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r I <br /> 612 N. Buena Vista, Stockton ................................................ <br /> ...Page 2 <br /> and cost analysis for several site remedial alternatives. Contaminated soil and <br /> groundwater removal in the immediate area of the former UST was selected as <br /> the desired remediation method. <br /> Before EHD can approve the proposed excavation, additional soil sampling is <br /> required in the former UST area to demonstrate the full extent of gasoline <br /> contamination caused by the unauthorized release. The additional <br /> characterization can be used to better demonstrate the area impacted by the <br /> release and the volume of soil removal required to mitigate the contaminant <br /> mass. <br /> The proposed limited point source removal of contaminated soil and ground <br /> water in the former UST area will be reconsidered after further characterization is <br /> completed and the data reviewed by EHD. <br /> Monitoring well MW-1 located in the UST area will be�destr:;oyed/removed during <br /> soil excavation. A replacement monitoring well (MW-1R) is,proposed in the <br /> former UST location after dewatering and clean soil replacement. Due to the <br /> distances of MW-2, MW-3, and MW-4 from the formes UST area, additional <br /> down-gradient monitoring wells will be required to better define groundwater <br /> contamination. Continued quarterly groundwater monitoring will be required until <br /> a no further action required letter is issued and site closure'[granted. The <br /> groundwater monitoring and sampling data will be used to evaluated the <br /> effectiveness of the corrective action performed. <br /> Please provide a WP addendum to EHD for review and comment by April 15, <br /> 2007. <br /> If you have any further questions regarding this matter, contact Harlin Knoll at <br /> (209) 468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Harlin Knoll, Senior REHS :lNuel Henderson, PG <br /> LOP/Site Mitigation Unit IV SLOP/Site Mitigation Unit IV <br /> c: CVRWQCB — Jim Barton <br /> SWRCB, Cleanup Fund <br /> GeoPhase <br /> Donald Brarid <br /> i <br />