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Site Investigation- U.S. Naval Communications Station CIWMB Site No. - 39-AA-0006 Page 3 of 6 43211, current State disposal site closure regulations apply to mixed waste sites. However, pursuant to 22 CCR. 66300 (a) (2) , a waste mixture formed by mixing any waste or substance with a hazardous waste must also be managed as a hazardous waste. Title 22 CCR 66130 states : "management" or. "hazardous waste management_" means the systematic control of the collection, source separation, storage, transportation, processing, treatment, recovery and disposal of hazardous waste . In light of the above, it appears that the CIWMB and LEA have authority for regulating the former disposal area and any subsequent closure requirements for the disposal area at the Communications Station in conjunction with DTSC requirements. Since it appears that the hazardous waste cannot be segregated from non-hazardous waste and that hazardous waste exists throughout the site, the entire disposal site may be required to close under regulations governing hazardous waste facilities (Title 22 , RCRA Subtitle C, or CERCLA) which are implemented by DTSC. Closure requirements for hazardous waste facilities are more stringent than requirements for disposal sites . Therefore, DTSC may be the more appropriate lead agency for closure of the Communications Station disposal site. Although DTSC may be the lead agency for the old landfill site closure, applicable or relevant and appropriate requirements (AR.ARs) of the CIWMB should be addressed. To help staff of DTSC and the Regional Water Quality Control Board (RWQCB) in the development of closure requirements for the former disposal area, CIWMB staff recommend the following sections of 14 CCR for consideration in establishing any closure activity for the -50-60 affected acres : 17637 Subsurface Records- Specific information regarding the length and depth of any cuts made in natural terrain where fill was placed along with the depth to the groundwater table should be ascertained. This. information should be included in the forthcoming Site Investigation Document . 17688 Volume Reduction and Energy Recovery- The stockpiling and subsequent chipping of landscaping and wood waste on the old disposal site should not interfere with the proper construction and maintenance of intermediate or final cover. To preserve the integrity of the cover, this activity should not occur over any fill surface and any deterioration of cover resulting from associated traffic must be immediately corrected.