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r <br /> s REPORT OF ADDITIONAL <br /> " MONITOR11TG WELL INSTAL?}ATIONS <br /> MANTECA ALIFORNfA <br /> �,}iTECA, <br /> 0 <br /> Summa of Work Performed <br /> two 'monitoring wells <br /> permit application covering (Appendix ,�) - <br /> One well t roved on December 8, 1987 Dec <br /> was submi.ted and app began on December 21, <br /> ns <br /> Drilling and associated soil sampling <br /> 1987 and was completed o welis,December�7 sand BMW-8,Tare lshownoon <br /> of the two newni B. <br /> Plate 1 in Appendix <br /> Water Development hoo w astem <br /> The boreholes were advanced by and 8-inch O.D. <br /> using a Simco 5600 drill rig depths. The augers were hot <br /> augers tc the desired sampling riot to drilling each well. <br /> water (2o0' F) pressure cleaned p augers were used as e <br /> Twelve <br /> (12)-inch O.D. hollow stem aug <br /> surface casing in MW-7. The 12-inch augers were <br /> temporary where 8-inch augers were used inside <br /> advanced to 25 feet, only B-inch O.D. <br /> them to advance the boreholedepth <br /> of 30 feet using Only <br /> of Satffive <br /> .•A IIW--B reached a total deg depth <br /> with a <br /> hollow stem augers• soil samples were collects <br /> eves <br /> foot intervals from the ground surface to total deP <br /> 2-inch I.D. modified Califarr;ia Sathee brass sleeveswith brass e were <br /> The soil samples retained in lactic end caps, tightly <br /> sealed with teflon, plastic <br /> in cold storage for <br /> examined, a labeled, and' kep soil log <br /> " wrapped with tape, A geologic/" <br /> transport to the chemical iri abheatcrY- during the drilling <br /> s were placed on <br /> 6 mil poly-cover <br /> for each well was kept <br /> operation. Auger cuttings laboratory analysis. <br /> plastic and covered p subsoil <br /> The boring logs <br /> containing sample intervals, <br /> penetrated and well construction details of ring <br /> conditions p Appendix C. The two (2) <br /> and MW-8 can be found in App 2-inch FVC flush- <br /> wells, MW-7 and MW-a, w )lank m and escreened sections <br /> jointed, Schedule 40, was hot water (200'F) pressure <br /> inch slot size) ' Vie casing <br /> placement into the hwithw a t2minchers. The <br /> threaded <br /> cleaned before p was cape <br /> bottom of the casing The annular space of the we?p was <br /> oint PVC cap• which were pulled <br /> flush--joint the hollow stem augers ( feet <br /> backfilled through with Lonestar #3 San Sand to <br /> two 0 (2}} foot <br /> { up in 5 foot sections) <br /> ( above the ton of the screen Section. <br /> -_ nt grout. <br /> bentonite .-sea1_wa`, placed on top of the sand and thA <br /> annular space was sealed-with._.a -cem was installed... <br /> + remaining vault, with a flush cover, surface. The <br /> watertight locking than the surrounding <br /> at least 1-inch higher <br />