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i CONDOR EARTH TECHNOLOGIES INC ww 188 Frank West Circle Suite I Stockton CA 95206 Phone 209.234. 0518 CONDOR FAX 4.0538 w.condoreardorearth .com April 21, 2003 EJ ApR 2 2 2003 Jeffrey C. F. Wong ENVIRONMENT HEALTH San Joaquin County Environmental Health Department PERi`IL'IT/SERVICES 304 E. Weber Avenue, Third Floor Stockton, California 95202 Re: Groundwater Monitor Wei! Destruction Report_ Canepa's Car Wash, 6230 Pacific Avenue, Stockton, CA Site Code: 1225; Condor Project No. 1707 Dear Mr. Wong: This report describes the destruction of one monitor well (MW-8) at the above referenced site. Condor Earth Technologies, Inc. (Condor) prepared this report at the request of Mr. Remo Canepa, property owner. On April 11 , 20032 V & W Drilling, Inc. of Isleton, California (C57 License #720904) destroyed the monitor well under the supervision of a Condor geologist. The work was conducted in accordance with the Work Plan for Monitor Well Closure and Monitor Well Installation, dated February 5, 2003, prepared by Condor. A Condor geologist was on site to supervise the work. Prior to commencement of fieldwork, a tailgate safety meeting was held and a site-specific Health and Safety Plan was discussed with, and presented to, all field personnel for their signatures. A well destruction permit was obtained from the San Joaquin County Environmental Health Department (SJCEHD) prior to the fieldwork, and the SJCEHD was notified approximately 72 hours in advance of the fieldwork. In a telephone conversation on the morning of April 11 , 2003, you indicated that well destruction activities were not to begin until you arrived on site. After your arrival, the depth to the bottom of the well casing was measured at 64.9 feet below ground surface (bgs). The well installation log indicated the total depth of the well is 65 feet bgs se the well had . . tuae seddir ent in the bottom You then gave permission to begin the well destruction activities. A tremie pipe was lowered into the casing and extended to within one foot of the bottom of the casing. Neat cement grout was pumped into the tremie pipe until grout flowed out of the top of the casing. Water displaced out of the top of the casing by the grout was captured in buckets. The tremie pipe was removed from the casing, and a compressed air line was attached to the top of the casing. Air pressure was applied to the casing and maintained at a pressure of 30 pounds per square inch to allow full penetration of the grout into the sand pack and formation. The compressed air line was removed and the upper five feet of the casing was drilled out using an eight-inch hollow-stem auger. Neat cement grout was poured into the open borehole and filled the boring to the ground surface. Our calculations indicated approximately 25 .4