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Phase E Environmental Site Assessment Neighborhoods D,K,L,and Town Center,Mountain House,California Page 13 On the 1978 map, the pipeline is no longer indicated and a building was removed along the southern boundary of Neighborhood D. In Town Center, one of the small structures appears as a bam and the access road encircles the remaining small.structure. The northeastern structure is no longer indicated. In Neighborhood K, the pump is no longer indicated and intermittent waterways are located throughout the properties: most are north/south trending and appear to connect to a waterway that follows the contours of the river and northern boundary. In Neighborhood L, the barn and the orchard are no longer indicated and the access road extends to the levee (north). Sea level is indicated south of the northern boundaries in Neighborhoods.K and L. In addition to the USGS maps, Condor has acquired copies of other historic maps in the past several years in conjunction with a varietyof Site activities. One ma appears to be a Pacific Gas and Electric P pp Company(PG&E) map identified only as Mendota—Richmond, Sheet 22 of 33, From M.P. 220+77 P to M.P. 225. This map, dated 1937 with the last update of 1944, shows the PG&E pipeline (Old Valley Pipeline) and adjacent structures, the railroad, and Byron Road. Located in the nor-them boundary of Town Center is an 8-inch PG&E gas line. At the northeast comer of Town Center (southwest corner of Mountain House Parkway and Byron Road) is a 6-inch PG&E gas line, a service station, a toilet, and a church. Aerial photographs dated 1957, 1963, 1982, and 1993 were reviewed. The 1957. photograph shows Neighborhood D as agricultural land with a small farm complex along the southern tree-lined boundary road. A bam, house, small outbuildings, and possible corral area are located within the farm complex. An irrigation ditch is located along the northernperimeter of the farm complex. A northwest/southeast trending feature(possible underground pipeline location) extends across Neighborhood D and through the adjoining southern property. Irrigation ditches are located in the northern and in the southwestern portions of the Neighborhood D. In Town Center, a large farm complex is located southeast of a northeast/southwest trending creek. Six large buildings, a house, several fenced pen areas, and small outbuildings are located within the perimeter of the farm complex. The surrounding land is used as agricultural fields. Possibly three small structures and a yard are located in the northeastern corner of Town Center. Roads are located along the northern and eastern boundaries of Town Center. The 1957 aerials for Neighborhoods K and L are of poor quality. The neighborhoods are agricultural land with a river located along the northern boundaries. Irrigation ditches (with associated farm roads) form networks across the neighborhoods. A tributary of the river extends south-southwest onto Neighborhood L. A farm complex is located east of the tributary. An .access road extends from the farm complex through the southern adjoining properties to a road. The road extends along the southern boundary of the western portion of Neighborhood L. A portion of a farm complex is located along the southwestern.comer of Neighborhood L. Three narrow trace features (possible roadways, drainages; or underground lines) are located west of the tributary in Neighborhoods K.and L. The 1963 photograph shows a second northwest/southeast trending feature (possible underground pipeline location) extending across Neighborhood D towards the adjoining eastern property. The irrigation ditch north of the small farm complex in Neighborhood D is removed. A possible power tower is located in the southeastern corner of Neighborhood D. No changes are apparent in the 1963 photograph for Town Center or Neighborhood L. Two small structures are located along the northern irrigation waterway in Neighborhood K. The two northwest/southeast-trending features in Neighborhood D are no longer distinguishable in the 1982 photograph. A house and yard are located east of the farm complex along the southern boundary of i Neighborhood D. No changes are apparent in the 1982 photograph for Town Center. The three narrow trace features located west of the tributary in Neighborhoods K and L are no longer apparent. t A - � �ir1� CON©OR