SITE INFORMATION AND CORRESPONDENCE FILE 1

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I 03 August 1999 AGE-NC Project No. 95-0121 Page 3 of 6 The Modesto, Riverbank, Turlock Lake Formations and overlying recent alluvium are the principal source 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. The nearest surface water feature in the vicinity of the property is the Morman Slough, located approximately 5000 feet north of the site. 2 .4. GROUND WATER DEPTH AND FLOW DIRECTION In March 1999, ground water depth was measured at approximately 15 feet below surface grade (bsg); groundwater gradient was calculated at 0.003 (approximately 16 feet per mile) towards the northeast (Quarterly Report - March 1999, dated 23 June 1999, prepared by AGE). Review of historical depth to ground water maps published by the San Joaquin County Flood Control & Water Conservation District (FCD&WCD) dating back to 1971 suggests that ground water depth near the site has fluctuated between approximately 15 and 40 feet bsg. 3.0. SCOPE OF WORK Additional pilot tests are necessary based upon the increasing interval of impacted soil in the saturated zone and the reduction of impacted soil in the vadose zone. AGE proposes to perform the following tasks as part of additional remedial investigation and feasibility studies : • Permitting, planning and pre-field work activities; • Microbial enumeration and physicochemical analysis ; • Six-month ORC pilot study; • Preparation of feasibility/remedial investigation report. 3 . 1 . PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be submitted to the PHS-EHD. As required by PHS-EHD permitting, a health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U. S . Coast Guard and U. S . Environmental Protection Agency, 1985). Prior to drilling activities, each proposed drilling location will be clearly marked and a utility clearance obtained through Underground Service Alert. Advanced GeoEnvironnnental, Inc.