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Ms.Devra Lewis <br /> June 7,2001 <br /> Page 8 <br /> Following well development and stabilization of the measured parameters, each monitoring well will be <br /> allowed to recover to 80%of the initial volume of water prior to sampling. Groundwater samples will be <br /> collected by lowering a dedicated disposable PVC bailer with dedicated nylon bailer line into the well. <br /> Groundwater samples from each well will be transferred directly from the bailer into the appropriate <br /> sample containers provided by the laboratory. For VOC analyses, care will be taken when transferring the <br /> water from the bailer to the containers to avoid turbulence as much as possible and assuring that no air <br /> bubbles are trapped within the sample vials. Sample containers will be labeled to indicate project number, <br /> well number, time and date collected and placed in a cooler containing ice. Groundwater samples will be <br /> transported to a California-state certified analytical laboratory following the chain-of-custody protocol <br /> described in Section 3.4.2.3. <br /> 3.4.2 QUALITY CONTROL PROCEDURES <br /> In order to ensure that representative data that can be used to meet the objectives of the project are <br /> obtained, strict Quality Assurance and Quality Control(QA/QC)procedures will be followed. The <br /> following sections described the specific QA/QC procedures that will be adhered to during implementation <br /> of this project. The key components of the QA/QC program include quality assurance sample collection <br /> and analysis procedures, laboratory QA/QC procedures, and sample custody control procedures. All field <br /> and laboratory procedures will be performed by trained,qualified personnel. <br /> 3.4.2.1 Quality Assurance Sample Collection and Analysis <br /> Quality assurance samples will be used to evaluate the quality of the data obtained from the field <br /> program. Two distinct types of quality assurance samples will be used during this project. <br /> • Blind duplicate samples for groundwater will be submitted at a minimum rate of one per <br /> ten primary samples obtained. Blind duplicate samples will be analyzed for the same <br /> analytical parameters as the primary samples. The blind duplicate samples provide an <br /> indication of the precision of the analytical methodology as well sampling methodology <br /> and sample matrix variability. <br /> • Trip blank samples for groundwater will be submitted at a minimum rate of one per <br /> shipping container(cooler). Trip blanks consist of analyte free water placed in an <br /> appropriate container. Trip blanks will be prepared by the analytical laboratory and <br /> accompany the primary samples during sampling and transport to the laboratory. Trip <br /> blanks will be analyzed for the same analytical parameters as the primary samples. Trip <br /> blanks provide a measure of positive interferences introduced by sample preservation, <br /> transportation,and storage and analysis. <br /> 3.4.2.2 Laboratory QA/QC Procedures <br /> Soil and groundwater samples will be submitted to Curtis and Tompkins Analytical Laboratory of <br /> Berkeley,California,a California-certified analytical laboratory for analysis. Established QA/QC <br /> procedures for analytical operation include sample custody procedures, standards of analytical <br /> precision and accuracy, analysis of control samples(spikes,blanks, and duplicates),data <br /> reduction, verification of raw analytical data, and maintenance of control charts to monitor <br /> analytical performance. These QA/QC procedures are outlined in a laboratory QA/QC Plan, <br /> which is available upon request. <br /> H:Pioneer-Tracy\WorkP1an200Rworkplan.doc SECOR International Inc. <br />