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y / <br /> M.J. Kloberdanz & Associates P.O. Box 5 ✓/ <br /> Modesto, Californiaia 9 953535 <br /> Mod7 <br /> Environmental Assessment Phone: (209) 577-8186 <br /> Fax: (209) 577-8158 <br /> ° E� � <br /> JAN 10 zooMcDowell & Davis Towing <br /> RM�T�SE v�C4360 Escalon Avenue, Escalon, California <br /> PE <br /> Quarterly Groundwater Sampling Report <br /> November 2002 <br /> NARRATIVE <br /> On November 11, 2002 M.J. Kloberdanz & Associates, in conjunction with <br /> GeoAnalytical Laboratories, Inc., conducted quarterly groundwater monitoring of the <br /> McDowell & Davis Towing site at 1360 Escalon Avenue, Escalon, California. Quarterly <br /> monitoring activities consisted of depth to water and water characterization <br /> measurements, well purging, groundwater sample collection and laboratory analysis of <br /> water samples collected from the three groundwater-monitoring wells at this site. <br /> Depths to groundwater measurements were obtained and the wells monitored for floating <br /> product before purging of the wells. Each well was evacuated of at least three well <br /> volumes by means of a steam-cleaned, stainless steel bladder-type pump. During the <br /> purging of the wells, field pH, electrical conductivity, and temperature measurements <br /> were monitored to verify well stability and to insure that representative groundwater <br /> samples were collected. Once well stability was achieved, groundwater samples were <br /> collected. Field data sheets are presented in appendix B. <br /> The groundwater samples were labeled and placed in an ice chest cooled with blue ice or <br /> crushed ice and then logged on a Chain of Custody form and delivered to GeoAnalytical <br /> Laboratories, Inc., a state certified laboratory, located in Modesto, California. The water <br /> samples were analyzed for BTEX, MTBE and the Oxygenated Compounds including <br /> EDB and 1,2 DCA (EPA Method 826013) and gasoline range petroleum hydrocarbons <br /> (EPA Method 5030, GCF1D). All of the water samples were checked in the laboratory <br /> for dissolved oxygen concentrations by Method SM4500-0 G. <br /> SUMMARY FINDINGS <br /> Groundwater was present at approximate depths of 64.06 to 64.65 feet below ground <br /> surface at the McDowell & Davis Towing site on November 11, 2002, a fall of <br />