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30 October 2000 <br /> AGE-NC Project No 99-0624 <br />' Page 2 of 8 <br />' Total petroleum hydrocarbons quantified as gasoline(TPH-g)and total xylenes were detected in soil <br /> stockpile samples composite analyzed at a concentration of 1 5 mg/kg and 0 045 mg/kg,respectively <br /> A summary of soil samples analyzed are presented in Table 1 <br />' Based on analytical data from soil samples collected during the pre-UST removal investigation and <br /> from the UST removal,PHS-EHD directed additional investigation of soil and/or ground water The <br />' PHS-EHD approved by letter dated 07 July 1999 the AGE-prepared Preliminary Site Assessment <br /> WorkPlan dated 30 June 1999 As a result of information collected during the completion ofthe first <br /> phase of the work plan,the PHS-EHD approved by letter dated 01 November 1999 the second phase, <br /> Additional Site Assessment Work Plan Addendum dated 27 October 1999,prepared by AGE <br /> 3.0. PROCEDURES <br /> Tasks and procedures for this investigation were completed in two phases by AGE personnel, or <br />' under the direction of AGE personnel, and were conducted under the supervision of a California <br /> Registered Geologist in accordance with Preliminary Site Assessment WorkPlan dated 30 June 1999 <br />� . and Additional Site Assessment Work Plan Addendum dated 27 October 1999, prepared by AGE <br /> 3 1 ADVANCEMENT OF SOIL PROBE BORINGS -PHASE I <br /> Soil probe borings were advanced using a van-mounted Geoprobe 5400 direct-push probing unit <br />' equipped with 1 25-inch probing rods The Geoprobe advances soil probe borings using a hydraulic <br /> hammer to dnve soil and ground water sampling tools to specified depths <br />' On 23 September 1999, AGE advanced five soil probe bonngs at the site Probe boring P1 was <br /> advanced in the area of the former dispenser island, south of the UST locations to a total depth of <br /> 60 feet below surface grade (bsg) Probe boring P2 was advanced approximately 35 feet west of PI <br />' and the UST area to a total depth of 40 feet bsg A third probe boring,P3,was advanced north of the <br /> UST area to a total depth of approxiinately 7 feet bsg, where refusal was encountered Two <br />' additional probe borings were attempted near P3,both resulted in similar total depths Samples were <br /> collected at five-foot intervals in each probe boring <br /> 32 SOIL AND GRAB GROUND WATER SAMPLE COLLECTION <br /> Discrete soil samples were collected using the Geoprobe push-driven 2-inch diameter soil sampler <br /> fitted with four six-inch long brass sleeves at 5-foot intervals, beginning at 5 feet bsg in all soil <br /> • borings Soil samples were preserved by covering both ends of the second brass sleeve with Teflon <br />' Advanced GeoEnvironmeotai,Inc <br />