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1 - <br /> i <br /> GEO-PHASE <br /> ENVIRONMENTAL <br /> CORRECTIVE ACTION PLAN <br /> 1 Valley Water Treatment <br /> 612 N. Buena Vista <br /> Stockton, California <br /> December 12, 2006 <br /> GPE Project No. 480.2 <br /> 1 1.0 INTRODUCTION <br /> ' A gasoline release at the subject site has impacted the groundwater with <br /> elevated concentrations of gasoline The lateral and vertical extent of the <br /> contamination has been established, but groundwater monitoring data <br /> continue to indicate a small, but persistent groundwater gasoline plume in <br /> the vicinity of the former tank pit. <br /> ' The boring log from a monitoring well (MW-1) through the pit indicates the <br /> presence as elevated concentrations of gasoline in the soil at a depth of 5 to <br /> 15 feet below grade. There is little soil contamination below 15 feet. The <br /> purpose of the proposed excavation is to remove a small volume of the most <br /> highly impacted soil immediately beneath the original tank pit. The removal <br /> of this source of groundwater contamination should allow natural <br /> ' attenuation to adequately mitigate the release.. <br /> ' 2.0 SITE HISTORY <br /> The site consists of a single parcel of light industrial use Property <br /> ' encompassing a total area of about 0.8 acres. It is on the east side of Buena <br /> Vista Avenue at its terminus against the deep water turning basin and just <br /> south the intersection with Fremont Street. A water softener company, <br /> (Valley Water Treatment) has occupied a portion of the parcel. <br /> ' 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br /> 1 <br />