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B R O W N A No , <br /> CALDWEELLaD <br /> December 4, 1996 1 /i �,{ 11 <br /> B <br /> Ms. Polly Lowry <br /> Associate Engineering Geologist <br /> California Regional Water Quality <br /> Control Board - Central Valley Region <br /> 3443 Routier Road, Suite A 11-2092-13 <br /> Sacramento, California 95827-3098 <br /> Subject: Work Plan for Installation of Additional Groundwater Monitoring Wells <br /> Dear Ms. Lowry: 1 <br /> s please to submit, for your review and approval, this work plan for the <br /> Brown and Caldwell iI <br /> installation of additional groundwater monitoring wells in the vicinity of Georgia-Pacific <br /> Corporation's (GP's) former chemical packaging plant, located at 75 W. Valpico Road in <br /> Tracy California (Site). This work plan is being submitted in response to your letter to <br /> Ms. Julie Raming of GP dated October 4, 1996, and our telephone conversation dated <br /> November 20, 1996. <br /> install four additional groundwater monitoring wells at <br /> GP and Brown and Caldwell propose to <br /> the approximate locations identified on the attached figure. The actual location of the off-site, <br /> g and well <br /> approval- <br /> down well is subject to City and land procedures tobefollowed during this rinvestigation <br /> construction, development, and sampling p <br /> are included as Attachment A. Briefly, borings will be drilled using a hollow stem auger <br /> drilling rig to approximately 15 feet below the encountered groundwater surface. One on- <br /> sEte <br /> i <br /> boring will be continuously cored for lithologic determination and to aid in the future analysis <br /> of potential remedial options. For the remaining three soil boring, one soil sample will be <br /> collected every five feet for logging purposes. Soil samples will be screened for the presence <br /> of volatile organic compound vapors using a photo-ionization detector. In addition, one soil <br /> sample collected from the capillary fringe of each boring will be submitted to an analytical <br /> laboratory for chemical analysis. <br /> Following completion of the drilling and sampling procedures each soil boring will be <br /> completed as a groundwater monitoring well. Monitoring wells will be constructed with <br /> approximately 25 feet of slotted casing, 15 feet below the existing groundwater table and 10 <br /> feet above. The proposed screen length will better accommodate the fluctuating groundwater <br /> levels typically encountered in the Tracy area. The well annulus will be sealed with cement- <br /> bentonite grout and allowed to cure for a minimum of 24 hours prior to development. Once <br /> Enmronmenlal Engineenng And ConsulLng•Anan/ncal Services <br /> i <br /> P.O. Bo\ 8045. WAL\LT CREEK, CA 94596-1220 _ <br /> E:\2092\phue2\workplmdoc3480 BL S K I R K ASE\LE. P L E a S A NT HILL. CA 94523-4342 <br /> 15101937-9010 F+x15101937-9026 <br />