FIELD DOCUMENTS AND WORK PLANS 1990

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North Yard- The North Yard contains a wood treatment facility (retort) , treated wood storage areas, and a stormwater and ground water treatment system. Wood treatment at MCTC began in 1966. The wood is loaded into pressure vessels or retorts where an inorganic wood preservative solution is forced into the wood under pressure. Chromium, copper, and arsenic have been used as components of the wood preservative solution. In 1982 , arsenic was eliminated from the preservative solution and only copper and chromium are now used. The site is bordered by a mix of land uses. To the north and east of the North Yard are storage areas for vehicles of a commercial trucking operation. Franklin High School is adjacent to the site. To the south, east, and west of the South Yard are residential areas. Soils around and under the MCTC site have been affected in several locations as a result of wood treating activities on the Site. Levels of chromium have exceeded federal and state drinking water standards in the groundwater under and down gradient from the MCTC site . The reader is referred to the attached figures for a plan view of known ground water contamination; figures are from Section 3 of the full volume draft RAP. NATURE AND EXTENT OF CONTAMINATION Extensive soil and groundwater assessment programs and an assessment of the public health and environmental risks have defined the nature and extent of contamination. The site has been divided into four operable units to facilitate development of remedial action alternatives. The four operable units are as follows: o Surface Soils o Pipes and Culverts on or near South Yard o Subsurface Soils beneath retorts o Groundwater SUMMARY OF REMEDIAL INVESTIGATION Surface Soil Contamination Offsite surface soils apparently have been affected in some locations by past wood treatment and treated wood storage operations at the facility. The contamination ES-2