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PRELIMINARY INVESTIGATION AND EVALUATION REPORT Puregro Company 1904 West Charter way Stockton, California INTRODUCTION In accordance with a request from Mr. James DeMera Of Mullen, Sullivan and Newton (MSN) , Geological' Audit Services, Inc. (GeoAudit) has performed a soil and groundwater investigation of the property located at 1904 West Charter Way (Puregro Company) , Stockton, California (the site) . Four groundwater monitoring wells and one additional soil boring were installed at the site. The location of the site is illustrated in Figure 1. A plan of the site is illustrated in Figure 2 . BACKGROUND Puregro Company operated a fertilizer warehouse facility in a relatively flat area zoned for commercial use in the southern part of Stockton (Figure 1) . It is our understanding that two underground storage tanks (UST's) and related piping were removed from the site in 1990. Both UST's contained unleaded gasoline and were 1, 000 gallons in capacity. Numerous holes were noted in the piping during removal, but the condition of the tanks was not recorded. The excavated soil, which emitted strong hydrocarbon odors, was stockpiled on plastic sheeting. This soil remains on ✓✓site. No samples have been collected from the stockpile for laboratory analysis. Four soil samples were collected from the tank excavation and removal and analyzed for total petroleum hydrocarbons as gasoline (TPH-g) and volatile aromatic hydrocarbons (BTE&X) . All samples contained detectable concentrations of TPH-g, ranging from 1100 mg/kg to 5000 mg/kg. All samples also contained BTE&X compounds (see report by Weston Consultants, dated 29 March 1990) . Geological Audit Services, Inc. was retained to assess the 4teral and vertical extent of contamination at the site. No monitoring wells were reported to be located on the property. However, during the assessment a single 2-inch monitoring well (designated MW-5v was discovered on the property approximately 200 feet southeast of the former tank excavation. The well was found to have a total depth of approximately 20 feet. No record of well permitting or installation was available from the San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD) concerning MW-5. However/a review of PHS/EHD files indicated that a single 6, 000-gallon diesel UST was removed from the area in June of 1987 by Western Meter. No analytical