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Me Mary Meays � <br /> 01 San Joaquin County Public Health Services <br /> May 8, 1992 <br /> Laboratory Analysis <br /> Groundwater samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX), and <br /> total petroleum hydrocarbons as gasoline (TPHG), by EPA methods 8020 and modified 8015, <br /> respectively Laboratory analyses detected elevated concentrations of petroleum hydrocarbons <br /> in the samples collected from wells MW2, MW3, and MW4 Well MW5 contained 95 ppb total <br /> petroleum hydrocarbons as gasoline, however no volatile constituents were detected The <br /> analytical results are summarized in Table 2 The laboratory data sheets and chain-of-custody <br /> documentation are presented in Attachment 2 <br /> The lateral extent of the dissolved contaminant plume associated with the former underground <br /> fuel storage tank has been essentially defined, except in the vicinity of well MW4, north of the <br /> former tank With only two rounds of groundwater samples collected from this well, it is <br /> unclear whether contamination at MW4 can be attributed to the former tank or from a potential <br /> off-site contributing source. In accordance with the San Joaquin County Public Health /Services <br /> request, groundwater beneath the site will continue to be monitored on a quarterly basis <br /> Recommendations, if appropriate, will be presented in quarterly monitoring reports The next <br /> sampling event should be completed by June 30, 1992, and the subsequent monitoring report <br /> submitted by July 31, 1992 <br /> If you have any questions regarding this project, please contact John Lane at our Escalon office <br /> (209) 838-3507 <br /> Respectfully, <br /> RESNA Industries <br /> 2 n P Lane <br /> Project Geologist <br /> Gregory P Stahl <br /> CA Registered Geologist No 5023 <br /> ATTACHMENTS Table 1 Summary of Groundwater Monitoring <br /> Table 2 Summary of Laboratory Analysis <br /> Figure 1 Groundwater Gradient (03/04/92) <br /> Figure 2 Groundwater Gradient (03/16/92) <br /> Attachment 1 Well Purge Logs <br /> Attachment 2: Lab Data Sheets and Chain of Custody <br /> pc. Mr. Al Hoslett, Wilson, Hoslett & Whitridge <br /> Mr Jim Maughan, RWQCB <br /> QR032692 JPL 2 <br />