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QUARTERLY REPORT - January 1995 Art S Artists ' 204 East Lodi Menue Lodi, CA 1.0. INTRODUCTION In accordance with a request from Mr. James DeNlera of Mullen, Sullivan & Newton, Advanced GeoErivironmental, Inc. (AGE) has prepared this Quarterly Report of ground water monitoring activities for the first cparter of 1995 at 204 East Lodi Avenue in Lodi, California (Figure 1 - Location Map). A more detailed neap, including the locatiorrof the monitoring wells, is depicted in Figure 2 - Site Plan. 2.0. BACKGROUND ' The presence of hydrocarbon release was detected following the removal of a single 550- gallon gasoline underground storage tank in 1957. Total petroleum hydrocarbons (TPH-g) was detected at a concentration of 1,400 m2AR: toluene was detected at a concentration of 2i0 rnall:g: and xylenes were detected at 1S mg`kg in soil samples. Subsequently, the San Joaquin County Public Health Services - Environmental Health Dl%,ision (PI-iS/EI-ID) required furtherinvestigation at the site to ine if ground water Enid beers impacted by the release. Three soil boringswere drilled in July 1957 and completed as MW-1, 'MNV-2, and 1.1W-3 by Weiss Associates (NVA). The results of this investigation indicated that the impacted soil was limited to the vicinity of the former tank. Petroleum hydrocarbons %were detected in ground water samples from all three wells. The analytical results implied that gasoline migration through the soil was primarily downward to around water where it migrated laterally to the capillary fringe. Initially, the ground water gradient was east-northeast, probably in response ' to drawdownillLodi Municipal Well #1, wll,ich \.-as located approximately 350 feet east of the site. Lodi Mcnricipal Well #1 was abandoned ill 1991. ' In November 1991, Earth Systems Environmental (ESE) reported that water levels had dropped below the screened intervals ill MW-2 and MW-3 and that floating product was present ill MW-1. However, the product thickness in MW-1 was riot reported by ESE. The depth to water ill MW-1 in 1991 was 60.12 feet. In-January 1992, PHS/EHD required replacement of MW-2 and MW-3. it4onitoring wells -. )JW-4 and MW-5 were installed by Geological Audit Services Inc- (GeoAuclit) iia JiirteT 1992. No petroleum hydrocarbons were detected in any of the soil samples during drilling ' of those wells. However, low to moderate concentrations of hydrocarbons were detected in water samples from-both MW-4 and MW-5. .[Ocie to low water levels, none of the other wells could be sampled in June 1992. The prevailing ground water flow direction was to the southwest, in accord with the regional gradient.