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. Farmer Unocal Service Station/0187 <br /> October 9, 1995 <br /> Well Development <br /> Groundwater monitoring wells U-4 through U-7 were developed on July 24, and well U-8 <br /> was developed on July 31, 1995. Development was performed by Gettler-Ryan Inc (G-R) <br /> of Dublin, California Well development procedures are presented in Appendix A Well <br /> development field data sheets are presented in Appendix C Water generated during <br /> development procedures was discharged to properly labelled drums and which were stored <br /> at the site pending disposal <br /> Well Monitoring and Sampling <br /> Newly installed groundwater monitoring wells U-4 through U-8 were monitored and <br /> sampled by G-R on July 31, 1995 Depth to groundwater was measured and the wells <br /> checked for the presence of floating product prior to purging and sampling Floating <br /> product was not present in any of the wells These groundwater data are summarized in <br /> Table 1 Groundwater monitoring and sampling procedures are presented in Appendix A <br /> Groundwater removed during well purging was discharged to properly labelled drums and <br /> stored at the site pending disposal MPDS will incorporate the newly installed groundwater <br /> monitoring wells U-4 through U-8 into the quarterly monitoring and sampling program <br /> i� beginning with the fourth quarter 1995 <br /> Wellhead Survey <br /> Following installation of the wells, the casing elevations were surveyed by Virgil Chavez <br /> Land Surveying of Vallejo, California (license #6323) Top of casing and vault box <br /> elevations were measured relative to MSL, and the horizontal locations of the wells <br /> measured Well casing elevations are included on Table 1 These data have been <br /> forwarded to MPDS for inclusion in their Quarterly Monitoring Reports A copy of the <br /> surveyor's report is included in Appendix D <br /> RESULTS OF SUBSURFACE INVESTIGATION <br /> Soil Conditions <br /> Soil encountered beneath the site consists predominantly of clay to approximately 40 feet <br /> bgs Discontinuous strata of sand (approximately four to 12 feet thick) were encountered <br /> in all borings to approximately 22 feet bgs, except in well borings U-O and U-7 The clay <br /> is underlain by sand from approximately 40 feet bgs to the total depth explored of <br /> approximately 55 feet bgs This sandy unit was not encountered in boring U-6 <br /> 482704-3 5 <br />