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B. Field Quality Control Samples <br /> To detect the occurrence of cross-contamination during sampling and to reduce the probability of <br /> false-positive results, a trip blank prepared by the laboratory will be taken to the field and included <br /> in each shipment of samples sent to the laboratory for chemical analyses. <br /> C. Chain-Of-Custody Program <br /> All samples collected for this project will be transported under strict chain-of-custody protocols. <br /> The chain-of-custody program allows for the tracing of possession and handling of individual <br /> samples from the time of field collection through laboratory analysis. The document includes the <br /> signature of the collector, date and time of collection, sample number,number and type of sample <br /> containers including preservatives,parameters requested for analysis, signatures of persons and <br /> inclusive dates involved in the chain of possession. Upon delivery to the laboratory the document <br /> will also include the name of person receiving the samples, and date and time samples were <br /> received. A sample copy of a chain-of-custody form is included in Appendix A. <br /> D. Decontamination Procedures and Waste Disposal <br /> During field sampling all down-hole tools will be thoroughly cleaned prior to sampling. All <br /> sampling equipment will be thoroughly cleaned in an Alconox (or other phosphate-free detergent) <br /> solution and rinsed with potable water and then by DI water prior to use. Disposable sampling <br /> devices will be employed where applicable to reduce the frequency of re-using the same equipment. <br /> Rinsate water from decontamination will be contained in 55-gallon drums and stored temporarily <br /> on-site. Only those drums that meet Department of Transportation (DOT) specifications will be <br /> used. Proper disposal methods for these drummed materials will be determined based on analytical <br /> findings. <br /> V. ANALYTICAL METHODS <br /> All samples selected for chemical analyses will be analyzed by a California Department of Health <br /> Services (DHS)certified independent analytical laboratory. Chromalab of Pleasanton, California <br /> will provide the analytical services. However, other qualified laboratories may be utilized dependent <br /> on work load and time frame considerations. <br /> The samples will be analyzed based on location and suspected contaminants. The specific <br /> contaminant and analyses for each sample is per the following schedule: <br /> 6 <br />