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P4 'Vag _ sITh . s c i i ggl MEMO- i VMSSSSOWTF.S Jack Ficri 6 27 May 1987 " 'These four phases revealed that hydrocarbon concentrations were E increasing with depth below the 1,000-gallon gasoline tank. Soil sample L-2, 3 ft below the bottom of the tank, contained 750 ppm TFHC. Soil sample L-3, 2.5 ft below L-2, contained 1,000 ppm TFHC. Soil samples SJMB2/A, 22 ft below L-2, and BH31, 6 ft below SJMB2/A, contained 3,800 ppm and 3,300 ppm TFHC, respectively. There was no evidence of a leak in the gasoline tank or the 130 piping, or in any of the other tanks or piping. Soil boring L-1 contained ppm TFHC 2 ft below the 8,000-gallon weed oil tank, but SJMB1/A, approximately 133.1 ft below L-1, was below detection. _f the San nuin Local Heal'zh District To meet the requircmeftts -_._ 3_a-. (SJLHD), three ground water monitoring wells were installed to determine ^' ground water flow direction ar_d gradient and to determine if hydrocarbons were �- present in ground water beneath the site. The work per for this phase of the project is described below. WELL INSTALLATION AND SUBSURFACE CONDITIONS Wells MW-1, F4W-2 and MW-3 were installed on 17, 18 and 19 December 1986 respectively, by Joseph Theiscn, WA geologist, using 10.5-in. OD, 6-in ID hollow-stem augers operated by !.H. Kleinfelder and Associates' Drilling Division, Stockton, California. Well locations were selected based on tank W locations, estimated ground water flow direction and site access. Monitoring well locations are shown in Figure 2. Borehole stratigraphy and well a n the boring logs in Attachment A. completion details are shown o s The boreholes were logged from cuttings and drive samples. The drive stratigraphy and relative permeability were samples used . to document soil collected in an unlined 2.0-in. ID California modified drive sampler. Soil samples for chemical analysis were collected in a brass tuolasticlined cease ~ -sampler. The samples were capped with aluminum foil and p p hermetically sealed with duct tape, labeled, refrigerated and transported atories under chain-of-custody fora:_ :o,-row and Caldwell Analytic labor of Emeryville, California. The augers and drive steam-cleaned d sampler were r.