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S.TAIF OF CALIFORYA i GEORGE DEUKMEJIAN,Governor <br /> e. <br /> CALIFRNIA REGIONAL WATER QUALITY CONTROL — <br /> CENTRAL VALLEY REGIONeb <br /> 3443 ROUTIER ROAD ®A, <br /> SACRAMENTO,CA 95827.3098 <br /> A <br /> • VIt�E.��C t' <br /> 15 September 1987 tl / <br /> Mr. Robert 0. Godwin, Associate Director <br /> Universitv of California <br /> Lawrence Livermore National Laboratory <br /> P. 0. Box 808 <br /> Livermore, CA 94550 <br /> SECOND QUARTER GROUND WATER MONITORING REPORT, UNIVERSITY OF CALIFORNIA, LAWRENCE <br /> LIVERMORE NATIONAL LABORATORY SITE 300, SAN JOAQUIN COUNTY. <br /> I have reviewed the second quarter ground water monitoring report submitted 30 <br /> July 1987 for Lawrence Livermore National Laboratory (LLNL) Site 300, including <br /> your responses to my 5 June 1987 comments on the previous two quarterly reports. <br /> Below I have summarized issues related to each of the facilities covered by <br /> these quarterly reports including Pit 1, Pit 7 complex, 817 surface impound- <br /> ment, and Pit 6. <br /> 1. Pit 1 -- The statistical analysis was done correctly in the second quarter <br /> report except that negative signs were dropped from the "t*" statistic <br /> resulting in findings of significant chane between background and <br /> downgradient wells rather than significant increases for TOC, TOX, and EC. <br /> Using the negative signs shows no findings of significant increase for <br /> those parameters, but significant increases were found for pH. I agree, <br /> however, that all the pH values are within the range of normal variability <br /> and should not be considered indications of contamination. Therefore, you <br /> may propose a reduction in frequency and number of parameters tested at <br /> Pit 1, if you wish. Be aware that the indicators of ground water <br /> contamination (TOC, TOX, EC, pH) and the ground water quality parameters <br /> (chloride, iron, manganese, phenol , sodium, and sulfate) must continue to <br /> be monitored at least on a semi-annual and annual basis, respectively, as <br /> required by your Interim Status Document (ISD). You may also delete water <br /> quality analyses from Well K1-6, which cannot be purged properly due to low <br /> yield, but ground water elevations should continue to be measured for <br /> contour mapping. <br /> Regarding metals in ground water, the second quarter report contains an <br /> extensive discussion concluding that metals are a natural occurrence in <br /> Site 300 ground water. We are willing to ccept this argument based on the <br /> evidence provided, but would like to see data summaries over time for all <br /> Pit 1 and 817 surface impoundment wells for arsenic, chromium, lead, and <br /> selenium. All these parameters have been detected at some time in the <br />