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0 • <br /> CAMBRIA <br /> Work Tasks <br /> Permits An appropriate permit for drilling will be obtained from SJCPHS/EHD <br /> Health and Safety Plan A site-specific Health and Safety Plan will be prepared for field <br /> work <br /> Utility Clearance Proposed drilling locations will be marked and their locations cleared <br /> through Underground Services Alert (USA) prior to drilling <br /> Site Investigation Four exploratory soil borings (GP-3 through GP-6) are proposed in the <br /> vicinity of the dispenser islands and product piping at the locations shown on Plate 2 These <br /> borings will be drilled in areas where petroleum hydrocarbons were detected during the 1994 <br /> tank removal and/or in locations with the potential to be source areas As these locations are <br /> beneath the existing canopy, we cannot use a cone penetrometer testing (CPT) drilling rig <br /> and will drill the borings with a GeoProbe rig <br /> Field evidence such as soil staining, odor, and photo-ionization detector (PID) measurements <br /> will be evaluated in each boring to determine if the boring was placed in a source area If the <br /> boring location is identified as a source area, the boring will be advanced until there is no field <br /> evidence of petroleum hydrocarbons or MTBE in order to delineate the vertical extent of <br /> these constituents If there is no field evidence of petroleum hydrocarbons or MTBE within <br /> 10 feet of the surface, then the boring is not in a source area and will be terminated <br /> As Equilon Enterprises LLC has no plans to remove the existing USTs, it is not feasible at <br /> this time to collect soil samples from beneath the UST complex During the January 1999 <br /> investigation, Cambria drilled four exploratory soil borings (SBA through SB-4) adjacent to <br /> the UST complex and no source area was identified To determine whether the UST complex <br /> is a source area, Cambria proposes installing three groundwater monitoring wells (MW-1 <br /> through MW-3) at the locations shown on Plate 2 Cambria proposes to install one well <br /> adjacent to the product piping between the dispensers and the UST complex, one well north <br /> of the UST complex, and the third well south of the UST complex <br /> Groundwater data from these wells will allow us to establish an onsite groundwater flow <br /> direction and identify the general location of the source area The well borings will be drilled <br /> to 10 feet below first-encountered groundwater using hollow-stem auger equipment <br /> i <br /> 241-0955 3 <br />