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CENTRAL VOEYREGIONAL-WATER-QUALITY-iCOOR:BOARD-------------------.-- INSPECTION REPORTJ 2 February 1987 DISCHARGER: LAWRENCE LIVERMORE NATIONAL LABORATORY (LLNL) SITE 300 LOCATION & COUNTY: Corral Hollow Road, San Joaquin County CONTACT(S): INSPECTION DATE: Judy Steenhoven 17 December 1986 INSPECTED BY: Cam Williams, Wendy Cohen ACCOMPANIED BY: Judy Steenhoven (Environmental Analyst), Connie DeGrange (Section Leader of Guidance and Monitoring Section), Don Gonzales (Photographer) . OBSERVATION AND COMMENTS: This inspection report was conducted in accordance with Section 25208.7(a) of the Toxic Pits Cleanup Act (TPCA) and was to determine the applicability of the TPCA to Waste Management Units at Site 300. During the pre -inspection meeting I discussed the four major criteria by which a Waste Management Unit is determined to be subject to the TPCA. From the prelim- inary review of the files, I had determined that twelve Waste Management Units had been identified and explained why each Waste Management Unit may be regulated by the TPCA. I informed LLNL personnel that if a Waste Management Unit(s) is deter- mined to be regulated by the TPCA that the surface impoundment will have to close by 30 June 1988 and that a hydrogeologic assessment report (HAR) is required under Section 25208.7(b) and 25208.8. The following Waste Management Units were identi- fied as potentially being regulated by the TPCA: Lagoons 806/807, 807A, 8078, 825, 826, 827C/D, 827E, and 828; the two Class II surface impoundments (817 area); the 806/807 concrete surge tank and the burn pit. During the inspection, each of the Waste Management Units were observed, except for Lagoon 828. The lagoons did not contain liquid wastes as they are no longer in use. Wastes are currently piped to the 817 Class II surface impoundments. Drilling activities have altered the appearance and shape of most of the lagoons. Only Lagoon 827E had not been sampled, due to inaccessability to the drilling rig. The 806/807 concrete surge tank was observed to be a free standing structure on three sides with the fourth (back) side built into a hillside. The piping to and from the surge tank was above ground. The surge tank is approximately 15 by 20 feet and stands about 10 feet high. The two Class II surface impoundments were observed to be in good condition and well maintained. On this day only a trickle of wastewater was entering the larger surface impoundment and the water level was less than one foot deep. IREVIEWED BY:1