electric (PG&E) AGE anticipates start-up of the interim <br /> remediation system by March 2004 <br /> 1 <br /> i <br /> Advanced GeoEnvu onmental,Inc <br /> 1 <br />