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' • 0 <br /> Mr. F. Wally Sandelin - 2 - March 9, 2015 <br /> depth zone between 75 and 125 feet. The extraction well would be constructed with a screen <br /> interval of 75 to 125 feet. The recommended extraction rate for the proposed extraction well is <br /> 50 gallons per minute. The final depth and screen interval for the well would be based on the <br /> soil types logged during the installation of the well. <br /> Central Valley Water Board staff concurs with the proposed installation and operation of an <br /> extraction well to target the middle portion of the Central Plume. Please notify Central Valley <br /> Water Board staff at least one week prior to conducting the field activities. Please submit a <br /> report of well installation within 60 days of completed the field work. <br /> If you have any questions regarding this letter, please contact me at (916) 464-4665 or <br /> ncasebeer@waterboards.ca.gov. VED <br /> ORIGINAL SIGNED BY <br /> Nathan Casebeer, P.G. MAR 31 2016 <br /> Engineering Geologist W' '��� �RONTAEh <br /> Private Sites Cleanup Unit �� . -9- <br /> u rp s T. 'r:P4RTV7""4 <br /> cc: Philip Smith, Langan Treadwell Rollo, San Francisco <br />