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P.O. Box 576981 <br /> M.J. KIoberdanz & Associates Modesto, California 95357-6981 <br /> Environmental Services Phone: (209) 577-81.86 <br /> Fax: (209) 577-8158 <br /> McDowell & Davis Towing <br /> 1360 Escalon Avenue, Escalon, California <br /> Quarterly Groundwater Sampling Report <br /> January 2003 MAR 14 2003 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> NARRATIVE <br /> On January 20, 2003 M.J. Kloberdanz & Associates, in conjunction with GeoAnalytical <br /> Laboratories, Inc., conducted quarterly groundwater monitoring of the McDowell & <br /> Davis Towing site at 1360 Escalon Avenue, Escalon, California. Quarterly monitoring <br /> activities consisted of depth to water and water characterization measurements, well <br /> purging, groundwater sample collection and laboratory analysis of water samples <br /> 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 8260B) and gasoline range petroleum hydrocarbons <br /> (EPA Method 5030, GCFID). 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 63.22 to 63.81 feet below ground <br /> surface at the McDowell & Davis Towing site on January 20, 2003, a rise of <br />