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TPHG was detected in 5 of the 10 sampled monitoring wells at concentrations ranging from <br /> M� 260 µg11 (MW-3) to 7,600 µg/l (S-1). Benzene was detected in 3 of the 10 sampled monitoring <br /> wells at concentrations ranging from 22 µg/l (MW-8) to 440µg/1 (S-1). MTBE was detected by <br /> ' USEPA Method 8260 in 7 wells at concentrations ranging from 0.87 µg/l (MW-5) to 10,000 µg11 <br /> (S-1). TBA was detected in well S-1 at a concentration of 1,300 µg/l. No other oxygenates were <br /> detected. Analytical data are summarized in Table 1 and illustrated on Figure 3. Certified <br /> Analytical Reports and chain of custody documentation are presented in Appendix B. <br /> ' 5 CONCLUSIONS <br /> ' Groundwater samples from 7 of the 10 sampled monitoring wells (MW-3, MW-4, MW-5, <br /> MW-7, MW-8, S-1, and S-2) contained detectable concentrations of petroleum hydrocarbons. <br /> ' Highest detected concentrations were reported in well S-1. The lateral extent of MTBE impacts <br /> are generally defined and off-site concentrations do not exceed 5 µg/l_ Groundwater flowed <br /> toward the south-southeast and southwest during the fourth quarter 1999. <br /> i <br /> ' The material and data in this report were prepared under the supervision and direction of the <br /> undersigned. <br /> ' IT Corporation IT Corporation <br /> Davidoley M k Capps,R.G. 6� <br /> ' Project Manager Pr 'ect Geologist <br /> 1 <br /> sAC1111SACAFPI1COMMON\ConsultingldatalSharedTmjects1P171792055.bs.doc-001it:1 IT comoRnon <br /> 2 <br /> 1 <br /> a*,y, <br />