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CAMBRIA <br /> Technical Rationale for Proposed Scope of Work <br /> • The lateral extent fuel oxygenates in groundwater has not been completely assessed <br /> • Quarterly groundwater monitoring data indicate that all onsite wells are impacted by fuel <br /> oxygenates and that offsite investigation is warranted <br /> • Seven groundwater monitoring wells (MW4 through MW-10) are proposed to <br /> investigate the extent of petroleum hydrocarbons and fuel oxygenates in groundwater <br /> Work Tasks <br /> Permits: Appropriate permits for drilling will be obtained from SJCPHS/EHD Shell will obtain <br /> access agreements for the Park and Ride lot west of the subject site and the property south of the <br /> site <br /> Site Safety Plan: A Site Safety Plan will be prepared for field work <br /> Utility Clearance: Proposed drilling locations will be marked and their locations cleared through <br /> Underground Service Alert prior to drilling <br /> Site Investigation: Seven groundwater monitoring wells (MW4 through MW-10) are proposed <br /> at the locations shown on Figure 2 The purpose of these wells is to evaluate the extent of <br /> petroleum hydrocarbons and fuel oxygenates in groundwater The borings will be dnlled with <br /> hollow-stem auger drilling equipment and will be converted to groundwater monitoring wells <br /> Well MW-4 is proposed near the USTs to assess impact to groundwater in the presumed source <br /> area Wells MW-5, MW-b, and MW-7 are proposed onsite, near the property's north, northeast, <br /> and southeast boundaries, respectively Wells MW-8 and MW-9 are proposed in the Park and <br /> Ride lot, west of the site, and well MW-10 is proposed in the field south of the site Wells <br /> MW-5 through MW-10 will assess the lateral extent of petroleum constituents in groundwater <br /> A Cambria geologist will supervise the drilling and descnbe encountered soil using the Unified <br /> Soil Classification System and Munsell Soil Color Charts Soil samples will be collected at five- <br /> foot intervals for description, possible chemical and physical analyses, and organic vapor <br /> screening with a photo-ionization detector (PID) PID readings will be recording on the boring <br /> log for each well <br /> 0955 4 <br />