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GEOMATRIX <br /> boundary. Concrete slabs for former buildings,possibly the heater house and pump house, are <br /> located at the north comer of the property (Figure 2). A short section of removed pipe was <br /> observed aboveground outside of the southeast corner of the property(near ASB-7) within the <br /> railroad right-of-way. The pipe section was approximately 10 feet long and 4 to 6 inches in <br /> diameter. Construction material and former use of the pipe are unknown. Evidence of <br /> petroleum hydrocarbons was not observed inside or immediately adjacent to the pipe. The <br /> Arcos property is currently used to store trailers and other large equipment. <br /> A water supply well is located near the north corner of the property. The current tenant is only <br /> aware of this one well on the site; the well construction records are unavailable. According to <br /> the tenant, water from the well is piped to the on-site office trailer and used for washing <br /> lpurposes and not for drinking water. <br /> 3.3 FIELD AND ANALYTICAL METHODS <br /> } Based on the results of the focused site assessment(described in Section 3.2), 12 areas of <br /> } potential environmental concerns were identified for sampling(Figure 2): <br /> Soil Boring Location/Description <br /> ASB-1 Former pump house and underground piping <br /> ASB-2 Former heater house and underground piping <br /> 1 ASB-3 Former piping manifold and former tank storage area <br /> u ASB-4 Former OVP <br /> ASB-5 Former sump, underground piping, and geophysical anomaly <br /> ASB-6 Former east bulk storage tank and underground piping <br /> ASB-7 Former OVP <br /> ASB-8 Former rubbish pit <br /> ASB-9 Former center bulk storage tank and geophysical anomaly <br /> lj< ASB-10 Underground piping <br /> . ASB-11 Former incinerator area <br /> ASB-12 Former south bulk storage tank and underground piping <br /> Prior to conducting the field investigation activities, Geomatrix notified USA to perform an <br /> underground utility clearance at each boring location and obtained a boring permit from <br /> Stanislaus County (Appendix A). <br /> Soil sampling, grab groundwater sampling, water supply well sampling, and analytical methods <br /> are described in Sections 3.3.1, 3.3.2, 3.3.3, and 3.3.4,respectively. <br /> I:TROIECRSOWO\SOI I.OW0 501 I-o3.doc 14 <br /> l <br />