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Geological Audit <br /> g ud t Services, LTH <br /> Geolo <br /> Environmental ProfessionalsNNW <br /> 1803 W.March Lane,Suite A•Stockton,CA 95207•(209)956 02� %1*Ak(209 56- 7 <br /> January 19, 1994 <br /> (GeoAudit 792-S) <br /> Mr. Alfred Caldron <br /> 12750 West Byron Road <br /> Tracy, CA 95376 <br /> Subject: Soil Excavation - Caldron's Market <br /> 12750 West Byron Road, Tracy, CA <br /> Dear Mr. Caldron: <br /> At your request, Geological Audit Services, Inc. (GeoAudit) has supervised the excavation <br /> of petroleum-contaminated soil at 12750 West Byron Road, Tracy, California. <br /> Excavation took place from November 30 to December 1, 1993. A backhoe and operator <br /> were supplied by Stokley Construction of Tracy to perform the excavation. Excavation was <br /> centered in the area of the former underground storage tanks (UST's) which were removed <br /> in 1991. A photo-ionization detector (PID) was used to screen the excavated soil for the <br /> presence of volatile hydrocarbon vapors and direct the backhoe. Excavation was terminated <br /> when no vapors were detected. The depth of the excavation was approximately 7 feet. At <br /> the direction of Mr. Steve Sasson of the San Joaquin County Public Health Services / <br /> Environmental Health Division (PHS/EHD), five soil samples were collected from the <br /> sidewalls of the excavation and analyzed for total petroleum hydrocarbons(TPH) as gasoline <br /> and volatile aromatics (BTE&X). Sample N-1 was also analyzed for TPH in the diesel and <br /> motor oil range. No contamination was detected in any of these samples. The soil sample <br /> locations are shown on Figure 1. Water was encountered during excavation and stabilized <br /> at a depth of 6 feet. One water sample was collected from the excavation and analyzed for <br /> TPH as gasoline and BTE&X. <br /> Soil from the excavation was stockpiled in three piles of approximately 50 cubic yards each <br /> near the rear of the property. One sample was collected from each of the stockpiles and <br /> analyzed for TPH as gasoline and BTE&X. Hydrocarbons were detected in all three <br /> stockpiles. Laboratory results of soil and water samples are summarized on Table 1. The <br /> PHS/EHD will probably require remediation of this contamination before allowing the soil <br /> to be replaced in the excavation. Groundwater also appears to be impacted, and the <br /> PHS/EHD will require a groundwater assessment. <br /> ` Full Spectrum Environmental Services• Hydrogeology <br />