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February 11, 2005 .NOA Project Number: E04146A One domestic well was observed to the south of the barn. Two propane tanks were observed in the vicinity of the residences_�-One approximately 100-gallon tank that appeared to be empty and several _ piles of metal debris were observed behind the barn. Several empty, plastic drums were observed behind the outbuilding;these were labeled as containing an"environmentally safe"soil sealant. Several empty,plastic, five-gallon chemical buckets were also observed behind the outbuilding. V_Six pole-mounted transformers were observed on the subject property; one was marked with a blue, PCB-free sticker, and all appeared new. ✓ The soil surface of the subject property was not visible during the site visit due to the presence of seasonal vegetation and muddy areas;because of these conditions,it was'not possible to assess the soil i_ surface for staining. i� i Surrounding properties were surveyed at the time of the site reconnaissance. To the immediate west of the subject property, a burned area with the remains of.a vehicle, several drums, and other debris, marked the former location of a barn on the adjacent property. An above-ground storage tank, a second abandoned vehicle,and other debris lay nearby. Aside from this area, surrounding properties to the west,east, and south were agricultural land. To the north was the Mokelumne River, followed by agricultural land with a few structures. y3.2 Past On-Site Sources of Contamination No potential above- or below-ground on-site potential or known sources of contamination were identified from past uses of the site, except for the following: • Paraquat was applied to the subject property in 2004. Paraquat is highly toxic and extremely persistent. Other agricultural chemicals have also been mixed on and applied to the property. Because of the age of the second dwelling unit on the subject property,it is possible that lead- based paints and/or asbestos-containing materials were used in its construction. /,'33 Current On-Site Sources of Contamination No above-or below-ground on-site potential or known sources of contamination were identified from current uses of the site, except for the following: Agricultural chemicals are mixed and applied on the property. The mixing locations are near the domestic well and adjacent to the pump at the northeast corner of the property. Empty chemical containers are temporarily stored on the property. Vehicular maintenance takes place on the property. O staining to concrete was observed in one outbuilding. 8