Laserfiche WebLink
An additional groundwater sample was collected from MW-I on <br /> February 25, 2003 to confirm results measured in the February 5, 2003 <br /> sample BTEX concentrations in the additional sample were measured <br /> at 160 pg/l, 45 µg11, 230 pg/l, and 1,500 pg/l, respectively The <br /> 1 benzene concentration in the additional sample was higher than <br /> originally measured, however, the other three compounds were l <br /> relatively lower <br /> Higher TPH-G concentrations are similarly situated near the former <br /> gasoline USTs (Figure 7) TPH-G concentrations were measured in the <br /> MW-1, MW-7, MW-12, SP-1, SP-2, SP-4, SP-6, PZ-1 and PZ-2 <br /> samples ranging from 220 pg/l to 28,000 pg/1 (in MW-1) The <br /> additional February 25, 2003 sample from MW-1 contained a TPH-G <br /> concentration of 14,000 pg/I , which is lower than originally measured <br /> The laboratory indicated that TPH-G concentrations measured in the <br /> MW-12, SP-4 and SP-6 samples did not match the typical gasoline <br /> standard r <br /> Review of current analytical data indicates that BTEX and TPH-G <br /> 1 concentrations in the groundwater sample from MW-1 are somewhat <br /> higher than those measured during the past three quarters of <br /> monitoring Current concentrations in the MW-1 sample, particularly <br /> of BTEX concentrations, remain significantly lower than historic <br /> highs Current TPH-G and BTEX concentrations continue to remain <br /> relatively stable, showing significant decreases from historic?highs, in <br />' samples collected from SP-1, SP-2, PZ-1 and PZ-2 <br /> X90 . <br /> 23.2 February 2003 Oxygenates Conditions <br /> Current DIPE concentrations display general decreases since the <br /> installation of new sparging well SP-A DIPE was detected in samples <br /> collected from wells MW-7, MW-8, MW-12 and PZ-1 at <br /> concentrations of 41 pg/l, 4 µg11, 4 2 pg/l and 3 5 pg/l, respectively <br /> (see Figure 8) Oxygenate compounds TBA, MTBE, ETBE and <br /> TAME were not detected in groundwater samples collected in <br /> February 2003 <br /> 2.3.3 Biodegradation Parameters <br /> Soil samples, collected during a subsurface investigation performed in <br /> March 1994, were evaluated for total heterotrophic plate count <br /> (microbial identification and characterization) and their ability to <br /> degrade fuel hydrocarbons Results of these analyses were first <br /> 12 <br /> Remedial Action Completion Report <br /> The Earthgrams Company Facility <br /> 2651 South Airport Way <br /> Stockton California <br /> Prepared for THE EARTHCRAINS COMPANY Prepared by Philip Services Corp <br /> H TNV1624001321I21382EG1Stodion�StacktonUtemedialCompleuon Repon ci c April 14 2003 <br />