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20 September 2002 <br /> • AGE-NC Project No 97-0343 <br /> IPage 2 of 7 <br /> in the north The westem and eastern boundaries of this province are comprised of the California <br /> Coast Range and the Sierra Nevada, respectively Rocks composing the basement complex of the <br /> province have not been completely defined but are believed to be metamorphic and igneous origin <br /> The northern and southern portions of the Great Valley Province have been designated the <br /> Sacramento and San Joaquin Valleys, respectively <br /> The Modesto,Riverbank, Turlock Lake Formations and overlying recent alluvium are the principal <br /> source of domestic ground water in the 13,500-square-mile San Joaquin Valley Ground Water Basin <br /> (Basin 5-22) This basin is drained primarily by the San Joaquin River The nearest surface water <br /> feature in the vicinity of the property is the Stockton Diverting Canal located approximately 300 feet <br /> north of the site <br /> I2 2 GROUND WATER DEPTH AND GRADIENT <br />' Based upon data collected from on-site monitoring wells in May 2002, ground water was at a depth <br /> of approximately 55 feet bsg and flowed toward the northwest under an average gradient of <br /> I 0 003 fl/ft, the low directions may be both locally and seasonably variable The uppermost ground <br /> water flows in an unconfined aquifer,but with increasing depth,the aquifer becomes semi-confined <br /> due to the presence of fine-grained strata <br /> IThe Stockton Diverting Canal is located adjacent to the site The canal usually contains little water <br /> and does not appeared to have a significant effect upon ground water depth or flow direction in the <br /> area, however the canal could be the cause of significant seasonal fluctuations in ground water flow <br /> direction and depth at the site <br /> 3.0. SCOPE OF WORK <br /> Based on data accumulated from the January 2002 cone penetrometer testing (CPT) investigation <br /> AGE proposes to install one deep-screened ground water monitoring well to monitor petroleum <br /> hydrocarbon-impacted ground water in the area of boring CPT-1 The assessment activities will <br /> consist of the following tasks <br /> • Permitting and pre-field work activities, <br /> I • Drilling and soil sample collection, <br /> • Monitoring well installation and development, <br /> • Ground water sample collection, <br /> S • Preparation of a report of findings <br /> IAdvanced GeoEnviron mental,Inc <br /> I <br />