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' Union Ice Company 1320 West Weber Avenue,Stockton, California July 12, 1994 Phase IVRemedaation Report of Findings Page• 3 Rio Vista, California, (Contractors' License No 279646) pumped and hauled 17,600 gallons of water on March 31, 1993, and 4,600 gallons on April 1, 1993 for a total of 22,200 gallons The water was shipped to and accepted by Refinery Service, Patterson, California (Appendix ' F) 3.1 Soil Sampling All soil sampling equipment was thoroughly cleaned with TSP (trisodium phosphate) before and between sampling to prevent cross contamination Soil samples m the excavation were taken with brass tubes, driven into the sidewalls and the bottom of the excavation The number of samples was determined by the size of the excavation The soil samples did not have head space and were immediately sealed in their liners using aluminum foil-lined plastic caps Soil samples collected for analysis were analyzed using EPA method 8020 for BTX&E I (benzene, toluene, xylenes, and ethyl benzene) compounds, and EPA method 5030/Modified 8015 for total petroleum hydrocarbons-gasoline The muumum detection limits used for each analyte were 5 0 ug/kg for BTX&E, and 2 5 mg/kg for gasoline analyses were conducted by Mobile Chem Labs, Inc , which was on-site and provided a turn-around time of approximately 45 minutes for each sample Mobile Chem Labs is a State-certified laboratory located in Martinez, California Soil samples of the bioremediated soils were analyzed using EPA method 8020 for BTX&E (benzene, toluene, xylenes, and ethyl benzene) compounds, and EPA method 5030 Modified 8015 for total petroleum hydrocarbons-gasoline, and EPA method 3550/Modified 8015 for total petroleum hydrocarbons - diesel The minimum detection limits used for each analyte were 5 0 ug/kg for BTX&E, and 1 0 mg/kg for gasoline, and 5 0 mg/kg for diesel Analyses were conducted by GeoMonitor, Inc, a State certified laboratory in Hespena, California 3.2 Groundwater Sampling A travel blank provided by the laboratory accompanied the sample vials from the time they were picked up from the lab to the time they were delivered to the lab This travel blank was listed on the Chain of Custody but was analyzed only if the corresponding samples were found to contain contaminants Groundwater samples were taken from the floor of the excavation using disposable Teflon bailers De-ionized or organic-free water, also provided by the laboratory, was introduced into the bailer as a final stage of cleaning This water was then gently poured into sample vials to be used as bailer blanks These bailer blanks were not tested unless their corresponding samples contained contaminants I