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MM <br /> L . <br /> On December 3 and 4, 1991, under your supervision, TPE conducted overexcavation <br /> of about 65 cubic yards (cyd) of contaminated soil in the area of the former dispenser <br /> island and underground tanks. The excavation reached an average depth of about 10 <br /> feet and had the approximate limits shown in tite attached Figure. After completing <br /> overexcavation activities, 4 verification soil samples were collected from the sidewalls <br /> of the excavation at depths ranging from about 8 to 10.5 feet at the approximate <br /> locations shown in the attached Figure. The samples were collected by excavating a <br /> coherent block of soil with the bucket of a backhoe from the selected location and <br /> obtaining a soil sample from the bucket. The samples were collected in brass tubes <br /> driven by a slide-hammer corer into a ne.vly exposed soil st:rf:ce. After collecting <br /> earli sample, the brass tube ends were covered with aluminum fol! and capped with <br /> plastic end caps taped to the tubes with duct tape. The samples were stored in an <br /> iced cooler and transported to California Department of Health Services certified S & <br /> W Soil and Water Enviror:.cental Laboratory for chemical analysis for TPHG and <br /> BTEX by United States Envirehmental Protection Agency (EPA) methods 5020 and <br /> 8020, respectively, and for total lead by EPA method 7420. No TPHG, BTEX, or <br /> total lead were detected in any of the soil samples (see attached certified analytical <br /> reports). <br /> File excavated soil was stockpiled on site by AAA. <br /> If you have any questions concerning this addendum, call me at (510) 429-8088. <br /> Sincerely,l � <br /> G' r <br /> �.J�hlj V. Mrakovich <br /> Rel,istered Geologist Number 4665 <br /> cc: File <br /> Sami M. Ayesh <br /> Larry Flora <br /> 1 <br /> ,y <br />