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4 <br /> STATE OF.CALIFORNIA GEORGE DEUKMEJIAN Governor <br /> ALIFORIA REGIONAL WATE UALITY CONTROL BOARD— <br /> CENTRAL <br /> OAR —CENTRAL VALLEY REGION `R <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 31 December 1987 <br /> Mr. Robert 0. Godwin, Associate Director <br /> University of California <br /> Lawyonce. Livermore Notional Laboratory <br /> P. 0. Box 80,21 <br /> Livermore, CA 1)4550 <br /> REPORT OF RECENT INSPECTION, U111VERSITY OF CALIFORNIA, LAWRE110E LIVERNIGRE <br /> NATIONAL LABORATORY SITE 300, SAN JOAQUIN COUNTY <br /> The enclosed inspection report describes the 30 October 1987 meeting and <br /> inspection by Regional Board staff of' La'w'rence 'Livermore National Laboratory <br /> (LLNL) Site 300. <br /> At the meeting we discussed the draft Environmental Restoration Mork Plan which <br /> was provided that day. We discussed some portions of the work plan at that <br /> time, and I subsequently provided detailed comments to Albert Lamarre of your <br /> staff by telephone on 4 November 1987. The final work plan, which was submitted <br /> 4 December 1987, is acceptable with one change which is discussed below. The <br /> work plan and time schedules should be updated in each Environmental Investi- <br /> gations Quarterly Report; please show the new and old versions for easy com- <br /> parison. <br /> One change needed in the work plan is in Task 12 concerning Pit 6. According to <br /> Mr. Lamarre, LLNL implemented the recommendations in Brown and Caldwell 's (B&C) <br /> July 1987 report by installing two new wells in the shallow alluvium near <br /> existing Wells EP 6-9 and K 6-1. Our geologist has reviewed that report, and <br /> while we generally concur with B&C's conclusions and recommendations, we feel <br /> the ground water flow directions are not clear on the pit's west side. Ac- <br /> cording to our geologist, if the ground water follows the topography (the pit <br /> lies on a ridge) , the flow could be southwest as well as southeast. To check <br /> this possibility, a piezometer should be installed on the west side of the pit <br /> south of the fault, and the piezometric water levels reevaluated. <br /> Also, TCE has been found at high levels in two samples from Well BC-13 (100 ppb <br /> and 70 ppb; state action level for TCE is 5 ppb) . This is a shallow well <br /> `� monitoring a spring which discharges to the ground surface at a road cut. The <br />