5.4.14 Recovery measurements after cleaning by air-lift pumpingThe final cleaning of KFM06C by air-lift pumping caused a draw-down of 35 m. Aftercompleted pumping, the recovery of the groundwater table was monitored. The results aredisplayed in the diagram of Figure 5-22. Pressure registration was proceeding during six hours,and the water-yielding capacity could be determined from the diagram. An inflow of >30 L/minat a drawdown of 35 m was estimated.Borehole HFM16 is located c. 40 m south of drill site DS6. The pumping activities in KFM06Crevealed a clear hydraulic connection between HFM16 at shallow levels (= 1 Minute STOP :05/06/30 22:59:59hour:minFigure 5-22. Recovery of groundwater table in section 0–1,000.43 m of KFM06C after stop of air-liftpumping.49
6 References/1/ <strong>SKB</strong>, 2001. Site investigations. Investigation methods and general execution programme.<strong>SKB</strong> TR-01-29, Svensk Kärnbränslehantering AB./2/ <strong>SKB</strong>, 2002. Execution programme for the initial site investigations at Forsmark.<strong>SKB</strong> P‐02‐03, Svensk Kärnbränslehantering AB./3/ <strong>SKB</strong>, 2004. Claesson L-Å, Nilsson G. Forsmark. Forsmark site investigation.Drilling of the telescopic borehole KFM05A at drilling site DS5. <strong>SKB</strong> P-04-222,Svensk Kärnbränslehantering AB./4/ <strong>SKB</strong>, 2006. Petersson J, Skogsmo G, Berglund J, von Dalwigk I, Wängnerud A,Danielsson P, Stråhle A. Site investigations at Forsmark. Boremap mapping of telescopicdrilled borehole KFM06C. <strong>SKB</strong> P-06-79, Svensk Kärnbränslehantering AB./5/ <strong>SKB</strong>, 2003. Claesson L-Å, Nilsson G. Forsmark site investigation. Drilling of the telescopicborehole KFM01A at drilling site DS1. <strong>SKB</strong> P-03-32, Svensk Kärnbränslehantering AB./6/ <strong>SKB</strong>, 2003. Nilsson A-C. Forsmark site investigation. Sampling and analyses ofgroundwater in percussion drilled boreholes and shallow monitoring wells at drillsite DS2.<strong>SKB</strong> P-03-48, Svensk Kärnbränslehantering AB./7/ <strong>SKB</strong>, 2004. Hallbeck L, Pedersen K, Kalmus A. Forsmark site investigation. Controlof microorganism content in flushing water used for drilling of KFM05A. <strong>SKB</strong> P-04-285,Svensk Kärnbränslehantering AB./8/ <strong>SKB</strong>, 2003. Pedersen K. Forsmark site investigation. Control of microorganismcontent in flushing water used for drilling of KFM06A. <strong>SKB</strong> P-05-81,Svensk Kärnbränslehantering AB.51