ARCHIVED REPORTS XR0000091 - Laserfiche WebLink

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File No 2070-2 23 March 1994 \ Page 4 ' 4) The groundwater in monitoring well MW-3, located approximately 200 feet northeast of the prior tank cluster, had no noticeable odor, discoloration or floating product There was insufficient water in monitoring well MW-3 to collect a sample With the exception of a ' sample collected in September 1987, prior samplings have failed to detected petroleum hydrocarbons in this well Monitoring well MW-3 is a down-gradient control well 5) Monitoring well MW-4, located approximately 100 feet northwest of the prior tank cluster, was dry at the time of our sampling The most recent sampling for monitoring well MW-4 was performed in March 1990 No petroleum hydrocarbons were detected ' 6) Monitoring well MW-5, located approximately 70 feet southeast of the prior tank cluster, was dry at the time of our sampling The most recent sampling for monitoring well MW-5 ' was performed in March 1990 No petroleum hydrocarbons were detected 7) The groundwater sample collected from monitoring well MW-6, located approximately 230 ' feet northwest of the prior tank cluster, had no detectable petroleum hydrocarbons This is consistent with prior samplings Monitoring well MW-6 is the up-gradient control well 8) Monitoring well MW-7, located approximately 100 feet east of the prior tank cluster, was ' dry at the time of our sampling The most recent sampling for monitoring well MW-7 was performed in May 1990 Gasoline was detected in the May 1990 sample at 3,300 parts per billion 9) The groundwater sample collected from monitoring well MW-8, located approximately 170 feet east of the prior tank cluster, had no detectable petroleum hydrocarbons This is Iconsistent with prior samplings Monitoring well MW-8 is a down-gradient control well 10) Lead was detected in the groundwater sample collected from monitoring well MW-1 at a concentration of 4 5 parts per billion Prior samplings have also detected lead in monitoring well MW-1 No lead was detected in the groundwater samples collected from monitoring wells MW-6 and MW-8 8 0 Anticipated Further Action-, Analysis of subsurface conditions is being performed to evaluate the best remedial options for maximizing the effectiveness of a groundwater treatment system Following completion of the analysis, a Final Remediation Plan (FRP) describing the installation and operation of a treatment ' system will be submitted As of this letter, a date for beginning preparation of the FRP has not yet been determined Until an FRP is submitted, quarterly sampling of the groundwater quality will continue ANDERSON '1 CONSULTING V GROUP