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CA 'MBRIA <br /> �I <br /> • First encountered groundwater is monitored onsite by the existing well network,but deeper <br /> groundwater samples have not been collected at the site. <br /> • Cambria proposes to review the case file for 2315 El Dorado Street, Stockton at SJCEHD's <br /> office. <br /> • Cambria proposes to drill four soil borings to assess the lateral extent of TPHg (and/or PCE <br /> and TCE) and fuel oxygenates in groundwater in the subject site vicinity. Cambria will also <br /> collect groundwater samples below the monitoring wells' screened intervals to assess the <br /> © vertical extent of petroleum constituents beneath the site. <br /> WORK TASKS <br /> File Review Cambria will submit a request to SJCEHD to review the case file for 2315 El <br /> Dorado Street, Stockton, located upgradient of the subject site. Following the file review, <br /> Cambria will submit a work plan addendum if data from the upgradient site indicates that <br /> additional work is warranted. <br /> Permits: Cambria will obtain drilling permits from SJCEHD. <br /> Site Safety Plan: Cambria will prepare a site safety plan for field work. <br /> Utility Clearance: Cambria will mark proposed drilling locations and will clear the locations <br /> through Underground Service Alert prior to drilling. <br /> Site Investigation: Four exploratory soil borings (CPT-1 through CPT-4) are proposed at the <br /> locations shown on Figure 2. Boring CPT-1 will be located cross-gradient of wells MW-1 and <br /> MW-2. Boring CPT-2 is proposed downgradient of MW-2, and borings CPT-3 and CPT-4 are <br /> proposed downgradient of the USTs and well MW-4. <br /> Each of these borings will be drilled to 75 feet below grade (fbg) to log soil types. Soil samples <br /> will be collected from the borings at approximate 10-foot intervals in unsaturated soil and <br /> retained for chemical analyses. Groundwater sampling depths will be determined based on the <br /> soil types encountered. Cambria will target laterally continuous coarse-grained (sandy) zones for <br /> groundwater sampling. To assess the lateral extent of petroleum constituents in groundwater, a <br /> sample will be collected from each boring at a depth between 30 and 50 fbg, corresponding to the <br /> 1641 3 <br />