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• r <br /> C <br /> TFES <br /> FES _ .. <br /> --.V rl,�ONA4 r 2 1 <br /> 1992 <br /> CONDOR EARTH TECHNOLOGIES INC. <br /> 1125 No. Golden State Blvd. 21663 Brian Lane <br /> February 14, 1992 Suite H P.O. Box 3905 <br /> P.O. Box 3448 Sonora, CA 95370 <br /> Turlock, CA 95381 (209)532-0361 <br /> Ms . Linda Turkatte (209)668-9234 FAX(209)532-0773 <br /> San Joaquin Public Health Services FAX(209)668.9248 <br /> Site Mitigation Unit <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: 11273 East Ada Avenue, Stockton, CA. <br /> Dear Ms . Turkatte: <br /> This letter is an addendum to the Problem Assessment Report, <br /> dated January 29, 1992, for the Sierra-Bay Farm Credit Services <br /> property located at 11273 East Ada Avenue in Stockton, <br /> California. As we discussed in a telephone conversation on <br /> February 11, 1992, the modifications to the proposed work are as <br /> follows: <br /> 1. Prior to field activities, Condor will notify the San _ <br /> Joaquin County Environmental Health Division at least <br /> 48 hours in advance. Approximately 15 cubic yards of <br /> soil are expected to be removed during the over- <br /> excavation. Visual inspection (evidence of soil <br /> staining) and field detection equipment (Organic Vapor <br /> Analyzer - FID) will be used to screen the soils during <br /> excavation to assist in evaluating the limits of <br /> contamination. <br /> 2. A minimum of five (5) soil samples will be collected <br /> from the enlarged excavation, one from the floor and <br /> each of the four walls for laboratory analyses. All <br /> samples will be collected in brass tubes, capped, <br /> wrapped with duct tape, labeled and immediately placed <br /> in a cooler chilled with Blue Ice for delivery under <br /> chain-of-custody procedures to GeoAnalytical <br /> Laboratories in Modesto, California. The samples will <br /> be analyzed for TPH-G and BTEX. <br /> 3. The excavated soil will be stockpiled on and covered <br /> with plastic sheeting for temporary storage on site to <br /> await disposal at an approved disposal facility <br /> (Forward Landfill or BFI depending on average TPH--G <br /> concentration) . <br /> ENVIRONMENTAL GEOLOGICAL • ENGINEERING • GEOTECHNICAL <br />