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Glen Resufts Report - Soil and Ground Water Investigation g° March 1996 (9647-0011) ' - — — — Ground water samples were collected through the hollow-stem augers from each of the borings and analyzed for TPH-g and BTEX The laboratory analysis detected the highest I concentrations of TPH-g and BTEX in the soil sample(s) collected from soil boring SBA Based on these results, RAH Environmental concluded that the source of the petroleum hydrocarbons found in soil boring SBA most probably came from the former UST on the Lopez property The ' analytical results are presented in Table 2, Summary of Results of Analyses Ground Water Samples - Previous Investigations ' METHODS OF INVESTIGATION Soil Sample Collection IOn February 5 and 6, 1996, Fugro supervised the advancement of four 8'/4-inch-diameter drill holes (MW-1, MW-2, MW-3, and SB-A 1) and one 4'/2-inch-diameter drill hole (SB-A2) at I the locations shown on Figure 2 The drill holes were advanced to depths ranging from 20 5 feet below grade surface (bgs) to 35 5 feet bgs using a truck mounted drilling rig equipped with hollow stem augers Soil samples were collected at five-foot intervals, beginning at five feet below grade to the total depth of each The earth materials encountered were geologically logged and soil cuttings monitored for volatile organic compounds with a photolonization detector (PID) by a project geologist under the guidance of a State of California professionally registered geologist Soil cuttings were containerized in approved Department of Transportation (DOT) 55-gallon drums and stored IUndisturbed soil samples were collected using a modif=ied California split-spoon sampler during the advancement of each drill hole in accordance with the California Code of Regulations ' (CCR), Title 23, Subchapter 16, Article 4, Section 2645 Soil samples were collected in 2 5-Inch- diameter by six-inch-long brass sample sleeves, sealed with teflon sheets and plastic caps, labeled, and placed in a cooled ice chest pending delivery to PACE Inc Soil samples were analyzed for TPH-g by EPA Method 8015M and BTEX by EPA Method 8020 I Drill holes MW-1, MW-2, and MW-3 were completed as two-inch-diameter ground water monitoring wells to depths of approximately 18 feet bgs Boring logs and well construction details are presented in Appendix A Ground Water Sample Collection I Monitoring Well Development. Monitoring wells MW-1, MW-2, and MW-3 were developed on February 7, 1996 (at least 24 hours after installation) using a disposable hand bailer until ground water appeared clear and free of sediment Approximately 20 gallons of water were Iremoved from each well The well development water is temporarily being stored onsite in DOT- 96470011 396 OT- 96470011396 2