Laserfiche WebLink
1.0 INTRODUCTION <br />This report is being submitted on behalf of Mrs Zona Corrigan to present a summary of the soil <br />and groundwater contaminant assessments at 620 San Juan Drive, in Stockton, California (Figure <br />1) and to propose remediation alternatives for soils on the site which have been impacted by <br />petroleum hydrocarbons The report provides background information, summarizes results of <br />recent investigations, and outlines a proposed Soil Contamination Workplan (SCW) for the <br />impacted soils <br />2.0 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 (u/g) fuel tanks at the project site One tank <br />contained regular gasoline and the other contained diesel fuel (Figure 2) <br />Soil and groundwater samples were collected from the bottom of the tank pit during tank <br />removal. Laboratory analyses determined that both soil samples contained detectable <br />concentrations of total petroleum hydrocarbons as gasoline (TPHG), 75 parts per million (ppm) <br />and 960 ppm, respectively. Groundwater samples collected from the tank pit also contained <br />gasoline hydrocarbons. The laboratory results of the initial investigation are shown on Table <br />1 <br />1 <br />On March 25, 1991, WaterWork Corp supervised the drilling of five soil borings on the subject <br />' site, three of which were completed as groundwater monitoring wells (MW1, MW2, and MW3) <br />with a maximum depth of 25 to 27 feet below grade Soil borings SBI and SB2 were drilled <br />' to a depth of seven feet in the former diesel and gasoline tank pit, respectively. Groundwater <br />was encountered at a depth of approximately 11 5 to 12 feet below grade during field activities. <br />Analyses of collected soil samples detected petroleum hydrocarbon constituents in soil borings <br />MW2 and SBI at respective depths of 10 5 and 5 feet below grade Only xylene was detected <br />' in soil boring MW2 at 0 009 ppm, marginally above the detection limit of 0 005 ppm (Table 1) <br />�� PAR -0393 FNL 1 <br />