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LEEDSNILL•NERKENNOFF, INC. <br /> Quality Assurance -. Quality Control (QA-QC) <br /> QA-QC is a detailed program undertaken by the laboratory to ensure the <br /> highest degree of accuracy and reproducibility of the analytical results. <br /> The Lincoln Village Center sample collection plan will include a program of <br /> 10 percent duplicate and spiked samples, trip blank and field blank. <br /> TIME SCHEDULE <br /> It is estimated that completion of the Phase I work plan will require ap- <br /> proximately three months following approval of the plan by the RWQCB. <br /> CONCEPTUAL REMEDIATION PLAN <br /> A report will be prepared setting forth the results of the Phase I ground- <br /> water investigation. The report will include documentation of site history, <br /> evaluation of existing data, results of water analyses, methodologies used, <br /> and conclusions of the investigation. If necessary and appropriate, the <br /> report will also present a conceptual remediation plan, based on the conclu- <br /> sions of the Phase I study. If it is found that additional data are re- <br /> quired, it may be necessary to conduct a Phase II investigation prior to <br /> finalization of the conceptual remediation plan. If found to be necessary, <br /> the conceptual remediation plan will include a time schedule for site clean- <br /> up. <br /> PHASE II - GROUNDWATER INVESTIGATION <br /> At the present time, the nature and extent of Phase II work cannot be deter- <br /> mined. It is possible that the Phase I groundwater study will be sufficient <br /> to accurately delineate the extent of contamination and to define the method <br /> of site cleanup. If a Phase II investigation is required, it might include <br /> any or all of the following: <br /> 1. further investigation into source or sources of contamination. <br /> This could include conducting a soil vapor survey of permeable <br /> trench backfill areas surrounding sanitary and storm drains; <br /> -5- <br />