Laserfiche WebLink
Sacramento River and the San Joaquin River. The Sacramento-San Joaquin Delta extends <br /> approximately 48 miles north from Tom Paine Slough to Clarksburg, California and <br /> approximately 31 miles from Stockton to the east end of Suisin Bay. The Delta is bounded to the <br /> north, east, and south by Quaternary sediments filling the Central Valley and to the west and <br /> southwest by sedimentary rocks of the Coast Ranges of California. <br /> Delta sediments are fine-grained compared to valley fill sediments because of the low gradients <br /> of the Sacramento and San Joaquin Rivers through the delta. Delta sediments are composed <br /> primarily of silt and clay with minor sand and gravel. Delta sediments also contain large <br /> quantities of organic soils (muck) and less abundant peat (Tetra Tech EM Inc. 1998). <br /> The delta deposits underlying RRI are laterally contiguous with coarser-grained valley fill <br /> deposits in the San Joaquin Valley to the east (Tetra Tech EM Inc. 1998). The surface exposure <br /> of the contact between the valley fill and delta deposits is located approximately 1.25 miles east <br /> of RRI. Significant quantities of groundwater are not produced from the delta deposits because <br /> delta deposits are fine grained and/or contain brackish groundwater at most locations (Tetra Tech <br /> EM Inc. 1998). However local occurrence of fresh (non-brackish) groundwater has been <br /> recognized in the delta deposits. <br /> Rough&Ready Island 3 Tetra Tech,Inc. <br /> Revised Draft Work Plan November 18, 1998 <br />