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4 Bennett Properties December 28, 1987 Page 4 a an intermediate aquifer with the water level at 20 to 25 feet depth; and, a a deep aquifer with the water level at approximately 150 to 200 feet depth. Water from the water table zone is used primarily for irrigation, and the upper groundwater level varies according to seasonal changes and pumping rates (Bologna, 1987) . The intermediate aquifer is used for some private water sup- ply; this is the aquifer in which the on-site well is likely constructed. This aquifer has had some salt water intrusion problems; future actions to remEdiate this may involve establishment of recharge ponds (Boll, 1987) . The deep aquifer is used by the City of Manteca for its domestic water supply (Koester, 1987) . The direction of the groundwater flow in the shallow water table is toward the French Camp Canal, to the west (Bologna, 1987) . The groundwater gradient, as reported in the San Joaquin County Flood Control and Water Conservation Dis- trict map of Summer 1984, is to the south to southwest (Boll, 1987) . SITE HISTORY Following are descriptions of site usages and facilities, based on the in- formation provided by our references. They are presented in chronological or- der, beginning with the earliest years for which we obtained information. The site consists of lots 5, 6, 7 and 8 of the Grove Addition (see Parcel Plan, Plate 3) (designated as 20, 21, 22 and 24 on the 1979 Assesor's Map) . It Was part of San Joaquin County until annexed by the City of Manteca approximate- ly five years ago (Cantu, 1987) . The earliest known County Surveyor 's map, dated 1909, shows the present site as owned by A.E. Muenter (Manteca Bulletin, 1976) . In 1917, sugar beets were a major crop in the Manteca area. The Spreckels refinery was located one mile southeast of town. Other agricultural land uses also flourished in the area (Manteca Bulletin, 1976) .