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AOC Work Plans Remaining Septic Tanks No documented investigations have been performed for the septic tanks eE st of the Cover Plant, south of the former Nurse's Station, or west of the former Maintenance Bi ilding. Data Gaps On the basis of the previous sampling events,previous review of regulatol y files by others,and prior discussions with AMMC personnel,it is our opinion that there are no data gaps for the septic tanks. Sampling data collected to date,has indicated that all soil sampler sults were below cleanup levels. Although selected groundwater total metals results excee ed PRGs,it is our opinion,that because the samples were not filtered prior to analysis,they a not considered representative of dissolved metals concentrations in groundwater. Result of the dissolved metals analysis at boring PB-7 located in the Millwork Building Septic leach field did not detect metals above laboratory reporting limits. Although no documented sampling has been performed for the septic to east of the Cover Plant, south of the former Nurse's Station,or west of the former Maintenance Bitilding,it is our opinion, that investigation activities are not warranted at these locations. There is i10 evidence to suggest hazardous materials were disposed in these tanks and sampling at the other septic tank locations did not suggest releases had occurred. 4.1.4 Polychlorinated Biphenyl Containing Transformers Site Summary According to Kleinfelder's AMMC Phase III Assessment Report(Kleinfe der, 1992), there were five PCB-containing transformers on site, although six transformers were described in the report. One transformer was located in the center of the Millwork Building, three were located on the outside southwest corner of the Millwork Building,and two were located on poles between the Box Draft K1361125 workplan-ESC MACTEC Engineering and Corsulting, Inc. 27 September 28,2005