ARCHIVED REPORTS XR0000091 - Laserfiche WebLink

Home Browse Search

File No 2070 2 23 March 1994 Page 3 ' The groundwater sample collected from monitoring well MW-8 had no noticeable odor, discoloration or floating product ' 5 0 Groundwater Sample Results Groundwater samples from monitoring wells MW-1, MW-6 and MW-8 were submitted to Curtis & ' Tompkins for analysis for constituents noted in Section 3 0 The laboratory data indicates that petroleum hydrocarbons as gasoline were detected in the groundwater sample collected from monitoring well MW-1 at a concentration of 67,000 parts per billion (ppb) No petroleum ' hydrocarbons were detected in the groundwater samples collected from monitoring wells MW-6 and MW-8 ' Lead was detected in the groundwater sample collected from monitoring well MW-1 at a concentration of 4 5 ppb Lead has been detected fairly consistently in this well during prior samplings, due likely to the presence of dissolved petroleum hydrocarbons (leaded gasoline) in this ' well No lead was detected in the groundwater samples collected from monitoring wells MW-6 and MW-8 ' Table II presents the results of the laboratory analyses Figure 2 illustrates the locations of the monitoring wells A copy of the laboratory data is included in Appendix 1 6 0 Disposition of Puraed Well Water Groundwater purged from the monitoring wells was contained in a 55-gallon drum and stored on the site Following receipt of the analytical data, the purged water will be disposed under Uniform ' Hazardous Waste Manifest as a RCRA hazardous waste liquid 7 0 Conclusions ' The following conclusions are based on data obtained during the fourth quarter 1993 sampling as well as prior samplings 1) The local flow direction of the groundwater was determined to be toward the northeast with a gradient of 0 0019 furl This is consistent with the east/northeast flow directions ' calculated for prior samplings 2) The groundwater sample collected from monitoring well MW-1, located in the center of the prior tank cluster, had 67,000 parts per billion petroleum hydrocarbons as gasoline No diesel fuel or motor oil was detected Gasoline has been detected in this well during prior samplings at similar concentrations 3) The groundwater in monitoring well MW-2, located approximately 70 feet southwest of the prior tank cluster, had a moderate petroleum hydrocarbon odor No discoloration or floating product was noted There was insufficient water in monitoring well MW-2 to collect a sample j ANDERSON CONSLiL7iNG GROUP