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P.O. Box 576981 <br /> MA Kloberdanz & Associates Modesto, California 95357-6981 / <br /> Environmental ServicesnoED <br /> Phone: (209) 577-8186 <br /> s W <br /> Or"EV Fax: (209) 577-8158 <br /> FFD 1 i Z005 <br /> l:P1pE0�TTH <br /> jSE!3V1C�S <br /> Pombo Ranch Property <br /> 24100 S. Lammers Road, Tracy, California <br /> Quarterly Groundwater Sampling Report <br /> First Quarter January 2005 <br /> NARRATIVE <br /> On January 20, 2005 M.J. Kloberdanz & Associates, in conjunction with GeoAnalytical <br /> Laboratories, Inc., conducted quarterly groundwater monitoring of the Pombo Ranch site <br /> at 24100 S. Lammers Road in Tracy, California. Quarterly monitoring activities <br /> consisted of depth to water and water characterization measurements, well purging, <br /> groundwater sample collection and laboratory analysis of water samples collected from <br /> 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, GCF1D). Dissolved Oxygen was measured in the field with a down- <br /> hole probe after purging with a submersible pump and before sampling. <br /> SUMMARY FINDINGS <br /> . Shallow groundwater was measured at depths of 11.61 to 12.42 feet below grade during <br /> the January 20, 2005 groundwater monitoring event. Water levels were approximately <br />