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MAMartin Thorpe %W01 16 October 1987 5 WEISSASSOCL4TE5 216 E. Lodi Avenue, and Dick Schauer, the property lessee, authorized installation of the wells on their property. Soil samples were collected from the boreholes every 5 ft to confirm stratigraphy and for possible chemical analysis. Samples were collected , in steam-cleaned 2-in. diameter brass tubes. they were immediately trimmed,. sealed with aluminum foil and plastic end caps, hermetically sealed with duct tape, and ' labeled and refrigerated for transport under chain-of-custody procedures to Brown and Caldwell Analytical Laboratories of Emeryville, California (B&C).. The auger flights and sampling equipment were steam-cleaned prior to use and between boreholes and the sampling equipment was rinsed between samples. Copies of chain-of-custody forms for the soil samples are included as Attachment A. Soil samples were surveyed in the field with an OVA which defects VOC vapor emissions from the soil and has a detection limit of 0.2 parts per million by volume (ppmv) . The deepest unsaturated soil samples from borings MW71 , MW-2 and MW-3 were submitted to B&C for chemical analysis. As requested by the S,7LHD, two additional unsaturated soil samples from MW-1 were analyzed to confirm OVA readings detected during drilling. OVA readings and laboratory analytic results for soil samples are presented in Table 1 and copies of B&C laboratory analytic reports are included as Attachment S. The OVA detected VOC vapor in all soil samples collected from MW-1. OVA readings for these samples ranged From 25 ppmv at 65.5 ft to greater than 1,000 ppmv at 21.2, 36 ,0 and 41 .0 ft. No VOC vapor was detected by the OVA in soil from MW-2. VOC vapors at 8.5 ppmv were detected by the OVA in a sample collected from 50. 5 ft in MW-3. Laboratory analytic results were below detection for the soil samples from MW-2 and MW-3. TFHC concentrations in samples from MW-1 ranged from 140 ppm at 46.2 ft to 6,900 ppm at 16.2 ft below grade.