Laserfiche WebLink
@�ad <br /> ggp <br /> 64 <br /> KLEINFELDER <br /> The highest PID readings for soil remaining in the excavation were along <br /> the south and southeast walls at survey points 44 (44 ppmv) and 46 (80 <br /> ,= ppmv). Soil samples collected from these survey points were analyzed to <br /> get a conservative estimate of the TPH concentrations remaining in the <br /> )t€ soil. Survey point 44 had a TPH concentration of 22 mg/kg, and survey <br /> '• point 46 had a TPH concentration of 30 mg/kg. Benzene was below <br /> Inhoratory reporting limits in both samples. <br /> E � <br /> Based on the results of the PID field screening and laboratory <br /> confirmation samples, the petroleum hydrocarbon contaminated soil has been <br /> successfully removed from the excavation. The highest remaining TPH <br /> j concentration detected was at survey point 46 (30 mg/kg). Survey point 46 <br /> rg is approximately one foot from the city sidewalk and the excavation can <br /> not be advanced further south. The remaining .TPH concentrations are very <br /> low and benzene was not detected in any of the samples. <br /> stir � <br /> ti x The ' four round water monitoring onztorang wells will provide future assessment of <br /> the excavation area as necessary. Based on the results of this soil <br /> s. j <br /> s removal investigation, Kleinfelder recommends The Customer Company obtain 4 <br /> ri authorization from the SnHD to install new underground tanks. - <br /> ' 5.2 SOIL PILES <br /> yy <br /> V. <br /> ! _ <br /> Results of the. PID screening and composite samplingindicate the largest <br /> .. <br /> soil pile (300 to 350 cubic yards) has a TPH concentration of 126 to 220 <br /> mg/kg. The smaller„ clean soil pile (30-50 cubic yards) has a TPH <br /> 'j concentration of 14 mg/kg. Benzene was below reportin,,- limits in the <br /> composite samples -from-both-piles— <br /> A: <br /> romboth_piles. - - - <br /> The large soil pile will <br /> require :controlled aeration according to San. � <br /> g <br /> Joaquin County Air Pollution Control District (,APCD) guidelines. With <br /> }� APCD's' .approval, the soil will be aerated onsite or at Forward Landfill in <br /> Stockton. once the soil has been aerated below 100 mg/kg, the soil will <br /> i be used as :'intermediate or daily cover:at Forward Landfill according to <br /> RWQCB guidelines. <br /> �'4 102-8&-638 3 <br />