Anders Monsted ST/CV document number: Oil in the reject water from SPS No Precautions to avoid oil pollution.  Avoid pollution with existing set-up. Assure that waste water at all times are rejected into the open raw water circuit.  Avoid pollution with the future closed water circuit for SPS. Oil separation of waste water before rejected into the raw water circuit.

Anders Monsted ST/CV document number: Oil in the reject water from SPS The oil is coming from.  Infiltration water of the SPS tunnel. In BA3, -4 and -5 there are small concentrations of natural oil.  Oil spills from servicing and replacement of equipment.  Oil leaks from machinery greased with oil.

Anders Monsted ST/CV document number: Oil in the reject water from SPS Future closed raw water circuit.  Filtration of the waste water from the tunnel which are pumped in to the raw water circuit at SPS.  Filtration of the water is done whit an oil absorbing filter.  The oil concentration is kept to a minimum as long as the filter is renewed.

Anders Monsted ST/CV document number: Oil in the reject water from SPS Action taken. 1.Install system for test in BA3. Going on. At BA3 preliminary measurements gives a concentration < 1.5 mg / l. 1.5 mg/l will give oil traces if water if rejected into a river. Max allowed value 10 mg/l by legislation 2.Take samples to be analysed once per months of waste water for all BA’s trough 1 year. Going on Final Decision to be taken in June 2000 before the closing of the water circuit for SPS.

Anders Monsted ST/CV document number: Oil in the reject water from SPS Budget and advantages.  Investment: 8000 CHF for each BA.  Total estimated operating cost: 9000 CHF / year Depending on the oil concentration and number of filter elements needed.  Rejecting water into the raw water circuit.  Only a very small supervision / measurement system necessary.

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