SITE INFORMATION AND CORRESPONDENCE_PRE 2019

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MPI Label Systems, Inc. facility, and approximately 15 gallons of solvent wastes stored at the Sweets Tinware facility. These solvent wastes are removed from the site every 90 days by a licensed hazardous waste hauler. Information on historical quantities of solvent wastes generated on site is not available. The EHD has been working with the site owner to remediate the petroleum hydrocarbon groundwater contamination beneath the site. To determine whether the contents of the USTs had impacted groundwater beneath the site, the site owner installed four monitoring wells on site between 1988 and 1994. Since 1993, three of the monitoring wells have been sampled every quarter by a contractor to the site owner. Analytical results of groundwater samples collected from the onsite monitoring wells have indicated the presence of total petroleum hydrocarbons, benzene, toluene, ethylbenzene, xylene, and halogenated volatile organic compounds. In addition, halogenated volatile organic compounds were detected in an onsite domestic well in 1993. As a result, the domestic well was taken out of service. As part of remedial activities pertaining to the petroleum hydrocarbon contamination on site, the site owner has installed a vapor extraction well and is in the process of submitting a soil remediation plan to the ER]). Domestic wells in the vicinity of the site are screened in a shallow aquifer that occurs between approximately 40 feet below ground surface (bgs) and 175 feet bgs. The population multiplier for the domestic wells in the Stockton area is 3.3. It is estimated that 29 domestic drinking-water wells serve approximately 95 people within 4 miles of the site. The nearest active domestic well is less than 0.25 mile from the site. Municipal wells in the vicinity of the site are screened in a deeper aquifer. The nearest municipal drinking-water well (Well 79-01), less than 0.25 mile from the site, is screened between 298 feet and 498 feet bgs. The log of Well 79-01 indicates that a 20-foot-thick clay layer, which may be present beneath the site, separates the shallow aquifer and the deeper aquifer. The depth to groundwater beneath the site is approximately 80 feet bgs. The groundwater flow direction in the vicinity of the site is to the northeast. Surface water runoff from the site flows into the Stockton Diverting Canal, approximately 1 mile from the site. The Canal flows into the Calaveras River, which flows into the San Joaquin Delta. There are no drinking-water intakes within 15 miles downstream of the site. Although there are fisheries and sensitive environments within 15 miles downstream of the site, none is in the vicinity of the site. A majority of the site is covered by buildings or pavement, and the site is surrounded either by a fence or a wall. No schools or daycare centers are on site. The following pertinent Hazard Ranking System factors are associated with the site: Hazardous substances stored on site are limited to two 55-gallon drums and approximately 15 gallons of solvent wastes stored on a paved area on site. Domestic wells within 4 miles of the site are screened in a shallow drinking- water aquifer which serves a population of approximately 95 people. Municipal drinking-water wells in the vicinity of the site are screened in a deeper aquifer. The log of Well 79-01 (located less than 0.25 mile from the site) indicates a 20- foot-thick clay layer, which may be present beneath the site, that separates the shallow aquifer and the deeper aquifer. In addition, none of the municipal drinking-water wells in the vicinity of the site is contaminated with hazardous substances attributable to the site. PA Marlowe Property-SS • 6/95 8 Printed on 50% recycled paper.