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GEO-PHASE <br /> ENVIRONMENTAL <br /> Report <br /> Site Characterization-Second Event <br /> Former Karlson Trucking Facility <br /> 9909 East Woodward Avenue <br /> Manteca, CA 95366 <br /> March 2,2000 <br /> Project No. 191.2 <br /> 1.0 INTRODUCTION <br /> The site is located along the southeastern edge of the City of Manteca, CA, at 9909 East <br /> Woodward Avenue, which is adjacent to the intersection of Moffat Boulevard and <br /> Woodward Avenue. It consists of one triangular shaped parcel of land approximately 15 <br /> acres in size. The southern approximately 3/5ths of the site formerly was a truck service <br /> and switching yard. The remainder of the Property consists of an almond orchard. <br /> 1.2 Previous Environmental Work <br /> Previous environmental investigation revealed the presence of degraded diesel fuel <br /> contamination that impacted the soil and groundwater. This was first documented in a <br /> report entitled Phase IIA Environmental Site Assessment, Former Karlson Trucking <br /> Facility, 9909 East Woodward Avenue, Manteca Ca, dated October 28, 1998. In order to <br /> characterize the extent of the release, Geo-Phase Environmental subsequently completed <br /> a number of soil borings and installed a total of six groundwater monitoring wells, and a <br /> limited passive soil gas survey was also completed. A 7th well unrelated to the diesel <br /> investigation was also constructed. <br /> The data accumulated during the course of this investigation suggest that the diesel <br /> contamination is limited to the upper few feet of the groundwater column, and extends in <br /> the northwesterly direction in a long, narrow plume. Analysis of groundwater samples <br /> collected from the borings and wells have not previously defined the extreme down- <br /> gradient extent of the contaminant plume. The work documented herein was completed <br /> 2937 Veneman Avenue,Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto,Ca 95356 Fax: (209)569-0295 <br />