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P.O. Box 576981-6981 <br /> M.J. Kloberdanz & Associates Modesto, California 95357 <br /> Environmental Assessment Phone: (209) 577-8186 <br /> Fax: (209) 577-8158 <br /> McDowell & Davis Towing <br /> 1360 Escalon Avenue, Escalon, California <br /> Quarterly Groundwater Sampling Repo r <br /> June 2001 <br /> ENVr'.YQr <br /> 2441 <br /> NARRATIVE PEAMITIS Q'&CEEgLry <br /> S <br /> On June 27, 2001 M.J. K.loberdanz & 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 /> �..r purging, groundwater sample collection and laboratory analysis of water samples collected <br /> 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 were <br /> monitored to verify well stability and to insure that representative groundwater samples <br /> were collected. Once well stability was achieved, groundwater samples were collected. <br /> Field data sheets are presented in appendix B. <br /> s <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 826013) 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 />