ARCHIVED REPORTS - GROUNDWATER MONITORING WELL INSTALLATION AND LIMITED SOIL SAMPLING

Home Browse Search

hn KLEINFELDER ' 2 SITE SETTING 2.1. SITE LOCATION The site assessed is located along the southern portion of the city block north of West Sonora ' Street, east of Commerce Street and west of Center Street in Stockton, California. The site encompasses seven individual parcels; assessors parcel numbers 137-310-10, -11, -12, -13, -14, - 16, and -17. 2.2. CURRENT USE AND SITE CHARACTERISTICS ' The site is currently vacant with the exception of the former Elks Lodge Building located on ' parcel 137-310-10. The former Elks Lodge building appears to be currently closed as evidenced by the "boarded up" nature of the doors and windows. The remaining parcels are vacant and cleared of obvious debris and overgrown by weeds. ' 2.3. REGIONAL GEOLOGY AND HYDROGEOLOGY ' The site lies within the central portion of the Great Valley Geomorphic Province of California near the mouth of the delta which drains to San Francisco Bay. The valley is approximately 400 ' miles long and averages about 50 miles wide, and comprises about 20,000 square miles. The valley has been filled with a thick sequence of marine and non-marine sediments from the late Jurassic to Holocene. The uppermost strata of the Great Valley represent, for the most part, the ' alluvial, flood, and delta plains of two major rivers (Sacramento and San Joaquin Rivers) and their tributaries. The valley deposits are generally derived from the Coast Ranges to the west and the Sierra Nevada to the east. Granitic and metamorphic rocks outcrop along the eastern and southeastern flanks of ' the valley. Marine sedimentary rocks outcrop along most of the western, southwestern, southern, and southeastern flanks; and volcanic rocks and deposits outcrop along the northeastern flanks of the valley. The valley geomorphology includes dissected uplands, low alluvial plains and fans, ' river flood plains and channels, and overflow lands and lake bottoms. The majority of the native sediments near the site consist of Miocene to Holocene continental rocks and deposits of a heterogeneous mixture of generally poorly sorted clay, silt, sand, and gravel. Some beds of ' claystone, siltstone, sandstone, and conglomerate are also present. Review of the California Division of Mines and Geology "Geologic Map of the San Francisco — ' San Jose Quadrangle," indicates that the site is underlain by Quaternary alluvial fan deposits of the Modesto Formation. ' 42162.E01/ST0411854 Page 5 of 22 Copyright 2004,Kleinfelder,Inc. July 1,2004 1