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i r QUARTERLY REPORT y April 1994 Mid -Cal Leasing 1649 East Channel Street Stockton, California , ' 1.0 INTRODUCTION f, " ��n In accordance with a request from Mr Ed Gotelli of Mid -Cal Leasing (MCL), Geological Audit Services, Inc (GeoAudit) has performed quarterly groundwater monitoring procedures at 1649 East Channel Street in Stockton, California (the site) for the second quarter of 1994 A well survey to assess the distance to production wells for municipal, domestic, agricultural and industnal uses was performed Also included in this report is a_--,! complete history of assessment and; remediation activities at the site ` 2.0 BACKGROUND 2.1 Land Use The site is located in a flat, commercial/liaht industrial area of central Stockton (Figure 1) The site is currently vacant and undeveloped A residential area is located northeast of the site 2.2 Tank Removal, October 1988 It is our understanding that one 8,000 -gallon diesel tank and one 10,000 -gallon diesel tank were removed from the site on October 7, 1988 Soil contamination was encountered dunng the tank removal The contaminated soil was excavated from the former tank cavity The excavated soil was characterized and disposed of at a properly licensed landfill facility On October 7, 1988, a 1,000 -gallon gasoline tank was removed from the site According to a letter from the San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD), soil samples collected from beneath the tank showed detectable levels of total petroleum hydrocarbons (TPH as gasoline at 6,000 ppm) and volatile aromatics (benzene at 115 ppm, toluene at 430 ppm, ethylbenzene at 380 ppm, and xylenes at 1,870 ppm) The location of the former tank excavation is presented as Figure 2 2.3 Depth to Groundwater The depth to groundwater was estimated to be 65 to 70 feet below surface grade, based on i i Gaekpal Ando Servet Inc 1A'L*914 Q -I OR I