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2) Provisions for archiving cores are contained in the Department's draft standards dated August 1990. A copy of the provisions pertaining to cores is included as an attachment. The referenced draft standard for archiving cores will be followed. 3) The Department is concerned that a grout mixture of 4.5 gallons per bag of cement may be too thick for pumping. We recommend a seven to ten gallon range. Additional recommendations are contained in an attachment to this memorandum. Seven to ten gallons of water will be mixed per 90-pound sack of type I-II Portland cement. Grout seals will be tremied into place. 3.0 CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD COMMENTS The RWQCB provided seven technical comments in its letter of August 30, 1990 (Attachment 3). These comments are discussed below. 1) Since the sampling of the ground water is very limited and dated (only sampled once in late 1986/87), the MARK Group correctly concludes that this data is insufficient to gauge the quality of the ground water (page 2-4). Yet, they recommend that further sampling be limited to VOCs only. Additional chemical analyses appears appropriate based upon these Kleinfelder findings: a) Landfill area wells having arsenic and selenium levels in excess of MCLs, and specific conductance levels of around 3,000 micromhos/cm, and chloride and sulfate levels as high as 8,000 to 1,500 mg/1 respectively: b) Well W-1 in the Fire Fighting area having arsenic and chloride levels of 300 ppb and 2,170 mg/1 respectively. In addition, petroleum odors and sheens were noticed in ground water samples from this area. Therefore, total petroleum hydrocarbon scans and BTXE analyses should be conducted in this area. c) Well W-3 in the GSA area having an arsenic level of 200 ppb and p,p-DDD at 0.07 ppb. d) Elevated levels of chloride, sulfate, and specific conductance were measured in piezometers and monitoring well W-18 in the Battery Acid Disposal Area. 6