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3 <br /> A S S O C I A T E S I N C <br /> Laboratory analyses detected concentrations of one or more petroleum hydrocarbon constituents <br /> in the samples collected from wells MW3 and MW4 The water sample collected from well MW4 <br /> reported benzene at 28 parts per billion (ppb) which is above the 1 ppb California Primary <br /> Maximum Contaminant Level (MCL) for drinking water Groundwater samples collected from <br /> wells MW2, MW5, and MWb and the Supply Well contained no detectable concentrations of <br /> BTEX or TPHg These analytical results are generally consistent with historical levels Analytical <br /> results are summarized in Table 1 Laboratory reports and chain-of-custody documentation are <br /> presented in Attachment 2 <br /> If you have any questions regarding this project, please contact Tom Lutterman at our Modesto <br /> office (209) 579-2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> Tom J Lutterman <br /> • Project Geologist <br /> �D l <br /> OHNE <br /> E7:lV � <br /> Jeanne Hornsey, P E j a No. r «7410 � <br /> CA Registered Civil Engineer No C 47410 Exp —1&122 <br /> CIVIL <br /> Attachments 0Ir �?,L1 <br /> Table 1 Summary of Groundwater Monitoring and Analytical Results <br /> Figure 1 Site Location Map <br /> Figure 2 Groundwater Gradient Map <br /> Attachment 1 Well Purge Logs <br /> Attachment 2 Laboratory Data Sheets and Chain of Custody <br /> cc Ms Donna Gardner <br /> Al Hoslett, Esq <br /> Mr Ron Rall, SJC Utilities Maintenance <br /> Ms Pat Anderson, RWQCB - Central Valley Region <br /> Ms Teresa Trmh, SWRCB - Cleanup Fund <br /> • <br /> w 1943261quad1y\1gr-1998 doe 4 <br />