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i Site Investigation- U.S. Naval Communications Station CIWMB Site No. - 39-AA-0006 Page 5 of 6 Investigation Document may help in the identification of the need to implement gas control requirements during the periods of closure and postclosure maintenance . Rubble Pile Rubble piles less than 6' in height, consisting of concrete and asphalt, were observed to skirt both sides of a circular road on about 1 acre of land approximately 200 yards due west of building 818 . Vegetation growing around and among rubble piles indicates that these piles have probably been in place for several years . This area is separate from the old landfill site discussed above and no disposal trenches were reported to underlie the rubble piles. No apparent environmental threats were identified with the stockpiled inert materials . Burn Pit A less than one acre area was formerly used for Communications Station personnel to practice fire fighting techniques . This area is located about 4 mile south of building 619 and is not associated with the old landfill site or rubble piles discussed above . Site personnel reported that various items were ignited in the pit using various solvents and propellants . The pit, approximately 301x50' is currently covered with a plastic liner weighted down with sand bags to prevent the further infiltration of water. Water that collects over the liner is pumped and stored in an adjacent portable holding tank. A groundwater monitoring well is located about 15' from the pits northern edge and piezometer #156 is located about 15, from the pits eastern edge . The sanitary seal at the top of piezometer #156 was noted to be loose and above the adjacent ground surface. As solvents and other types of propellants had been added to the items burned, the burn pit may contain hazardous wastes . If this is found to be so, then the CIWMB and LEA may not have regulatory authority over .the former burn pit or for any subsequent closure requirements . DTSC may have the lead role in this area. .Nevertheless, CIWMB staff recommendations regarding the closure of the burn pit are the same as those ARARs offered above for the closure of the old landfill site (minus gas control recommendations) . CIWMB staff may have further recommendations regarding the closure of the burn pit based on information contained in the forthcoming Site Investigation Document . If Robert Anderson or I can be of further assistance regarding the multi-agency investigation of this site, please call Mr. Anderson at 916-255-2482 or me at 916-255-2471 . Mr. Ed Padilla,