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Stockton 99 Speedway <br /> Quality Assurance Project Plan April 12,2007 <br /> 4.0 SAMPLING LOCATIONS AND PROCEDURES <br /> 4.1 Sampling L <br /> p g ovations <br /> Refer to Section 4 of the PEA Workplan for sampling locations. Locations were chosen to satisfy the <br /> DQO for the PEA. As additional locations may be identified based on the results of the PEA testing, the <br /> Workplan may be amended. The sample locations will be staked and surveyed, as needed, to allow re- <br /> sampling and verification of sample test data. <br /> 4.2 Sampling Procedures <br /> Sampling procedures will be used to collect samples as part of the project work as described Section 4 of <br /> the PEA Workplan. Adoption of and adherence to sampling procedures is a qualitative method to <br /> improve data quality. <br /> 4.3 Sampling Duration <br /> The sampling activities are estimated to occur over a one two-week period. Internal supervision and <br /> oversight will be performed. DTSC may also be present during this time period to oversee the work and <br /> collect additional QC samples. <br /> F <br /> f <br /> k QualHy_A�s$ _�jact_lan.Final.c . 4-1 The Source Group,Inc. <br />