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1: �i samples respectively. This data was summarized in Precision Industries' July 12, 1989 letter (Appendix B) . No TPH or BTX&E . compounds were detected. Upon discovery of the total lead within the soil sample, organolead analysis was run on sample T-1 west. No organolead was detected within this sample. { To date, authorization has not bec:i received by the Local stealth Departme;at to backfill the excavation. 3.0 Depth to Groundwater Since no site specific depth to groundwater information is available, three information sources were utilized in determining the depth to groundwater at the Laura Scudders Tracy Plant. The first information source was the California Regional Water Quality =Control. Board's (CRWQCB) information for the site inves- tigation of the former Georgia Pacific site located at 75 W. Valpico Road, which is situated less than 1/2 mile north of the Laura Scudders Plant. Through discussions with Mr. David Brent of the CRWQCB, WESTON ;gas advised that the depth to groundwater at the Georgia Pacific site ranges from 58' to 65' beneath the ground surface (BGS) . The second information source utilized was monitoring well installation logs contained in public records on file with the CRWQCB for the Triple "E" Produce site in Tracy, California. This site is located less than one mile southeast of the Laura Scudders Plant. These well logs; contained in Appendix c, indicates that the depth to groundwater at the Triple '"E" rite is between 58' and 62' beneath the ground surface. The final informational source utilized in determining the depth to groundwater was the San Joaquin County Flood control and Water Conservation District - Lines of Equal Elevation of Water in Wells for both Fall 1988 and Spring 1989. From this source, it was found that the depth to groundwater in the area of the Laura Scudders Tracy Plant ranges from 62' beneath the ground surface in the Fall 1988 to 60' beneath the ground surface in the spri,.g. of 1989. I From these three informational sources, it can be assumed with i_ reasonable assurance that the depth to groundwater beneath the Laura Scudders Tracy Plant ranges from 58' to 62' BGS. #�a Therefore, since the deepest samples collected during the tank ' - removal efforts were at a depth of 20' BGS, there exists, at a minimum, 38' of strata between the lowest soil sample data and the water bearing zone. 4.0 Review of Findings and Recommendations WESTON has .reviewed all of the available data and information regarding the closure of the three tanks at the Laura Scudders Tracy, California facility. The data, when compared to appropri-.