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F+�i ry r <br /> September 4, 1997 <br /> Page 3 <br /> 4. <br /> tank and construction debris from the former UST pit, and limited of over-excavation in <br /> the UST pit A summary of findings include the following <br /> • Petroleum hydrocarbons were detected in the southeast comer of the <br /> former UST complex at concentrations up to 4,000 ppm TPH-g CA A r <br /> Concentrations remaining after over-excavation ranged from <br /> nondetect in perimeter samples to 2,300 ppm TPH-g in Sample T-8 at <br /> 23 feet bgs Benzene was nondetect in all of the samples collected <br /> r' <br /> The TPH-g impacted area was defined horizontally to nondetect <br /> • Material removed and stockpiled during the excavation of the former <br /> gasoline UST pit consisted of approximately 380 cubic yards of <br /> impacted soil and approximately 200 yards of concrete debris <br /> • No petroleum hydrocarbons were detected in the soil samples <br /> collected from beneath the former waste oil storage tank and former <br /> product lines <br /> • As approved by San Joaquin County Environmental Health Division <br /> (SJCEHD), material excavated from the waste oil tank pit was reused <br /> as backfill in the waste oil tank excavation Excavated debris and soil <br /> . from the former gasoline US F pit was disposed of offsite <br /> • No new utilities were placed in the original excavations and the site <br /> has been backfilled and graded <br /> SC'OPF OF WORK <br /> I lie scope of work completed included the following <br /> • On tMdy 23 and 27, 1997, Boring B-7 was drilled within the southeast portion of the <br /> footprint of the former UST pit (at the location of Samples C-t and T-8) where the <br /> htghest concentrations of gasoline hydrocarbons in soil was teported during <br /> ercavatton activities <br /> • Soil samples were collected at 5-toot intervals from Boring B-7 Photo-ionization <br /> detector (PID) was used to field analyze the samples, PID measurements are shown <br /> on the boring log Attachment B Groundwater ' grab" samples were collected from <br /> Boring B-7 using a disposable bailer as described in Attachment A <br /> • Selected soil and groundwatet samples were submitted to a California State-certtfied <br /> lttboratoiy and analyzed Cot the piesenLL of I PH-g, BTEX compounds and lead <br /> SUMMARY OF FINDINGS <br /> . ",Ub;uriacc soik conditions at J3otiii<o 11-7 W11M tLd ptiniat}I} of ,tltti ,and <br /> (rioundwater was encoutiteied ata depth of appro\imately 58 feet bgs I he log tot <br /> Iletin`, B-7 i,, piesented w, Attac IMILnt 13 <br /> �T(I 0 1 it�ti(,wRPR i <br />