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4 <br /> �D � Q0 <br /> CLEARWATER <br /> G R O U P <br /> Enaivoninental Seraices <br /> Table B - Groundwater Sampling Results from October 1 and 5, 2009 <br /> Well Sampling TPH-g B T E X MTBE TBA <br /> Number Date (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) <br /> MW- 1 10/5/2009 100 6.7 12 3.8 8.4 <br /> MW-2 10/5/2009 <50 <0.50 <0.50 <0.50 <0.50 <br /> MW-3 10/1 /2009 <50 <0.50 <0.50 <0.50 <0.50 <br /> MW-4 10/5/2009 <50 <0.50 <0.50 <0.50 <0.50 <br /> MW-513 10/5/2009 8,500 900 130 360 650 <0.50 <5.0 <br /> MW-6 10/5/2009 820 18 17 28 56 <br /> MW-7 10/5/2009 460 <0.50 <0.50 <0.50 0.62 <br /> MW-8 10/5/2009 95 <0.50 <0.50 <0.50 0.64 <0.50 <5.0 <br /> DPW- 1 10/5/2009 157000 51900 260 740 480 0.90 24 <br /> AS- 1 10/5/2009 35,000 5,800 1400 1,900 41300 <0.50 II <br /> IW-3 10/5/2009 11500 96 12 39 52 <0.50 <5.0 <br /> met-- l .o <br /> ESL* 210 46 130 43 1 100 13800 181000 <br /> *Environmental Screening Level for non-beneficial use groundwater. <br /> Values detected in excess of the ESL are in boldface type. &"M f6" I pk'u C-) to O Levi ( <br /> pg/L - Micrograms per liter <br /> - - Not Analyzed or measured <br /> REBOUND EVALUATION <br /> An iso-contour map illustrating the horizontal distribution of benzene concentrations in <br /> groundwater is included as Figure 5 and an iso-contour map illustrating the horizontal <br /> distribution of TPH-g concentrations in groundwater is included as Figure 6. Since April 1 , <br /> 2009, when the iSOCTMS were turned off for rebound testing, the greatest increases in TPH-g <br /> were observed in wells MW-513 (increased from 62 to 8 ,500 µg/L, a 13 ,610% increase), DPW- 1 <br /> (increased from <50 to 15 ,000 µg/L, an increase of at least 29,900%), and AS- 1 (from 7,900 to <br /> 3500 pg/L, a 343 % increase) [Table 3] . The increase in TPH-g observed is most likely a result <br /> of the shutdown of the iSOCTm system for the 6-montb rebound test. <br /> Graphical representations of TPH-g and benzene concentrations in groundwater versus time in <br /> wells MW4 and MW-513 are presented in Figures 7 and 8, respectively. The contaminant <br /> concentrations cross gradient from MW- 1 were below the detection limits for the past six <br /> monitoring events; however, both TPH-g and benzene were detected this quarter in MW- 1 as <br /> shown in Figure 7. TPH-g and benzene also increased considerably in well MW-513 as shown in <br /> Figure 8 . Table C and Table D (provided below) present the percent benzene and TPH-g <br /> changes, respectively, in every sampled monitoring well between February 2009 and October <br /> 2009. <br /> The degree of change due to the lowering of the sampling depth is unknown. <br /> ZB 178N - Barnes Trucking Facility 4 November 2009 <br /> Third Quarter 2009 Quarterly Monitoring Report <br />