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•CAMBRIA <br /> Periodic groundwater extraction is currently being performed at the subject site on a monthly <br /> basis A vacuum truck is used to extract groundwater from monitoring wells and a UST <br /> complex backfill well A total of approximately 5,000 gallons of groundwater is extracted <br /> per event and this water is transported to the Martinez Refining Complex where it is <br /> recycled To date, approximately 48,000 gallons of groundwater has been extracted through <br /> this program Calculations based on this volume and groundwater analytical data from the <br /> wells suggest approximately 27 pounds of MTBE have been recovered from beneath the site <br /> WORK PLAN <br /> Technical Rationale for Proposed Scope of Work <br /> • Methyl tertiary butyl ether (MTBE) has been detected in monitoring wells at this site <br /> • The highest concentrations have been detected in well MW-IA, which is the most <br /> downgradient well at this site <br /> . • The vertical extent of MTBE in groundwater beneath this site is not known <br /> • Further assessment of the lateral and vertical extent of MTBE in groundwater beneath <br /> this site is warranted <br /> • Cambria proposes one cone penetrometer testing (CPT) boring (CPT-1) be drilled <br /> adjacent to MW-IA to assess the vertical extent of MTBE in groundwater in soil and <br /> groundwater This boring is located in the area where the highest concentrations of <br /> MTBE have been detected in groundwater <br /> • Cambria proposes five groundwater monitoring wells be installed to further assess the <br /> lateral extent of MTBE in groundwater Four of the wells are located north, northeast, <br /> and east of the site to assess the down/crossgradient extent of the plume One well is <br /> proposed southwest of the UST's as an upgradient well The well locations are shown on <br /> Figure 2 <br /> • The work proposed in this work plan is designed to adequately define the lateral and <br /> vertical extent of MTBE in the soil and groundwater beneath this site if the results of <br /> this investigation indicate further assessment is warranted we will propose additional <br /> • investigation <br /> 0813 3 <br />