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P.O. Box 576981-6981 M.J. Kloberdanz & Associates Modesto, California 95357 Environmental Assessment Phone: (209) 577-8186 Fax: (209) 577-8158 McDowell & Davis Towing 1360 Escalon Avenue, Escalon, California Quarterly Groundwater Sampling Report February 2002 s l NARRATIVE On February 1, 2002 M.J. Kloberdanz & Associates, in conjunction with GeoAnalytical Laboratories, Inc., conducted quarterly groundwater monitoring of the McDowell & Davis Towing site at 1360 Escalon Avenue, Escalon, California. Quarterly monitoring activities consisted of depth to water and water characterization measurements, well purging, groundwater sample collection and laboratory analysis of water samples collected from the three groundwater-monitoring wells at this site. Depths to groundwater measurements were obtained and the wells monitored for floating product before purging of the wells. Each well was evacuated of at least three well volumes by means of a steam-cleaned, stainless steel bladder-type pump. During the purging of the wells, field pH, electrical conductivity, and temperature measurements were monitored to verify well stability and to insure that representative groundwater samples were collected. Once well stability was achieved, groundwater samples were collected. Field data sheets are presented in appendix B. The groundwater samples were labeled and placed in an ice chest cooled with blue ice or crushed ice and then logged on a Chain of Custody form and delivered to GeoAnalytical Laboratories, Inc., a state certified laboratory, located in Modesto, California. The water samples were analyzed for BTEX, MTBE and the Oxygenated Compounds including EDB and 1,2 DCA (EPA Method 8260B) and gasoline range petroleum hydrocarbons (EPA Method 5030, GCFID). All of the water samples were checked in the laboratory for dissolved oxygen concentrations by Method SM4500-0 G. SUMMARY FINDINGS Groundwater was present at approximate depths of 62.3 to 62.9 feet below ground surface at the McDowell & Davis Towing site on February 1, 2002, a rise of approximately 0.3 feet over the November monitoring event.