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First Quarter 1992 Groundwater Monitoring Report ��_A"A <br />• Comgan Property, Stockton, California <br />June 5, 1992 <br />Laboratory analyses determined that all three wells contained nondetectable concentrations of <br />BTEX, TPHG, and TPHD. Laboratory reports with chain -of -custody documents are presented <br />in Attachment 2 Table 2 summarizes laboratory results since March 1991 <br />Groundwater samples collected during the March 1991 sampling event determined the presence <br />of petroleum hydrocarbons in the upgradient monitoring well, indicating a possible off site <br />source An environmental record search was conducted of available federal, state, and county <br />records to help determine possible off site sources. Three saes were identified as possible <br />sources A more detailed examination of available County records was conducted and found to <br />be inconclusive <br />The necessary drilling permits for additional investigation have been submitted for approval to <br />the San Joaquin County Public Health Services When approval is granted, field activities will <br />be scheduled with the County at least 48 hours in advance As requested by the San Joaquin <br />County Environmental Health, second quarter groundwater samples will also be laboratory <br />analyzed for total lead <br />If you have any questions or need any additional information regarding this project, please <br />• contact me at (209) 838-3507 <br />Respectfully, <br />RESNA Industries <br />• <br />Tina Le Page <br />Project Manager <br />Gregory P Stahl <br />CA Registered Geologist No 5023 <br />cc Ms Zona Corrigan <br />Mr Lee Helms, Cyr Realtors <br />Mr G L Boggs, CARWQCB <br />Attachments <br />ORO4O392 TLP <br />