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I' REPORT OF ADDITIONAL MONITORING WELL INSTALLA'T'IONS MANTECA BEAN COMPANY MANT£CA, CALIFORNIA I, SUTqn5try f Work Performed one well permit application covering two monitoring wells was submitted and approved on December 8, 1987 (Appendix A) . Drilling and associated soil sampling began on December 21, Dling riland was completed an December 22, 1987• The locations 1987 of the two new monitoring wells, MW-7 and MW-8, are shown an Plate 1 in Appendix B. The boreholes were advanced by Water Development Corporation using a Simco the desired drill sampling depths.rig and The augerslwere low shot augers to each well. water (200' F) pre sure cleaned prior to drilling Twelve (12)-inch 0.D. hollow stem The ers were used as a 12-inch augers were temporary surface casing in MW-7. advanced to 25 feet, where 8-inch augers were used inside them to advance the borehole to its total depth 8-inch f 50 fOeD. Mw-8 reached a total depth of oSamPl�sewE recollected at five hollow stem augers• foot intervals from the ground surface to total depth with a 2-inch I.D. modified California Sampler with brass sleeves. were The soil samples retained in stic rend sleeves aps Vetightly examined, sealed with teflon, plastic in cold storage for wrapped with tape, labeled, and kep A geologic/soil lag transport to the chemical laboratory• the drilling for each well was kept in the field during of cover plasticoand covered pending laboratory er cuttings were danalysison 6 . poly- cover The boring logs containing sample intervals, subsoil penetrated, and well cr:,,eruction details of MW-7 conditions peendix C. The two (2) monitoring and MW-8 can ne found in Ar, wells, MW-7 and MW-40 were completed m le ed enedusing 2 s ctionsC (0020 jointed, schedule pressure inch slat size) . The casing was hot water (200"F) cleaned before placement into the hwith`r a stem 2minrhers. The threaded bottom of the casing was cape flush--joint PVC cap. The annular space h the well was backfilled through the hollow stem augers (which were pufeet up in 5 foot sections) with Lonestar 03 sand to two (2) foot above the top of the screen section- the sand two (and the bentonite seal was placed on top -_remaining annular space was with a--flush-cover, was ginstalled watertight locking._. _..._ m� at least 1-inch higher than the surrounding surface...._._._ e....__.