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Geologi"al reclrnicslac Page 8 <br /> ' Groundwater Monitoring Report <br /> Project No 425 2 <br /> November 8,2005 <br /> 1 <br /> Zone A: <br /> ' • Laboratory results are summarized in Table 7 <br /> o MW-1 and MW-5 show the presence of MtBE <br /> o MW-1, MW-4, MW-5 and MW-8 show the presence of low to moderate levels of <br /> ' BTEX and TPH-G constituents <br /> o MW-2 shows the presence of elevated concentrations of BTEX and TPH-G <br /> constituents <br /> ' o MW-3, MW-6 and MW-7 were non-detect above laboratory reporting limits for <br /> all analyzed constituents <br /> • Figure 8 shows contours of TPH-G concentrations in Zone A <br /> © Chart 1 shows the average TPH-g and Benzene historical variations in MW-1 <br /> o Benzene concentrations reached a peak in 2000 <br /> o TPH-G concentrations peaked in 2002 <br /> ' ® Chart 2 shows the average TPH-g and Benzene historical variations in MW-2 <br /> o Benzene concentrations reached a peak in 1999 <br /> o TPH-G concentrations peaked in 2001 <br /> ' ® Chart 3 shows the average TPH-g and Benzene historical variations in MW-8 <br /> o Benzene concentrations peaked in 1998, 2001 and 2004 <br /> o TPH-G concentrations were relatively flat until 2004 <br /> o TPH-G concentrations are currently at there peak (2005) <br /> o MW-8 appears to be seeing the lateral spread of contan-enation from Former USTs <br /> ' Number 1 and 2 <br /> o If the current TPH-G peak seen in MW-8 is related to the TPH-G peak seen in <br /> MW-2 in 2001, it would suggest the contamination is moving approximately 20 <br /> ' feet per year <br /> o At this rate it is likely MW-7 will show benzene impact by early 2006 and TPH-G <br /> influence by summer of 2006 <br /> ' c At this rate it is likely MW-6 will show benzene impact by summer 2006 and <br /> TPH-G impact by early 2007 <br /> ' Zone B: <br /> o Laboratory results are summarized in Table 8 <br /> MW-2X and MW-101 were non-detect above laboratory reporting limits for all <br /> ' analyzed constituents <br /> 0 MW-106 shows the presence of MtBE below MCL's MW-106 was non-detect <br /> above laboratory reporting limits for all other analyzed constituents <br /> ' Zone C & Zone D• <br /> ' a Laboratory results are summarized in Table 9 <br /> • MW-102 and MW-201 were non-detect above laboratory reporting limits for all <br /> analyzed constituents <br /> • MW-107 and MW-202 were not sampled during this monitoring event <br /> 1 <br />