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SENT BY: BROSAMER & WALL, LLC; 025 820 3184; MAY-16-M 1 :14PM; PAGE 8 <br /> 2.0 SOIL AND GROUND WATCR SAMPLING <br /> 2.1 Field Activities <br /> 2.1.1 Preliminary Subsurface Investigation <br /> On May 6,2003, seven test borings were advanced by Vironex, Inc. (Vironex; San i_.eatidrc-,, <br /> California) under the direction of a California Registered Environmental Assessor -ll. The borings <br /> were specifically designed to sample die subsurface. The targeted areas of concerti are. shows. on <br /> Drawing 2 and include: <br /> - One boring was advanced within the location of the former one-story truck repair <br /> shop and storage building (south west portion of the subject site within the <br /> perceived down gradient position) (SB-1). SB-1 was located within the Perceived <br /> _- dawn gradient position of the subject site. <br /> • 'Three borings were advanced within the location of the miscellaneous buildings and <br /> associated aboveground storage tanks (southern portion of the subject site') (SB.-2, <br /> SR-3 and SB 7). SB-7 was located within the perceived up gradient positicm of the <br /> subject site. <br /> • Two borings were advanced within the location of the former one-story oil house <br /> and designated gas and oil area (north west portion of the subject site) (SB-4 and <br /> SR 5)- SB-4 was located within the perceived down gradient position of the subject <br /> site. <br /> • One boring was advanced within the location of the former private one-story auto <br /> repair shop building (north east portion of the subject site) (S13-6). SB-6 was <br /> located within the perceived up gradient position of the subject site. <br /> These locations were intended to provide subsurface chemistry data regarding the potential <br /> of inadvertent discharges of typical hazardous materials associated with past construction and <br /> paving operations. No geologic interpretation was performed during this phase of assessment. <br /> 'I"he Sampling locations were marked at the site in white paint and cleared by 11-S-A- prior to <br /> drilling activities. Vironex utilized GeoprobeO 5400 Direct Penetration Technology (DPT) drilling <br /> methods. DPT uses dry impact methods to drive: boring tools into the subsurface. A soil sanipic <br /> was collected in 2-inch diameter,five foot steel continuous core sampler. Polyethylene terephthalate <br /> glycol (PE'I'(3) soil liners were utilized within the inner sample barrel. PET(:, soil liners are <br /> - transparent and inert to petroleum hydrocarbons. metals, solvents, pesticides and most hazardous <br /> materials (except high levels of phenols). After advancing both the drive-casing and sample barrel 5 <br /> feet, the sampler was retracted, and the sample removed. Selected samples then were tie<rlect and <br /> PHAS17 11-02 2-1 02.ENV002S <br />