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� P HE41 III GeofogicdTechnics Inc. 2741 Pow Ry df MO&Vto,C48fMW 95351 U (209)538-6424IFoK#538-5852 December 5, 1997 Project No.: 8.2 Project Name: B.C.&D Properties Mr. Robert J. Burick 350 Via Concha Aptos, CA 95003 RE: Well Abandonnient/Closure Report BC&D Properties, 1129 W. 11 Street, Tracy, CA Dear Mr. Burick: On behalf of Mr. Robert J. Burick, agent for BC&D Properties, Geological Technics Inc. (GTI) transmits the following summary of activities performed on December 2, 1997, to facilitate Mr. Burick's obligation for closure of the gasoline tank remedial action project at 1129 W. Eleventh St.,Tracy, CA. Monitoring Well Abandonment • In the morning of December 2, 1997 GTI personnel, along with V&W Drilling (C57# 720904), mobilized to the site and monitoring wells,MW-1,2, 3, and 4 were abandoned. • The grout installation included pressure installing grout using a slurry pump and tremie pipe until a mushroom over the top of casing had been formed(Figure 2). • Neat cement grout(Type I/II Portland with about 4%bentonite), was used to close the wells. • In completing the grouting of the casing, grout volumes were tracked in order to see how measured volumes compared to estimated volumes, volumes were measured to the nearest 5 gallons in the field so there is some error. Both the theoretical and actual volume data is included in Table 1. In all cases the installed volume exceeded the estimated casing volume. The discrepancy may be due in part to grout moving out into the filter pack material, error in the measurement of installed grout volumes. • Except for MW-4, the well boxes were removed as follows: the concrete collars were broken out with a sledge hammer,well boxes removed,the soil around the former well box drilled to four feet below grade, the casings and conductor casing(if installed) were cut. • Since MW4 is located in the sidewalk,the well box was not removed. The well box lid was removed, the well pressure grouted, and the well box filled with concrete flush with the sidewalk.