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P.O. Box 576981 M.J. Kioberdanz & Associates Modesto, California 95357-6981 Environmental Services Phone: (209) 577-8186 Fax: (209) 577-8158 k Pombo Ranch Property <o os 24100 S. Lammers Road, Tracy, California �'GcFgl� Quarterly Groundwater Sampling Report Third Quarter July 2005 rb� NARRATIVE '° On July 20, 2005 M.J. Kioberdanz & Associates, in conjunction with GeoAnalytical Laboratories, Inc., conducted quarterly groundwater monitoring of the Pomba Ranch site at 24100 S. Lammers Road in Tracy, 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 six 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, held 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, GCFfD). Dissolved Oxygen.was measured in the field with a down hole probe after purging with a submersible pump and before sampling. C�;