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i' Environmental Consultants 6761 Sierra Court 510 829-0661 Suite D 510 829-5493 FAX Dublin, CA 94568-2611 Offices Nationwide March 10, 1995 File No. 0394015.01 Dear Gabe: This letter documents SCS Engineers (SCS) activities related to abandonment of former landfill gas (LFG) monitoring wells at the subject site. BACKGROUND In 1988, a network of six LFG monitoring wells were installed at the site be EMCON Associates as part of the Air Quality Solid Waste Assessment Test (Air SWAT) program. The Air SWAT wells, designated P-1 through P-6, were installed in native soils outside the landfill perimeter, to a depth of approximately 8 ft below ground surface. Air SWAT monitoring well locations are shown on the attached site plan. A sketch prepared by EMCON showing typical Air SWAT monitoring well construction details is also attached. Under a separate contract, SCS was retained by the San Joaquin County Department of Public Works (County) to design and install a network of new subsurface LFG monitoring wells, per current state and federal regulations. These new monitoring wells will replace the Air SWAT wells. SCS was subsequently retained to properly abandon the Air SWAT wells. SCS's scope of work for this engagement is outlined in our December 5, 1994, proposal to your office and included preparation of a permit application, oversight of Air SWAT well abandonment activities, and preparation of this letter report. SWAT Well Locations County DPW crews were responsible for marking the locations of the Air SWAT monitoring wells. Note that well P-5 could not be located. This SWAT well was installed near the existing perimeter road and is believed to have been destroyed as a result of normal landfill operations. V72 © 5c; rn C= %.n m Mr. Gabe Karam San Joaquin County m Department of Public Works o 4? 1810 East Hazelton Avenue Stockton, California 95201 C/) Subject: Air SWAT Landfill Gas Monitoring Well Abandonment, Corral Hollow Landfill Dear Gabe: This letter documents SCS Engineers (SCS) activities related to abandonment of former landfill gas (LFG) monitoring wells at the subject site. BACKGROUND In 1988, a network of six LFG monitoring wells were installed at the site be EMCON Associates as part of the Air Quality Solid Waste Assessment Test (Air SWAT) program. The Air SWAT wells, designated P-1 through P-6, were installed in native soils outside the landfill perimeter, to a depth of approximately 8 ft below ground surface. Air SWAT monitoring well locations are shown on the attached site plan. A sketch prepared by EMCON showing typical Air SWAT monitoring well construction details is also attached. Under a separate contract, SCS was retained by the San Joaquin County Department of Public Works (County) to design and install a network of new subsurface LFG monitoring wells, per current state and federal regulations. These new monitoring wells will replace the Air SWAT wells. SCS was subsequently retained to properly abandon the Air SWAT wells. SCS's scope of work for this engagement is outlined in our December 5, 1994, proposal to your office and included preparation of a permit application, oversight of Air SWAT well abandonment activities, and preparation of this letter report. SWAT Well Locations County DPW crews were responsible for marking the locations of the Air SWAT monitoring wells. Note that well P-5 could not be located. This SWAT well was installed near the existing perimeter road and is believed to have been destroyed as a result of normal landfill operations. V72