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MOUNTAIN HOUSE NEIGHBORHOODS KANU L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST 7.HAZARDS the greatest source of hazardous materials(Condor, 2004x). Currently,the greater portions of the Neighborhoods K and L sites are fallow,with the �{ exception of limited areas that are still farmed. Structures associated with agricultural use that were formerly located on the _ Neighborhoods K and L project site include irrigation-related piping and drainage ditches, a residence and a small garage in Neighborhood L, and two effluent storage reservoirs in the southeastern portion of Neighborhood L associated with the wastewater treatment plant located on the adjacent parcel. Around 1992,the residence in Neighborhood L was torn down and two or three wells were reportedly abandoned in accordance with regulatory requirements(Condor, 2004a). The results of a Phase I ESA site reconnaissance indicate that in 2004 a small garage and a large pole barn with bales of hay and construction piping stored around it were located in the southwestern corner of Neighborhood L. The eastern portion of Neighborhood L was under agricultural production and irrigated with effluent from the adjacent wastewater treatment plant. An irrigation _ pond, pump catwalk, and piping were observed in the northwestern portion of Neighborhood L; the southeastern portion of Neighborhood L had two reservoirs belonging to the Mountain House Community Services District.The majority of ' Neighborhood K site was used as agricultural land, but the eastern portion of the site was used to facilitate construction of Mountain House (e.g.,storage of soils, etc.). Two water pumps, irrigation piping, stand pipes,and monitoring wells were also observed on the Neighborhood K site. Review of aerial photography on Google Earth(2010)suggests that all former r agricultural buildings have been removed from the Neighborhoods K and L ( project site.The two effluent storage reservoirs are still present in Neighbor- F1 hood L. On-Site Fuel Storage In 2004, at the time of the Phase I ESA site reconnaissance, an approximately 20-gallon gasoline or diesel fuel aboveground storage tank(AST)was observed outside of the small garage located in the southwestern corner of Neighbor- hood L. No indications of leaks or spills were observed (Condor, 2004a). I� Electrical Transformers Between the 1930s and 1970s, polychlorinated biphenyls(PCBs)were commonly used as a replacement for the oil bath in electrical transformers and capacitors. Studies have shown that PCBs may be carcinogenic to humans. In 1976, concern over the toxicity and persistence of PCBs in the environment led Congress to enact the Toxic Substances Control Act(TSCA),which included, among other things, prohibitions on the manufacture, processing,and distribution in commerce of PCBs. i ' (9f711 1) 5-85 i'