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' File No 2070-2 30 November 1913 Page A ' 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 in%Ulficient water in monitoring well MW-2 to collect ' a sample 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 insuffiLient 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 I% 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 rc(,ent sampling for monitoring well MW-4 ' was performed in March 1990 No petroleum hydrocarbons were detected 6) Monitoring well MW-5, located apprommatcly 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 petrolLurn hydrocarbons were detected ' 7) The groundwater Sample C011CLILd 1 i om monitoring well MW-6, Iocated approximately 230 feet noithwest of the piior tank LIU%tei, had no dc:te(,table petroleum hydrocarbons This is consistent .with piior samplings Monitoring well MW-6 is the up-gradient control well 8) Monitoring well MW-7, locatcd appi oximately 100 feet cast 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 dc(ec.tc.d In the May 1990 sample at 3,300 parts per billion ' 9) The groundwater sample collected fiorn monitoring well MW-8, located approximately 170 feet east of the prior tank cluster, had no detectable petroleum hydrocarbons This is consistent with prior saniplings Monitoi ing well MW-8 is a down-gradient control well ' 10) Lead was detected In the groundwater samples collected from monitoring wells MW-1, MW-6 and MW-8 at concentrations of 140, 16 and 16 parts per billion, respectively Prior samplings have detected lead in monitoling well MW-1 However, lead has never been ' detected in monitoring well% MW-6 ,ind MW-8 prior to this current sampling ACG believes the detection of lead in these two wells is likely a result of the low water levels in the wells The low water levels resulted in the introduction of some silt in the water samples The ' detection of lead in the groundwater samples is likely attributable to the presence of silt in the samples The United States Envionniental Protection Agency Primary Maximum Contaminant Level (MCL)l for lead is 15 parts per billion 1 A Coni elation of«atLr QLi llity C41,11% S4_ptut1i.er 1991 %IHIL o] C',ihform i i?egionai w filer Qualnv Control Board Primary MCL for lead for health and human wellare - ANDERSON CONSULTING p GROUP