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. percent bentonite powder by volume will be used to fill the annular space <br /> between the bentonite layer and the surface to prevent surface water <br /> from infiltrating into the well and to prevent conduits for the migration of <br /> contamination from shallow groundwater into deeper zones The cement <br /> seal in these shallow wells will be placed by simply pouring the seal into <br /> the boring without using a tremae pipe The well heads will be protected <br /> with a locking well plug beneath an at-grade, traffic-rated well box (See <br /> Figure 5 - Typical Monitoring Well) <br /> TASK 6 - ANALYZE THE SOIL SAMPLES <br /> One (1) capillary zone soil sample from each boring described in task 5 <br /> will be analyzed at a CAIS-EPA certified analytical laboratory for TPH-G, <br /> BTEX, oxygenates, alcohols and HVOCs by EPA Method 8260 and TPH-D by <br /> modified EPA Method 3550/8015 <br /> TASK 7 - DEVELOP THE MONITORING WELLS <br /> ASE will develop each monitoring well using multiple episodes of surge <br /> block agitation and evacuation with pumps and/or bailers At least ten <br /> (10) well casing volumes of groundwater will be removed during <br /> development, and evacuation will continue until the water is reasonably <br /> clear <br /> The monitoring wells installed deeper than 19-feet bgs will be developed <br /> prior to placing the cement sanitary seal The shallow monitoring wells <br /> will be developed after waiting at least 72 hours after placing the cement <br /> sanitary seal <br /> Purged groundwater will be stored on-site in sealed and labeled 55-gallon <br /> steel drums until off-site disposal can be arranged <br /> TASK 8 - SAMPLE THE MONITORING WELLS <br /> ASE will collect groundwater samples from the monitoring wells after <br /> waiting at least 72 hours following their construction and development <br /> Prior to purging and sampling, ASE will measure the depth to groundwater <br /> and check for the presence of free-floating hydrocarbons in all site wells <br /> prior to purging water from any well Prior to sampling, each well will be <br /> purged of at least four well casing volumes of groundwater using pumps <br /> and/or bailers The temperature, pH and electrical conductivity of <br /> • evacuated water will be monitored during the well purging Purging will <br /> continue beyond four well casing volumes if these parameters have n o t <br /> Frank's One Stop Workplan -- June 2000 <br /> -15- <br />