Laserfiche WebLink
"0 <br /> INTERIM REMEDIAL WORKPLAN <br /> Arts and Artists <br /> 204 East Lodi Ave. <br /> INTRODUCTION <br /> In accordance with a request by Ms. Mary Lehr, Geological Audit <br /> Services, Inc. (GeoAudit) has prepared this work plan to install a <br /> vadose zone remediation well on the property located at 204 East <br /> Lodi Avenue in Lodi, California (the site) . <br /> BACKGROUND <br /> The site is located in a flat commercial area in central Lodi. It <br /> is our understanding that a 550-gallon underground fuel storage <br /> tank containing leaded gasoline was removed by Thorpe Oil Co. in <br /> January, 1987 , and that soil samples collected at that time were <br /> contaminated. Three groundwater monitoring wells were installed in <br /> August 1987 , and all showed evidence of contamination. By late <br /> 1991 , two of these wells had gone dry, and were replaced by two new <br /> wells in May 1992 . Three additional wells (MW-6 through MW-8) were <br /> completed in May 1993 . Figure 2 shows the location of all wells on <br /> the site. The newest wells served to delineate the lateral extent <br /> of groundwater contamination, and additional monitoring wells are <br /> not required at this time. A quarterly monitoring program is <br /> currently in progress. In June of 1993 , San Joaquin EHD approved <br /> the installation of one vadose zone remedial well for the purpose <br /> of conducting a feasibility study of in-situ vapor extraction <br /> and/or bioremediation of soil contamination. <br /> In previous drilling at this site, vadose-zone contamination was <br /> detected in only one boring (MW-1) . This boring is the nearest to <br /> the former tank cavity, which is located inside the Art & Artists <br /> building. Sail samples were collected at 5-foot intervals in this <br /> boring, but only three were submitted for laboratory analysis. <br /> Gasoline contamination was detected in all three, which ranged in <br /> depth from 10 to 46 feet. Groundwater was encountered at <br /> approximately 50 feet when this boring was drilled. <br /> PROPOSED WELL <br /> In order to access the contaminated zone beneath the tank cavity, <br /> GeoAudit proposes to drill a slant boring angled at approximately <br /> 150 from vertical. It will be completed as remedial well RW-1 in <br /> accordance with the design shown in Figure 3 . The well will be <br /> located in the alley, approximately 5 feet behind the building. <br /> This location should provide a 5-foot clearance from existing <br /> underground utility lines. It will be drilled to a depth of 55 <br /> feet, terminating at a true vertical depth of 53 . 5 feet. Samples <br /> 1 <br />