WORK PLANS - Laserfiche WebLink

Home Browse Search

27 January 2004 AGE-NC Project No. 97-0360 Page 5 of 9 • 30 Mav 2003-groundwater levels were measured in monitoring wells MW-1 through MW-5 _ and extraction well EW-1 and approximately ranged from 7.35 feet to 8.79 feet below the tops of the well casings; ground water flow direction at the site was inferred to be flowing towards the north at a gradient of 0.0006 feet/feet. No analytes were detected at or above laboratory reporting limits in any of the ground water samples analyzed. Ground water elevations are summarized in Table 4; analytical results of ground water samples are summarized in Table 5. Results of the May 2003 ground water monitoring event was reported in AGE's Quarterly Report - 2ncl Quarter 2003, dated 16 September 2003. • 14 August 2003- ground water levels were measured in monitoring wcl,]!,MW-1 through MW-5 and one extraction well EW-1 and approximately ranged from Tt feet to 8.07 feet _ below the tops of the well casings; ground water flow direction at the site was inferred to be flowing towards the northwest at a gradient of 4:0006 feet/feet. No analytes were detected at or above laboratory reporting limits in any of the ground water samples analyzed. Ground water elevations are summarized in Table 4; analytical results of ground water samples are summarized in Table 5. 2.4. REGIONAL GEOLOGIC SETTING The site is located within the northern San Joaquin Valley which comprises part of the Great Valley geomorphic province of California. The San Joaquin Valley is formed by the Great Valley geosyncline, which is a large, elongate, northwest-trending asymmetrical structural trough (basin). It is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. This trough has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley. The sedimentary formations range in age with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental-derived sediments were primarily deposited in lacustrine,fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961). The site is located on unconsolidated and semi-consolidated alluvium, lake,playa and terrace deposits of Quaternary age(California Division of Mines and Geology, 1977).The Modesto,Riverbank and Turlock Lake Formations and overlying Recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22). 3.0. GROUND WATER MONITORING EVENTS: JANUARY 2002 TO AUGUST 2003 Ground water monitoring was performed at the site on seven occasions_ 31 January 2002, 13 May -- Advanced GcoEnvironmentai, Inc.