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r <br /> P.O. Boa 576981-6981 <br /> M.J. Kloberdanz & Associates Modesto, California 95357 <br /> Environmental Assessment Phone: (209) 577-8186 <br /> Fag: (209)577-8158 <br /> McDowell & Davis Towing <br /> 1360 Escalon Avenue, Escalon, California <br /> Quarterly Groundwater Sampling Report <br /> March 2001 <br /> NARRATIVE <br /> On March 5, 2001 M.7. 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, and groundwater on three groundwater-monitoring wells located at this site and <br /> laboratory analysis of water samples collected from the wells. Spencer Land Surveying, <br /> licensed surveyors, resurveyed the well casing elevations to the City of Escalon <br /> Benchmark No. 2 — Elevation 115.43. The report by Spencer Land Surveying is <br /> presented in Appendix B. <br /> Depths to groundwater measurements were obtained from the three groundwater- <br /> monitoring wells and the wells monitored for floating product before purging. Each well <br /> was evacuated of at least three well volumes by means of a steam-cleaned, stainless steel <br /> bladder-type pump. During the purging of the wells, field pH, electrical conductivity, and <br /> temperature measurements were monitored to verify well stability and to insure that <br /> representative groundwater samples were collected. Once well stability was achieved, <br /> groundwater samples were collected. Field data sheets are presented in appendix C. <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 EDB <br /> and 1,2 DCA (EPA Method 8260B) and gasoline range petroleum hydrocarbons (EPA <br /> Method 5030, GCFID). All of the water samples were checked in the laboratory for <br /> dissolved oxygen concentrations by Method SM4500-0 G. <br />