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Stantec February 4,2009 Mr. Robert Aragon Page 2 of 4 Re:Well Abandonment Work Pian tanks, and lampblack separators. Two water wells of an unknown construction and depth are present near the center of the Site and are the wells proposed to be abandoned. Located along the northern boundary of the Site was a possible third well that, based on field investigations, was determined not to be a well. FORMER WATER WELLS The two wells to be abandoned are located at the northern central area of the Site and are of unknown construction. The wells are identified on the original 1926 site plan as part of the MGP facility and are believed to have been water supply wells for use in association with MGP operations. The wells currently appear as 6- to 9-inch diameter steel casings cut flush with ground surface. The casings at surface are misshapen and not perfectly round. One of the casings appeared to have been filled with concrete to ground surface, however, upon further investigation, was found only to have a concrete cap approximately 2-to 3-inches thick. This well casing was measured to be open to 19.4 feet below ground surface (bgs). A direct-push rod was advanced to the bottom of the well and soil is believed to be at the bottom. The second well casing, located more easterly than the other, was measured to be open to 8 feet bgs, and soil is believed to be at the bottom. PROPOSED SCOPE OF WORK The proposed well abandonment activities consist of six primary tasks including: Task 1—Preliminary Field Activities; Task 2—Water Well Investigation; Task 3—Video Logging; Task 4—Water Well Abandonment; Task 5—Investigation Derived Waste Disposal; and Task 6—Reporting. Each task is further described below. TASK 1—PRELIMINARY FIELD ACTIVITIES Stantec has obtained a well destruction permit from the San Joaquin County Environmental Health Department (SJCEHD). The well destruction permit will be on-site at all times during well abandonment activities. The site-specific Health and Safety Plan (HASP) will be updated for use by personnel implementing the Work Plan. The HASP will address the proposed activities. A copy of the HASP will be available on-site at all times. The subcontractor(s) performing the field activities will be provided a copy of the HASP prior to initiating field activities. The on-site subcontractors will also be required to maintain their own HASP. Stantec will mark the drilling locations, contact Underground Service Alert(USA)at least 48 hours prior to the initiation of field work, and contract with a private utility locator(California Utility Surveys) to clear the drilling locations prior to the start of work.