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DRAFT <br /> Data Validation <br /> A data validation will be performed for the analytical data generated during field activities. <br /> All laboratory data will be passed through a data quality review. The parameters to be <br /> evaluated in this review include: <br /> • Sample results reported in appropriate concentration units <br /> • Laboratory blank results <br /> • Analysis of matrix spikes and matrix spike duplicate sample <br /> • Recovery of sample surrogate spiked compounds <br /> • Compliance with analytical method holding times <br /> The field activities will be initiated and personnel and equipment mobilized after <br /> completion of the health and safety plan and acquisition of any required permits and <br /> subcontractors involved with this work The County will be advised of the analytical results <br /> when they are available. <br /> Should you have any questions or comments relating to the scope of work, please feel <br /> free to contact me at (415) 227-0822. <br /> Regards, <br /> ZI'J� <br /> ric Terhorst <br /> Dow Environmental Inc. <br /> Project Manager <br /> Privileged and Confidential Prepared at the Request of Counsel <br /> NPB-95-RAS-029 DEI Project No.2569 <br /> 4 <br />