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A <br /> Revised Work Plan For Soil and Groundwater Assessment I1 <br /> Ranch Market,23569 South Santa Fe Road Riverbank California April 25,2000 <br /> Groundwater Monitoring and Sampling <br /> Groundwater Monitoring Wells <br /> Following installation, the five new wells and four existing wells will be monitored and <br /> sampled. All equipment used to monitor the depth to groundwater and to purge the well will be <br /> decontaminated before entering the well. Prior to collecting a water Sample, the depth to <br /> groundwater and the depth to the bottom of each well will be gauged using an electronic water <br /> level meter. Based on the measurements of water level and well depth, three to four well casing <br /> volumes will be removed using a down hole submersible pump or bailer. Measurements of <br /> temperature,pH, and conductivity will be taken periodically to assure that representative <br /> groundwater is present in the well prior to sampling. All purge water will be placed in DOT <br /> 55-gallon drums on Site for temporary storage pending disposal. Water samples will be <br /> collected using a disposable bailer and decanted into six 40-m1 VOA vials. Each VOA vial <br /> will be filled and checked to insure that no air bubbles are present. <br /> Domestic Water Wells <br /> The four domestic water wells will be also be sampled in conjunction with the groundwater <br /> monitoring wells. Water samples will be collected from each domestic well between the pump <br /> and holding tank or immediately downstream of the holding tank. Water samples will be <br /> collected in six 40-m1 VOA vials. Each VOA vial will be filled and checked to insure that no <br /> air bubbles are present. <br /> Per the RWQCB request, monthly water samples will be collected from domestic well DM-I <br /> starting on April 28, 2000. The results of the monthly sampling will be incorporated into the <br /> quarterly groundwater monitoring and sampling report. In the event any chemicals of concern <br /> are reported in the monthly water samples collected from DM-1, the laboratory data will be <br /> faxed to the RWQCB and the property owner will be called. <br /> Water Sample Analyses <br /> The water samples will be labeled with the well number, placed in an insulated container on <br /> ice, and transported under standard chain-of-custody procedures to Kiff Analytical located in <br /> Davis, California. The water samples were analyzed for BTEX; TPHg; Oxygenates including, <br /> MtBE, TBA, DIPE, ETBE, and TAME; and fuel additives 1,2-DCA and EDB using EPA <br /> method 8260 B. <br /> Fe:aaAeoPMt WeHWIM P <br />