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WORK PLAN <br /> L4THROP PROPERTY 4}IALLACE•i(UHLErA5500ATV.^4C. <br /> May 11, 1990 <br /> WKA No. 1184.02 <br /> Page 2 <br /> augers. Soil samples will be obtained at minimum five-foot intervals using a modified California <br /> sampler containing clean, two-inch diameter brass tubes. Sampling equipment will be cleaned <br /> with trisodium phosphate between sample intervals, and augering equipment will be steam- <br /> cleaned between boring locations. Sampling and testing would be in accordance with San <br /> Joaquin County protocol and all work would be performed under the direction of a certified <br /> engineering geologist. <br /> Soil samples will be screened in the field with an organic vapor analyzer. All sample tubes will <br /> be sealed with aluminum foil, plastic end caps and tape, and preserved on ice to mitigate <br /> volatile hydrocarbon loss; selected samples will be submitted under chain-of-custody to a <br /> California state-certified laboratory for analysis of total petroleum hydrocarbons [t7PH), EPA <br /> methods 5030/3550 and 8015 modified], benzene, toluene, xylene, ethyl benzene [(BTX&E), <br /> EPA method 8020], and tetraethyl lead (DOHS-LUFT). The borings will be backfilled with grout <br /> if contaminated cuttings and/or ground water are encountered. Contaminated soils generated <br /> during drilling will be stored on-site in sealed Department of Transportation approved 55-gallon <br /> drums until final disposition has been determined. <br /> If encountered, ground water will be sampled through hollow-stem augers after purging the <br /> augers of approximately three to five borehole volumes of ground water. This method is <br /> intended only as a preliminary indication of potential ground water contamination. Water <br /> samples will be obtained with single-usage polyethylene bailers, decanted into the appropriate <br /> containers, preserved on ice, and submitted to the laboratory for analysis of the above <br /> constituents. <br /> Upon completion of our field work and laboratory testing, we will submit a report presenting <br /> the results of our investigation, including a site plan, boring logs, laboratory test results, <br /> conclusions regarding the extent of contamination, and remediation or disposal options for the <br /> contaminated soils. <br /> Please call if you have any questions regarding our proposed scope of work. <br /> Wallace - Kuhl & Associates, Inc. <br /> Anthony Sar ' o David Von Aspern <br /> C.E.G. #1420 Staff Geologist <br /> AS:DVA:sdm <br /> cc: Raymond M. Quaresma <br />