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Mr. Gabe Karam ' March 10, 1995 Page 2 Permit Application SCS prepared a brief work plan and permit application for the SWAT well abandonment. These items and the permit fee were submitted to the San Joaquin County Environmental Health Department (EHD) on December 16, 1994. A copy of this application was forwarded to your office. Aaencv Notification + On February 27, 1995, SCS notified the EHD of our proposed schedule for the field work.' EHD requires advance notification in the event they wish to be present to observe well abandonment. The EHD was not able to schedule a field inspector on the dates of SCS's field work. Field Activities Air SWAT monitoring well abandonment activities took place on March 1 and 2, 1995. All field work was overseen by Karl N Barber, SCS's Staff Geologist. Work included: • Removal of existing vault boxes. • Drilling out the SWAT well borings. SCS retained Spectrum Exploration (Stockton, California) as a drilling subcontractor. Wells P-1 through P-4 and P-6 were drilled out using a rig equipped with an 8 -inch diameter hollow stem auger. The borings extended to a depth of 10 ft. In each instance, the borings were advanced until native soils were encountered (i.e., there was clear indication that all previous backfill materials such as soil cuttings and pea gravel had been removed). • Backfilling the borings to full depth using a neat cement grout. Photographs of selected wells were taken after grouting and are on file with SCS and can be made available if requested. CLOSING This letter certifies that the 5 former Air SWAT LFG wells were properly abandoned in accordance with standards of professional care for such work. All field work was performed by an SCS professional under the direction of a licensed civil engineer. We recommend the County forward a copy of this letter to the EHD to complete that agency's project file.