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k <br /> STATE OF CALIFORNIA <br /> GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD \r7A <br /> SACRAMENTO,CA 95827-3098 <br /> 11 August 1989 <br /> Gi avECr�Jill 1 SES <br /> Mr. James Elder <br /> LBME Corporation <br /> 3814 Auburn Blvd. , Suite 62 <br /> Sacramento, CA 95821 <br /> PROPOSED MONITORING WELLS, TEICHERT LAND COMPANY, STOCKTON, SAN JOAQUIN COUNTY <br /> We received your 22 July 1989 letter on 3 August. We appreciate your response <br /> and you have adequately addressed all of the concerns in our 12 July letter, <br /> except for comment 2, Sampling Data. Comment 2 of our letter asked if ground <br /> water gradient data existed, and was sufficient, to support using existing wells <br /> 4 and 5 as indicators of background levels, and to locate proposed wells 7 and <br /> 8. Your response states that "Water level measurements in monitor wells 3, 4, <br /> and 5 indicate the ground water gradient to be 70°± Northeast. Water level <br /> measurements of monitor wells 3, 5, and 6 indicate the groundwater gradient to <br /> be about 70° Southwest which places wells 7 and 8 downgradient. " <br /> These statements imply that ground water flow on-site is in opposite directions, <br /> thus a hydraulic ridge exists, which would be unlikely at this site. <br /> Additionally, it appears that ground water flow directions are being determined <br /> using selected and/or different combinations of monitoring wells (which may <br /> explain the above mentioned anomaly). To construct accurate ground water <br /> contours, water levels measured during the same time period from all monitoring <br /> wells screening the same zone must be used. Piezometric surfaces are continuous <br /> and cannot be segmented into areas as if they are not related. <br /> In order to resolve this issue, and ensure that the proposed work will be <br /> appropriate, please submit all water level data and contour maps for the site <br /> ge-erated to date for our review. We do not want to unnecessarily delay the <br /> proposed work, but correct placement of the proposed wells is of primary concern. <br /> If you have any questions, please call me at (916) 361-5742. <br /> GARY A. REENTS <br /> Area Engineers <br /> GAR:ej <br /> cc: t,*s. Diane Hinson, San Joaquin Public Health Services, Stockton <br /> Ms. Virginia Cahill , McDonough, Holland & Allen, Sacramento <br /> Mr. Robert Hamel , Teichert Land Company, Sacramento <br />