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8 <br /> All soil samples were screened for volatile organic compounds using an organic vapor <br />' meter (OVM) As recorded on the geologic borehole logs, OVM measurements were zero <br /> for all of the samples <br />' Fourteen soil samples and accompanying chain-of-custody (COC) forms were <br /> submitted to the state-licensed Curtis & Tompkins, Ltd Analytical Laboratories in Berkeley, <br /> California, for chemical testing These samples were analyzed for total volatile <br /> hydrocarbons as gasoline (TVH-G) using modified USEPA Method 8015, and for BTEX <br />' compounds using USEPA Method 8020 Chemical analytical results are further described in <br /> Section 4 1 <br />' Four soil samples were submitter) to Burlington's materials laboratory in Columbia, <br /> Illinois, for grain size analysis, and hydraulic conductivity testing using ASTM Method D <br />' 5084 (Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a <br /> Flexible Wall Permeameter) Physical test results are further described in Section 4 2 <br /> Five soil samples were submitted to Microbe Inotech Laboratories (MiL) in St 'Louis, <br /> Missoun, for microbiological analysis Tests were performed on these samples to identify <br /> and evaluate microbes, and their capabilities to degrade petroleum hydrocarbons should <br /> biological treatment be utilized as an eventual cleanup method Microbiological test results <br />' are further described in Section 4 3 <br />' 2.3 Groundwater Monitoring Well Installation <br />' Monitoring wells MW-9, MW-11, and MW-12 were constructed with 4-inch- <br /> diameter, Schedule 40 PVC screen and riser Monitoring wells MW-10 and MW-13 were <br /> constructed with 2-inch-diameter, Schedule 40 PVC screen and riser Well risers were <br />' terminated lust below the ground surface, and covered with flush-mount, traffic-rated well <br /> covers <br /> Since groundwater flow at the facility is reported to be toward the northeast, <br /> Monitoring Well MW-9 was placed in a hydraulically upgradient position relative to Rainbo's <br /> former USTs Wells MW-10 and MW-11 were located in cross-gradient positions, and wells <br /> MW-12 and MW-13 were situated downgradient <br /> 04/94/121382/125997/STOCKREP REP/1 <br />