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JAT`OF CALIFORNIA -� GEORGE DEUKMEJIAN.Governor <br /> CALIFORNIA REGIONAL WAi En QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD g <br /> � - <br /> SACRAMENTO,CA 95827-3098 <br /> 9 March 1988 <br /> Mr. Wilbur H. Smith <br /> Lincoln Properties Limited <br /> 628 Lincoln Center <br /> Stockton, CA 95207' <br /> REVISED BORING TECHNIQUE FOR GROUND WATER INVESTIGATION, LINCOLN <br /> VILLAGE CENTER, STOCKTON, SAN JOAQUIN COUNTY <br /> The revised proposal for boring and geological sampling described <br /> in the 1 March 1988 letter from Leedshill-Herkenhoff, Inc. , is an <br /> improvement over the original proposal to log cuttings obtained <br /> while boring with a mud rotary drilling rig. However, all <br /> borings should be logged throughout the entire length of the <br /> monitoring well, not just in the vadose zone as indicated by your <br /> letter. <br /> Since the subsurface investigation at this site has not been <br /> initiated, we lack sufficient information to determine whether <br /> additional borings to characterize the geology at the site will <br /> be required. Therefore, we cannot rule out the need for further <br /> geological characterization at this site. This phase of the <br /> investigation should proceed immediately so that the ground water <br /> gradient can be determined, an initial assessment of ground water <br /> quality can be made, and potential source areas can be evaluated. <br /> We request you notify us at least one week before any on-site <br /> subsurface work is started so that we have the opportunity to <br /> observe procedures and split samples of soil and ground water. <br /> As stated in our 23 February 1988 letter, the Technical Report <br /> including results from this investigation, and recommendations <br /> for further work is still due to the Regional Board by 24 June <br /> 1988. <br /> If you have any further questions, please contact me at (916) <br /> 861-5681. <br /> ROBERT L. NIBLACK <br /> Engineering Geologist �G llj <br /> RLN MAR 7 1988 <br /> cc: see attached list ENVIROMENTAL HEALTH <br /> PERMIT/SERVICES <br />