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California Stop Page 2 <br /> 2224 Manthey Road July 16, 2012 <br /> Stockton, California 95206 <br /> remediate the impacted soil by SVE. The EHD directs that a work plan to install an SVE system <br /> be submitted to this agency by 12 September 2012 that includes the installation of the one <br /> additional SVE well south of the USTs. <br /> In light of the preliminary analytical results showing moderate concentration reduction of <br /> contaminants of concern for groundwater collected in June 2012, following the SVE pilot test <br /> conducted in March 2012, and the favorable results reported from the SVE pilot test, the EHD <br /> recommends delay of the ozone pilot test approved by this agency and instead focus on <br /> installing the SVE system to see if this remedial method will suffice in achieving water quality <br /> objectives. <br /> As noted by AGE in Well Installation and Additional Site Assessment Report, dated 21 February <br /> 2012, the groundwater plume does not appear to be defined east of monitoring well MW-6 in the <br /> shallow aquifer between approximately 15 and 30 feet bsg. Nevertheless, the EHD <br /> recommends that you delay the installation of the one off-site monitoring well to be located on <br /> the 1-5 south on-ramp, conditionally approved by this agency by letter dated 31 August 2011, <br /> until the effects of the SVE system have been determined. <br /> Groundwater from newly installed monitoring wells MW-9, MW-10 and MW-11 had been <br /> sampled twice, in November 2011 and June 2012, and contaminants of concern have not been <br /> detected in any of the samples. Therefore, the EHD directs that these three wells be sampled <br /> annually along with MW-5 for TPH-g; benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX); MTBE, TBA and tertiary-amyl methyl ether (TAME). Continue collecting groundwater <br /> semi-annually from MW-1 through MW-4 and MW-6 through MW8 for these sarne constituents. <br /> Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartneV@sjcehd.com if <br /> you have any questions concerning this letter. <br /> Sincerely, <br /> Victoria L. McCartney, RENS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Timothy J. Cuellar, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />