Laserfiche WebLink
GEORGE DEUKMEJIAN.Governor <br /> STATE OF CALIFORNIA <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD- <br /> CENTRAL VALLEY REGIONRF <br /> ": <br /> 3443 ROUTIER ROAD sk; <br /> SACRAMENTO.CA 95827-3098 a <br /> 21 December 1989 DEC i 7 =43 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Wilbur H. Smith <br /> Lincoln Properties Limited <br /> 374 Lincoln Street <br /> Stockton, California 95207 <br /> LINCOLN VILLAGE CENTER, REVISED PHASE II WORKPLAN, SAN JOAQUIN <br /> Enclosed are our comments on the revised Phase II workplan <br /> submitted to us, by your consultant, on 6 December 1989 . Based <br /> upon the August 1989 water quality data provided by the County, <br /> on their onsite municipal water wells, we have determined that <br /> the revised Phase II workplan is not sufficient. The water <br /> quality data from the county indicates a worsening of the ground <br /> water contamination. The municipal wells are sealed to at least <br /> 80 feet below the ground surface, with initial perforations <br /> around 200 feet. The contamination within these wells indicate <br /> that the known contamination, within the uppermost water bearing <br /> zone, has descended to at least 200 feet. <br /> Based upon this new data, the Phase II workplan must be expanded <br /> to assess the extent of the vertical contamination and to abate <br /> the contamination of the municipal wells. As elaborated upon in <br /> the enclosed staff memorandum the revised workplan must include <br /> the following: <br /> 1) Monthly water level data. <br /> 2) The sampling and analyses of all monitoring wells and <br /> the three LVMD wells for EPA 601 compounds. Laboratory <br /> data sheets must be submitted. <br /> 3) The rational for the placement and screened interval <br /> depths of the seven shallow monitoring wells proposed <br /> in the 6 December 1989 workplan submittal , and for the <br /> cluster wells which we are recommending to determine <br /> the vertical extent of contamination. <br /> 4) The proposed drilling and lithological logging <br /> techniques for the monitoring wells. <br /> 5) An investigation of the cause of the contamination <br /> within the deep aquifer. If it is determined that the <br /> county municipal wells are contributing to the <br /> contamination of the deep aquifer, then remedial <br /> actions must be taken. <br />