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. s <br /> r` <br /> 1 <br /> ' Golden Grain Company <br /> k January 11 , 1989 <br /> 202/799-5045.01 <br /> SCS returned to the site to ;ge7a11Toeopurposemonitoring <br /> these <br /> wells (MW-5 and MW-51 on May 28, groundwater flow <br /> wells was to establish better datanto�identify on of ethe extent of <br /> " direction, collect additional <br /> ' contamination, and investigate possible off-site hydrocarbon <br /> sources (Appendix III) . <br /> i <br /> Soil samples collected during the drilling of MW-5 and MW-6 <br /> tail <br /> i .. <br /> were analyzed for the same constituents as the sastakensfromen <br /> from the first four wells. ?Done of the soil sampleshydro- <br /> MW-5 and MW-6 showed any detectable concentrations of by <br /> carbons. Water samples taken and analyzed from MW-5 and MW-6 on <br /> 1987 contained 140,000 parts per billion (ppb? and 60 <br /> �r June 8, (Appendix <br /> ppb, respectively, of dissolved gasoline hydrocarbons <br /> V) . <br /> Well elevations of MW-5 and MW--6 were d ter8iaxeirdi e2'Jun9e711, <br /> 1987. Monitoring of groundwater levels on <br /> ed an approximate hydraulic gradient of 1% with an <br /> showthe north. (s drafted by SCS show <br /> )., It should be noted <br /> interpreted flaw direction to <br /> that, in Appendices I through 111, site map <br /> E . <br /> an incorrect North arrow. ) <br /> Details of sampling techniques, <br /> construction methods <br /> monitoring procedures, analyses, and well <br /> outtined in Appendix III. <br /> conducted by SCS are <br /> On December 21 and 22, 1987, the final two monitoring wells <br /> 8 was designed to <br /> (mW-7 and Mw-8) were installed by SCS. - aquifer. <br /> determine downgradient conditions in the water table <br /> provide data on vertical migratory <br /> �. The objective of MW-7 was to p <br /> potential of the hydrocarbons in an alleged "deeper" water system <br /> s <br />