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I PROOLEM ASSESSMENT REPORT 1806 South El Oarado Street Stockton California section of the San Joaquin Valley, in the southern section of the Central Valley Province The San Joaquin Valley is bounded by the Sierra Nevada in the east and the Coast Ranges ,n the west ' Several thousand feet of unconsolidated silty, sandy, and gravelly sediments lie within the basin Subsurface investigations at the site indicated predominantly clay and silt with lesser amounts of sand from the surface to a depth of approximately 60 feet bs ' The oldest significant water-bearing zone e in the Stockton area is the Mehrten Formation on the east side of the county The underlying Valley Springs formation produces minor quantities of fresh water The Mehrten Formation plunges into the valley from the east at approximately one to two degrees, reaching a depth of about I800 to 1000 feet bs and between 400 to 600 feet in thickness in the Stockton area Regional drainage is towards central Stockton, immediately north of the site The nearest water body is the Mormon Slough about 0 8 miles north of the site Duck Creek is south southeast of the site by approximately 1 3 miles Depth to groundwater in the monitoring wells on site has varied from approximately 42 to 48 feet bs Groundwater elevation measurements have indicated relatively consistent flow to the east-northeast at an approximate gradient of 0 001 ft/ft 2 6 Water Well Survey Well records were researched by Aegis personnel in July 1991 at the California Department of Water Resources in Sacramento, California The records search included active and inactive municipal, agricultural, industrial, domestic water, and test I wells within a 2,000-foot-radius of the site Only one well was reported within the 2,000-foot radius ILocation Owner Use Distance from Site Township 1 [North Range California Water Municipal Approximately 6 East Section 14 Track Service Company well 650 feet north F - between Jackson and Clay Streets and between Center and South El Dorado Street I 91 044A PAR y