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' CJeofy%u 'Iec(mres Inc Page 7 Soil Groundwater Investigation Report George s Service Project No 425 2 IAugust 5, 1997 . Domestic Wells o The well log for the domestic well located at 1600 Durham Ferry Road was obtained The well is 230 feet deep and is screened from 170 to 230 feet below ground surface The geology is alternating sand/gravel and clay layers ranging from approximately 10 to 20 feet thick This geology was not very consistent with that found in MW-8 or MW- 102, 65 and 115 feet away respectively o A well log was obtained for the domestic well located at 31448 Highway 33, the Muriel Jones Propoerty The well is 96 feet deep but the well log does not give information on perforation depth The geology is listed as being primarily alternating layers of gravel and clay o A well log was not obtained for the domestic well located at 1697 West Durham Ferry Rd GTI tried both the California Department of Water Resources and San Joaquin County However the property owner, Milton Birkhahn, claimed to be familiar with the well construction and told us that it was 100 feet deep and screened from 80 to 100 feet below ground surface ISee Appendix B, Boring Logs, Domestic Well Logs and Figure 3, Cross Section for More information A complete well survey report will be submitted upon completion of the survey Additional well drillers logs are being searched at DWR 3.4 Waste Disposal On July 26, 1997, eight 55 gallon drums of soil stored on plastic were transported to Forward Landfill in Stockton Manifest documents are included in Appendix E On July 17, 1997, fifteen 55 gallon drums of drilling decon water, well purge water and water and free product generated during bailing of MW-2 were transported to Advanced Environmental in Fontana, CA Manifest documents are included in Appendix E 4.0 CONCLUSIONS AND REC®1MIl+JN DA'll'20NS Based on our interpretation of the data collected over the course of this subsurface investigation we have reached several conclusions These conclusions are based on the premise that the data we considered, although incomplete, are representative of actual site conditions We acknowledge that there may be undiscovered conditions, which would upon their consideration, change our interpretation and thus our conclusions Our recommendations are based on our knowledge of site conditions and the state and limitations of subsurface investigative technology 4.1 Conclusions Geological Technics Inc , taking into consideration the data obtained during previous site investigation work and the April 29 & 30, 1997 soil and groundwater investigations, makes the following conclusions Subsurface lnvesti ag tion The following conclusions are made based on our professional interpretation of the field observations made during the completion of the soil borings, well installation, and soil and groundwater sample test data