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i1 M) Smith Technology was retained by Mr and Mrs Raymond Fanner to perform a subsurface investigation at the site This work was performed at the request of San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) 2.0 METHOD AND PROCEDURES All work described herein was performed in accordance with Smith Technology's Workplan for Subsurface Investigation, dated May 21, 1997, which was approved with minor modifications by ' PHS/EHD 2_1 Drilling Activities On June 30 and July 1, 1997, Smith Technology personnel supervised advancement of seven soil borings, SBI through SB7, at the site to depths ranging from approximately 40 to 45 feet bgs at ' the project site to 1) investigate the horizontal and vertical extent of petroleum hydrocarbon soil contamination, 2) determine and define soil stratigraphy, 3) install groundwater monitoring wells ' (MWI, MW2, and MW3) within the uppermost aquifer, and 4) install vapor wells (VW1 and VW2) in the vadose zone The boring/well locations are shown on Figure 2 2_2 Soil Sampling and Analysis Drilling was conducted by V & W Drilling (State C57 license no 710678) utilizing a hollow stem auger drill rig A field geologist continuously logged all drill cuttings and cored soil samples utilizing the Unified Soil Classification System (Appendix 1) Descriptions of soil types encountered and sample collection intervals are included on the boring logs (Appendix I) Cored ' soil samples were collected at five toot intervals using a 2-inch diameter split-spoon sampler containing three brass tubes The cored samples and drill cuttings were characterized for soil ' type, moistuie content, and visual evidence of petroleum contamination A flame ionization detection meter (FID) was used as a field screening device for the detection of petroleum hydrocarbon vapors in drill cuttings and cored samples Drill cuttings were stored onsite in 55- gallon DOT approved steel drums pending disposal ' Selected soil were placed on ice, and transported under chain-of-custody to GTEL Environmental Laboratories (DHS #2147) for analysis All soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX), and ' methyl-tertiary-butyl-ether (MTBE) utilizing EPA 8015 and 8020 methodologies, and total lead In addition, soil samples collected from boring SBI were analyzed for total petroleum hydrocarbons as diesel (TPHd), motor oil (TPHmo), and kerosene (TPHk) utilizing EPA methodology 8015, and soil samples collected from borings SB2, SB3, SB3, SB4, and SB7 were analyzed for TPHd, TPHmo, TPHk, volatile organic compounds (VOCs) utilizing EPA methodology 8010, and polychlorinated biphenyls (PCBs) utilizing EPA methodology 8080 The W M73 1 Veportslpsi doe 2 SMTH 1