ARCHIVED REPORTS_1993_1 - Laserfiche WebLink

Home Browse Search

' CHAPTER 7.0 GROUND RELIEF FEATURES A. ENVIRONMENTAL SETTING ' The site lies south of the Cit of Stockton, north of the City of Manteca and east of Interstate 5. The current site is bounded on the south by Lovelace Road, on the west by farmland, on the north and east by vacant land. The proposed site expansion will include a portion of the farmland to the west. The surrounding topography is primarily flat and used for farmland and orchards. The vacant property to the east has relief features with an approximate 16-foot elevation differential. These features appear to have been created through soil stockpiling and excavation, and are not naturally occurring. The current facilityhas a depressed retention pond on the northeast quarter of the site. The contour maof the site indicates the approximate dimensions of the existing ' rectangular retention pond to be 8-feet deep, 120-feet wide and 190-feet long. The planned expanded facility would require backfilling the existing retention pond and excavating a new retention pond in the western portion of the site. ' The remainder of the site is relatively flat with the exception of operational improvements to accommodate waste transfer. These consist primarily of the transfer tunnel and the new storm water retention pond on the western portion of the site. The ' grading plan and utility plan show a number of storm water inrets tied together which feed to the new stormwater retention pond. ' The on-site soils are characterized by the Soil Conservation Services as Veritas fine sandy loam (VH, DN). The soil profile has a light gray and white weakly cemented to indurated hardpan at depths between 40 to 60 inches. Permeability of this soil is moderately rapid. The hazard of water erosion is slight. (United States Department of Agriculture, 1988) A subsurface exploration program was conducted by Kleinfelder (1993; Refer to Appendix F) A boring 40-feet in depth was performed at the proposed retention pond location. This boring shows primarily silty sand (SM) to a deth of approximately 10 feet. From a depth of 10-feet to 40-feet are layers of silty clay 1CL). Groundwater was ' encountered at a depth of approximately 28 feet. This groundwater depth is consistent with the Spring 1992 Groundwater Report for San Joaquin County. B. ENVIRONMENTAL IMPACTS ' No environmental impacts related to ground relief features have been identified. 7-1