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KL E/NFEL DErR <br /> Blight People.Bight Solutions. <br /> be placed above groundwater. Prior borings at the site under these <br /> conditions have remained open for bentonite seal placement from the <br /> surface and is acceptable according to county guidelines and <br /> inspectors. Placement of chips/pellets also is not practical using a <br /> tremmie pipe given the small diameter of the probes (3-inches). If soil <br /> conditions are found to have evidence of caving at these depths, a <br /> bentonite slurry (using bentonite powder) will be mixed and installed <br /> using a tremmie pipe. <br /> c) How the wells will be grouted when the casing is removed from the <br /> well (the neat cement described must be placed using a tremmie pipe or <br /> acceptable alternative). Because these wells will be located in a future <br /> land application area, the ground installation is considered especially <br /> important. After the last sampling event, the well casings will be. <br /> removed. The well borings will then be backfilled with a neat cement <br /> grout using a tremmie pipe placed near the bottom of the boring. The <br /> tremmie pipe will be slowly removed as the grout fills the boring from <br /> bottom to surface grade. The work will be conducted in accordance with <br /> San Joaquin County well destruction standards. <br /> 3. You may test the groundwater samples for the presence of coliform organisms, <br /> but based on the well construction technique and lack of development, the <br /> samples have a high probability of positive results. Testing for coliform <br /> organisms in this groundwater investigation is not critical, although pending <br /> authorization to use the land application area, coliform testing will be required <br /> when permanent wells are installed in the land application area. The OLWD <br /> concurs with this observation and therefore will not test for coliform organisms <br /> at this time. <br /> 4. A report describing the installation and destruction of the wells shall be <br /> submitted to the Central Valley Regional Water Quality Control Board within <br /> 90-days of the completion of field activities. . The OLWD will have a well <br /> installation and destruction report prepared within the noted timeframe. In <br /> addition, the OLWD will inform RD 17 that this information will be available <br /> upon their request. <br /> Kleinfelder's initial work plan assumptions, conditions, and limitations apply to this <br /> addendum. <br /> 48093.E01/ST010R161 Page 2 of 2 April 19, 2010 <br /> Copyright 2010 Kleinfelder <br />