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April 20, 1995 <br /> Project 113-2(-04,Work Plan,Page 8 <br /> TASK 3 -WELL DEVELOPMENT, PERFORMANCE AND AQUIFER EVALUATION <br /> 'PEST <br /> About 48 hours after well installation, MW-5, MW-6 and MW-7 will be developed by <br /> the removal of groundwater and residual sediment or drilling residues. <br /> Development is accomplished by pumping and bailing. <br /> A well performance and aquifer evaluation test will be done by pumping water from <br /> a 6" diameter well (MW-6) and monitoring the response in the other wells <br /> Information from the test will be used to determine design parameters for future <br /> remediation efforts Procedures for the test are described in the Appendix, <br /> TASK 4_MONITORING WELL PURGING AND SAMPLING <br /> Prior to groundwater purging and sampling, water level measurement data will be <br /> collected from the six groundwater monitoring wells. The monitoring wells will be <br /> purged by evacuating a minimum of three well-casing volumes of groundwater and <br /> will be sampled after allowing the discharge water temperature, specific conductivity, <br /> and pH to stabilize. The Parker Environmental standard operating procedures for <br /> groundwater purging and sampling are included in Appendix B. <br /> The monitoring wells will be sampled with a teflon bailer. The samples will be sent <br /> under chain-of-custody to the state-certified laboratory. The purged water will be <br /> stored on-site in 55-gallon DOT drums pending laboratory analysis for appropriate <br /> disposal. <br /> TASK 5 -LABORATORY ANALYSIS <br /> Soil and groundwater samples will be sent to a state-certified hazardous materials <br /> testing laboratory All soil samples selected from the boring and groundwater samples <br /> from the monitor wells will be analyzed for TPH g by modified EPA Method <br /> 8015/5030 and for BTEX by EPA Method 8020/602. <br /> TASK 6 - SURVEY WELLS, ANALYZE DATA <br /> The tops of the well casings will be surveyed by a State Licensed Land Surveyor to the <br /> nearest 0.01 foot. Groundwater elevations will be derived which will facilitate a <br /> groundwater gradient and flow direction determination. <br /> After the soil and groundwater laboratory data is available, the vertical and lateral <br /> extent of subsurface soil contamination and lateral extent of groundwater <br /> contamination will be evaluated Based on this data, site remediation alternatives <br /> will be discussed and a remediation work plan can be developed <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (415) 439-1024 Fax (415) 439-2566 <br />