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%ftaf <br /> 4 <br /> *� 3.0 SITE INVESTIGATION <br /> 3.1 SITE WALK <br /> Before drilling, Earth Tech performed a site walk through to mark the location of the <br /> proposed borehole. Underground Safety Alert was contacted to mark the underground <br /> v utilities in the area of the proposed borings. No utilities were identified that conflicted with <br /> the proposed drilling locations. <br /> +.. 3.2 SITE-SPECIFIC HEALTH AND SAFETY PLAN <br /> A site-specific Health and Safety Plan (HSP) was prepared by Earth Tech as required by the <br /> �. Occupational Health and Safety Administration Standard "Hazardous Waste Operations and <br /> Emergency Response" guidelines (29 CFR 1910.120). The Health and Safety Plan was <br /> reviewed and signed by Earth Tech personnel and subcontractors performing work at the <br /> j,. site before field operations began. A copy of the HSP was on-site during all site activities. <br /> Equipment specified in the HSP was operational and readily available at the site for <br /> personnel under Earth Tech's direct or technical supervision. <br /> 3.3 SUBSURFACE INVESTIGATION <br /> Earth Tech planned to advance one direct push soil boreholes, as described in Table 3, and <br /> shown on Figure 2. <br /> TABLE 3 <br /> HSA Borehole Schedule <br /> BOREHOLE LOCATION DEPTH COMMENTS <br /> B-1 Centered at Former UST 22'BGS The borehole was advanced to 22'BGS,as groundwater was <br /> encountered between 20 and 22'BGS. <br /> ` One grab groundwater sample was collected with a cleaned <br /> stainless steel bailer. <br /> r <br /> Groundwater was encountered at 21 feet BGS in Borehole B-1 . <br /> The borehole was advanced using a 2-inch outer diameter, stainless steel direct push rod, <br /> advanced with hydraulic pressure and the weight of the drill rig. <br /> Soil samples were collected continuously in 2-foot long acetate sample sleeves, which <br /> were removed at 4-foot intervals. The middle six inches of the acetate tube were cut <br /> Iwo away, and the soil was used to describe the soil lithology and screen the soil for volatile <br /> organic compounds (VOCs). The sample tubes were then capped, labeled, and refrigerated <br /> prior to transport to a California-certified laboratory. <br /> Each soil sample collected in the field was screened for VOCs using an Organic Vapor <br /> Analyzer (OVA). The soil samples were logged using the Unified Soil Classification System <br /> +.. (USCS) by an Earth Tech field scientist working under the supervision of a California <br /> 3 <br />