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Diamond Lodi,CA-November 1993 Groundwater Monitoring Page 5 TABLE 2: Analytical Groundwater Data .November 25, 1991 April 7, 1992 September 1,1992 February 4, 1993 June 28,1993 November 29,1993 SRK- SRK- SRK- SRK- SRK- SRK- SRK- SRK- SRK- SRK- SRK- SRK. SRK- SRK. SRK- SRK- SRK- SRK- " "W1 t*M NM3 MW1 MW2 MW3 MWl NfW2 MW3 MW rtM MW3 R1WI MW2 MW3 NTWI. AlW2 MW3 Valatilr �0 c50 <50 <50 <50 <50 <20 NS QO QO QO Q0 Q0 QO QO Q4 �0 QO Hydrocarbons Benzene <0.5 <0.5 <0.5 <05 <0.5 <0.5 <0.5 NS <0.5 <0.3 0.3 <0.3 <0.5 <0.5 10.5 <0.5 10,5 <0.5 Toluene <0.5 0.82 0.63 m.5 <0.5 <0.5 <0.5 NS <0.5 <0.3 <0.3 <0.3 <1.5 <0.5 <0.5 <0.5 <0.5 <0.5 Ethylbenzene <0.5 <0.5 �.5 <0.5 <0.5 <03 <0.5 NS <0.5 <0.3 <0.3 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 IXylenes <0.5 <0.5 <0.5 �.5 10.5 <0.5 W.5 NS <0.5 <0.3 <0.3 + <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 Lead 53 <0.5 <03 33 260 93 12 NS 170 3 59 122 <1 18 <1 1 5 80 40 NATES: NS = Not sampled because of slow recharge after purging resulting in an insufficient quantity of water necessary for sampling. ND = Analytes reported as ND were not present above detection limits. All units in ppb. 5.2 Historic Soil Data Analytical soil samples were collected in conjunction with the Phase II Environmental Audit performed by SRK during November 1991 under the direct guidance of the San Joaquin County PHS/EHD. The Phase II investigation included the installation of three groundwater monitoring wells to evaluate subsurface soil and groundwater conditions near the former location of two USTs which were removed in 1985. Analytical soil samples were collected during the installation of each monitoring well (SRK-MWI, SRK-MW2 and ' SRK-MW3) at depths of 30 feet (seasonal high groundwater level), and 50 feet (capillary fringe). The constituents of Volatile Hydrocarbons, BTEX, and Lead were not detected in any of the soil samples. 1 6A REGULATORY COMPLIANCE Ms. Margaret Lagorio, Senior REHS with the San Joaquin County PHS/EHD was on-site during the sampling of monitoring wells SRK-MW 1 and SRK-MW2. Ms.Lagorio left the site before monitoring well SRK-MW3 was sampled. Monitoring wells SRK-MW I, SRK-MW2, and SRK-MW3 were sampled in accordance with San Joaquin County PHS/EHD guidelines. Laboratory samples were sent via over-night courier to a California Certified Laboratory. A copy of the chain-of-custody is provided with the laboratory data in Appendix C. I7.0 SUMMARY OF FINDINGS Monitoring wells SRK-MWI, SRK-MW2 and SRK-MW3 have been sampled during each quarterly sampling event (November 1991, April 1992, August 1992, February 1993, June 1993, and November 1993). Analytical results from the November 1993 sampling event indicate that organic components of gasoline are absent from the site and that remnant lead concentrations appear to fluctuate which may be the 325a.M642Uiytad Steffen Robertson and Kirsten