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1710 Main Street <br />Escalon, CA 95320 <br />Phone (209) 838-3507 <br />FAX (209) 838-3509 <br />January 21, 1994 <br />Ms Linda Turkatte <br />San Joaquin County Public Health Services <br />Environmental Health Division <br />P O Box 2009 <br />Stockton, CA 95201 <br />Working To Restore Nature <br />Subject Soil Excavation Report, Corrigan Property, 620 San Juan Avenue, Stockton, CA <br />Dear Ms Turkatte <br />This letter report is submitted to summarize excavation activities conducted at the above referenced <br />site (Figure 1) The excavation was performed to remove hydrocarbon impacted soil associated with <br />underground fuel storage tanks formerly located on the subject site <br />SITE BACKGROUND <br />On May 27, 1986, hydrocarbon contamination of soil and groundwater were noted during the <br />removal of two 1,000 -gallon steel underground fuel tanks at the subject site One tank contained <br />regular gasoline and the other contained diesel fuel (Figure 2) <br />Soil and groundwater samples were collected from the bottom of the tank pits during tank removal <br />Laboratory analyses determined that both soil samples contained detectable concentrations of total <br />petroleum hydrocarbons as gasoline (TPHg), 75 parts per million (ppm) and 960 ppm, respectively <br />Groundwater samples collected from the tank pits also contained gasoline hydrocarbons The <br />laboratory results of the initial investigation are shown on Table 1 <br />On March 25, 1991, WaterWork Corp supervised the drilling of five soil borings on the subject site, <br />three of which were completed as groundwater monitoring wells (MW1, MW2, and MW3) with <br />maximum depths of 25 to 27 feet below grade Soil borings SBI and SB2 were drilled to a depth <br />of seven feet in the former diesel and gasoline tank pit, respectively Soil encountered beneath the <br />project site consisted primarily of elastic silt (MH) and lean clay (CL) to approximately 27 feet below <br />grade, the maximum depth explored An apparent sand (SP) lens was noted in soil boring MW2 <br />from approximately 17 to 21 feet below grade Strong to moderate product odors were noted in soil <br />borings MW2, SBI and S132 Groundwater was encountered at a depth of approximately 11 5 to 12 <br />_Am feet below grade during field activities Analyses of collected soil samples detected petroleum <br />SXR1293 DRF <br />