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Lodi Ready Mix Report-Soil Boring Installwn Project No. 93.1 August 2, 1993 Page 5 3.2 Site Hydrology The exact depth to groundwater at this site is not known at this time. However, it may be approximately at a depth of 55 feet below ground surface (reference- San Joaquin County Flood Control and Water Conservation District Map Lines of Equal Depth to Water in Wells Spring 1989 attached as Figure 3). 3.3 Hydrocarbon Distribution in the Soil tSoil samples were collected while drilling S13-1. This data combined with the results of the stockpile soil sample are summarized and shown below as Table I. Copies of the laboratory analytical reports are attached as Appendix A. tThe da-a,sheet-s show:that tl-es mpl`es were nadverten_tiv tested-for-TPH �Ga oline�of_whch all_re us Its were negative. . Table 1 Soil Analytical Data Date Sample Benzene Tolucne Ethvibenzene xylene TEPH u /k u /k /k /kg mg/kg 07/06/92 26.5-27.0' ND (<5.0) ND (<5.0) ND (<5.0) 1.NO (<5.0) I NO (<5/50) 07/06/92 31.5-32.0' ND (<5.0) ND (<5.0) ND (<5.0) 1 ND («.0) ND (<5/50) 07/06/92 36.5-37.0' ND (<5.0) ND (<5.0) ND (<5.0) ND (<5,0) NO (<5/50) 07/06/92 141.5-42.0' i ND (<5.0) ND (<5.0) VD (<5.0) ND («.0) i ND (<5/50) .- L07/06/921 Soil Pile .1 ND (<5.0) ( ND (<5.0) ND (<5.0) : (ND (<5.0) 66* motor oiI ND=not detected (detection limits in parentheses) r_ch-_emi-5Y rep_o-eted 7 Ma-t{rh-ech•romatogra n `67 ed,a7-veat_ered"diesel anel=zvas-reported- motor-oil 4.dUALITY ASSURANCE Q C PROGRAM The following measures were taken by Geological Technics Inc. to ensure that a high quality study was conducted and that cross contamination sloes not l occur. 4.1 Equipment Soil borings were drilled with a 7.25 inch (o.d.) hollow stern continuous flight auger, owned and operated by Osterberg and Stewart, Inc. (C.57 license # 446670). Soil samples were collected using`a 2.5 inch (i.d.) modified California split spoon sampler lined with brass sample using a continuous coring g {