Laserfiche WebLink
STATE OFICAUFOPNIA GEORGE DEUKME,]IAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION "� o <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> NOV 10 1989 <br /> 8 November 1989 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Harry Mossberger <br /> Kearney-KPF <br /> P. 0. Box 8485 <br /> Stockton, CA 95208 <br /> GROUND WATER ASSESSMENT PLAN, KEARNEY-KPF, SAN JOAQUIN COUNTY <br /> Enclosed is our review of the Kearney-KPF Groundwater Assessment Plan submitted <br /> by Hargis and Associates on 29 September 1989. In general , the report is well <br /> prepared and documented and is comprehensive. The data summarizations and <br /> graphics are exemplary. However, we have several concerns with the report and <br /> proposals which are discussed in the staff memorandum. These comments should <br /> be reviewed, and if applicable, incorporated into the next phase of the remedial <br /> investigation (RI). Our major concerns are summarized below and should be <br /> considered prior to implementing any additional work at your facility. <br /> 1. Historical records indicate that the upper aquifer is dewatered below the <br /> screen lengths in the majority of the existing monitor wells. Therefore, <br /> because these wells are dry, they are not adequate for long-term <br /> monitoring. Additionally, short-screen lengths will not provide <br /> representative head data due to their partial penetration of the water <br /> bearing zone. Consequently, additional monitor wells, with appropriate <br /> screen lengths and screened horizons, may need to be installed, even in <br /> areas with existing wells. <br /> 2. The number of monitor wells and soils borings proposed for the next phase <br /> of the RI seems to be more than is necessary at this time. The <br /> installation of fewer monitor wells more strategically located should be <br /> more cost effective and may provide enough information to adequately <br /> contour the ground water contaminant plume. <br /> 3. The proposal to abandon the supply wells is inadequate. The proposal does <br /> not contain details of how the wells will be abandoned and the slurry <br /> design may be inappropriate for the well conditions. Because these wells <br /> may be conduits for contamination of lower water bearing zones, it is <br /> important to demonstrate that the annulus has been adequately sealed. <br /> Therefore, we believe a cement bond log or similar purpose log must be <br /> performed. <br /> To ensure that additional monitor wells will be functional for the long-term, <br /> we require that you submit a technical report detailing monitor well design. <br /> In addition, this report must also contain detailed plans to properly abandon <br />