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Advanced GeoEnv i ronmental Inc . - 18 May 1998 AGE-NC Project No. 95-0112 Ms. Margaret Lagorio SAN JOAQUIN COUNTY PHS-EHD 304 East Weber Avenue, Third Floor Stockton, CA 95202 Subject: Monitoring Well Destruction 1 Site Cleanup ART & ARTISTS 204 East Lodi Avenue, Lodi, California Dear Ms. Lagorio: At the request of Ms. Mary Lehr, Advanced Geo Environmental, Inc. (AGE) has performed the abandonment of eight ground water monitoring wells, two air sparbing «ells and one vapor extraction well at and near 204 East Lodi Avenue in Lodi, California. Well destruction was performed on 31 March and 01 April 1998 by Central Valley Drilling of Rancho Cordova. Each well was filled with portland cement; pressure of approximately 20 psi ;vas applied to each well for approximately three minutes to ensure grout penetration into the filter pack. Monitoring well MW-I was over-drilled to a depth of approximately 45 feet below surface grade (bsg); vapor extraction well VW-I was over-drilled to a depth of approximately 10 feet bsg. The remaining wells were over-drilled to a depth of approximately 5 feet bsg. Monitoring wells MW-2 and MW-5, located in a dirt lot, were filled to approximately one foot bsg with neat cement. The top foot was backfilled with native soil. The remaining wells were filled to surface grade with portland cement. Abandonment procedures were observed by Mr. Harlin Knoll of your office. On 05 May 1998, the former UST location was resurfaced. The underlying dirt was smoothed to a depth of approximately four inches bsg. A concrete pad was then installed to match the surrounding surface. The City of Lodi Public Works Department was contacted regarding disposal of purge water to the sanitary sewer system. On 13 May 1998, the remaining purge water stored on-site, approximately 110 gallons, was transported to a City of Lodi pumping station at 1331 South Ham Lane and disposed. " dcPholle (2101)) 467-1006 FAX ('01) .167-1 1 18