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. 1 u Phase I Environmental Site Assessment City of Stockton Multi-Modal Station/Shopping Center Page 29 5 2 GENERAL SITE SETTING tiThe site is located in the geological region known as the Great Valley The soils of the Great Valley were a farmed in alluvium derived from maxed rock sources of the Coast Range and from granitic rock sources of the Sierra Nevada The soils in the area of the Site are classified as "urban land" according to the Soil Survey of San Joaquin County, California Geologic conditions at depth are relatively well known as a result of exploratory and production drilling for the nearby french Camp, Lathrop, and Stockton natural gas fields The surface alluvium covering the site is underlain by more than 3,000 feet of Pliocene and Miocene age non-marine sands and clays These non-marine deposits unconformably overlie an estimated 9,000 to 10,000 feet of Cretaceous marine sands 9 and shales (Hoffinan, 1997) The Upper Crctaccous sand units of the Great Valley Sequence are the primary natural gas producing units The Cretaceous deposits are underlain by basement rock belonging to the Franciscan Assemblage or the Sierra Nevada Granitics and Metamorphics 5 2 1 Surface Drainage The site does not appear to receive significant runoff from other properties Drainage from the site and adjacent properties appears to flow to the adjacent streets where it is conveyed to the city storm drainage system w 5 2.2 Groundwater Groundwater monitoring activities at nearby propertiesindicate the general groundwater gradient in the vicinity of the site is to the east, with the gradient at individual sites ranging from the northeast to the s s southeast The site may receive groundwater flow from properties to the northwest, west, and southwest w Addresses that appeared during the government database search are listed in Table 8 with their iapproximate distance from the site and their gradient position with respect to the site Table 8—Off-sate Addresses with Distance and Gradient Position Distance Gradient Address from Site Position With Respect to Site 224 N AMERICAN ST 400 up 225 N AMERICAN ST 200 up , 444 N AMERICAN ST 850 cross 511 N AMERICAN ST 1,000 cross 29N AURORA ST 200 up 330N AURORA ST 300 cross 331 N AURORA ST 165 cross 422 N AURORA ST 600 cross 446 N AURORA ST 570 cross 540 N AURORA ST 1,100 cross 17S AURORA ST 565 cross to up 120S AURORA ST 1,000 cross to up 400S AURORA ST 2,000 cross BETWEEN LINDSAY STREET&.DEEP W 3,200 39N CALIFORNIA ST 1,000 up 240 N CALIFORNIA ST 750 up to cross 420 N CALIFORNIA ST 1,000 r r tJ CONDOR