ARCHIVED REPORTS_XR0005829 CASE 1

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Mr Michael Infurna Project 20805-151-004 August 25, 2000 Page 2 UST REMOVAL ACTIVITIES On April 29, 1999, a Pinnacle geologist was on-site to observe the excavation and ' removal of the three USTs The USTs had been previously exposed, pumped dry, inerted with dry ice, and prepared for removal Randy Sutton of the City of Manteca Fire Department gave his approval to remove the USTs Michael Kith of the San Joaquin County Environmental Health Division (SJCEHD) was on-site to observe the removal activities The USTs appeared to be in good condition with no holes, cracks, or pitting observed Slight damage was observed on the ribbed section of USTs 1 and 2, both at approximately 6 feet from the fill end The damage appeared to be old and not done during the removal of the USTs UST 2 appeared to be slightly stained with gasoline from overfill at the fill end of the UST The USTs were transported by Fuller Excavation and Demolition of Rancho Cordova, California, to Erickson of Richmond, California, for disposal Four 4-inch-diameter observation wells, located in each corner of the northern UST complex were removed intact during the excavation activities The observation wells were replaced with two new 4-inch-diameter observation wells located in the northeast and southwest corners of the new UST complex The wells were screened from approximately 5 feet below ground surface (bgs) to the total depth of the UST complex (approximately 17 feet bgs) Groundwater encountered at the base (17 feet bgs) of the northern UST excavation was ' not sampled Stockpiled material (SP-2 through SP-6 and SP-10) from the UST complexes was sampled and analyzed, and the SJCEHD approved the material for use as backfill in the southern UST complex SAMPLING AND ANALYSIS On April 21, 1999 Pinnacle collected stockpile samples SP-1 (4-point sample) and SP-2 (two-point sample) from pea gravel and soil removed from the UST complexes In addition, samples T-1, T-2, and T-3 were collected from water removed from the three USTs Water samples were identified based on previous tank designations, however, ' UST designations were later modified by the SJCEHD representative as follows UST 1, 2, and 3 designations were changed to UST 2, 3, and 1, respectively Figure 1 shows the modified UST designations SAC 111SACRFPI ICOMMON1Consultmgldatz\Shared\Projects\PJ010805108051510 4zz doc-Mit I (804141 00008)