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13 November 2000 AGE-NC Project No. 98-0504 Page 3 of 9 2.5 SITE HYDROGEOLOGIC CONDITIONS The closest surface water feature to the site is Smith Canal and Yosemite Labe, located approximately 1,500 feet northwest of the site. Water fi-om Smith Canal drains into the San Joaquin River Deep Water Channel and is primarily used for commercial and recreational boating. Based upon well information obtained from nearby sites; `mound water flow direction is easterly and is currently estimated to occur at a depth of approximately 25 feet below surface grade (bsg). Ground water occurs in a generally andv laver extendi �_ m imatPl 5 fP�t F,s�7 d-frsuri.�.Rn'� Y---,-�� tomer The sedimentary units are relatively horizontal and continuous over the area. y a"N u 2.6- REGIONt\L. GEOLOGIC CONDITIONS r� I The site is situated within the Great Valley Geomorphic Province of California, a large, elongate northwest tending, asvnunetric structural trough. The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent., creating a nearly flat lying alluvial plain, which extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin The Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys. 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). This basin is drained primarily by the San Joaquin River 3.0. SCOPE OF WORK The scope of the work includes the advancement of up to six soil borings for the install ground water monitoring wells, collection of soil samples andel quarterly grown water monitoring . ive around water wells will be installed at the ro e oI'°I�e at the eastern ed-e of the property down-gradient of the �'wn hydrocarbon release, at the .northeastern corner and northwest corner of the property;`r-7iie south of the fo liST area and e north of the former UST in the area of the highest concentration hydrocarbons�l7f -site a well will need to be installed down gradient of the site, cross Harding Way, 300- feet west of Pacific Avenue. Advanced Geor'.nnIronmciital,Inc.