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San Joaquin County Public Health Services <br /> Environmental Health Division <br /> November 1, 1994 <br /> Page 9 <br /> decontamination, thereby minimizing the potential for cross contamination Samples will be drawn <br /> and collected in a manner such that agitation and exposure of the sample to the atmosphere is <br /> minimized Sample containers will be filled by using an attachment which allows flow out the <br /> bottom of the bailer by lifting up on the check valve <br /> Sample Preservation and Handling <br /> Sample containers and handling procedures will be in conformance with the established <br /> protocols for each specific parameter All samples will be placed on ice and kept in coolers until <br /> delivered to the laboratory for analysis <br /> Field Analysis <br /> The pH, specific conductivity, and temperature of the groundwater will be measured in the <br /> field during purging of the wells at the time of sample collection The meters used for measuring <br /> these parameters will be calibrated on a daily basis according to the instructions provided with the <br /> instrument All field measurements will be recorded on a field record of water sample for each well <br /> and will be maintained in the files <br /> Quality Control Samples <br /> One blind duplicate will be collected and one trip blank will be included with the sample <br /> shipment Trip blanks are samples of organic-free water supplied by the laboratory which are <br /> prepared in 40ml glass vials at the same time and location as the preparation of the bottles which are <br /> used for sampling Trip blanks remain with the sample bottles while in transit to the sampling <br /> locations during sampling, and during the return trip to the laboratory Trip blanks are not opened <br /> at any time during these procedures Upon return to the laboratory, the trip blank will be analyzed <br /> for BTEX constituents by EPA Method 8020A, and for TPH/D by EPA Method 8015 <br /> SAC128 18 Page-9 DAMES & MOORE <br />