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t N STALE of CALIFORNIA • GEORGE DEUKMEJIAN,Governor CALIFORNIA REGIONAL WATER QUALITY CONTROLBOARD— CENTRAL *, VALLEY REGION -� 3443 ROUTIER ROAD SACRAMENTO,CA 95827.3098 19 June 1987 Mr. Robert 0. Godwin, Associate Director NVI&O 1 ' University of California PPR 1rvTq Lawrence Livermore National Laboratory qtr P. 0. Box 808 Livermore., CA 94550 URYELL STATUS REPORT, LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300, SAN JOAQUIN COUNTY . We have reviewed your 14 April 1987 letter regarding the status of drywells at Lawrence Livermore National Laboratory (LLL) Site 300 along with other drywell information submitted previously. The enclosed memorandum contains Our comments and conclusions on the 18 drywell sites, two of which are discharges to ground rather than to drywells. - The discharge to ground at Building 819 of pesticide rinse water and high explosives (HE) equipment washdown water constitutes an illegal discharge and must cease immediately. Soil sample results given in your April letter indicate that a threat to water quality exists due to high levels of some metals. No pesticide data were given. By 17 July 1987, you are required to submit a work plan and time schedule for an investigation to determine the extent of soil and ground water contamination at this site. Please include in this submittal any ground water monitoring results from the nearby well , boring logs for the well and soil borings, all data for the last six months from samples taken from the retention tanks, and the volume of water discharged in the last six months. The second discharge to land discussed in the enclosed memo is from vehicle washings in an automotive shop at Building 879. While this water is now collected in a retention tank and transported to LLNL's main site, the soil in the area of the previous discharge needs to be sampled to determine the extent of- organic contamination (1,000 ppb of toluene and 6 ppm of methylethyl ketone were found in samples taken from the discharge ditch in 1983). Soil samples also should be analyzed for oil and grease and metals. By 17 July 1987, please submit a plan and time schedule for this work. Of the 16 drywells discussed in the enclosed memo, 11 require additional information and/or sampling as follows: 1. General Services Area (GSA) Drywells 875-S2, 873-E, and 872-S could pose a threat to water quality based on wastewater characteristics submitted in February 1983. We need well construction details and soil samples directly from the bottom of these wells to determine if additional cleanup is needed.