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(e) Inspection followed by laboratory tests on the effluent in a surface water sewer discharging
into the Grand Union Canal in the Hayes area showed it to be polluted with
oil and to have a high biological oxygen demand. The oil pollution was much reduced
after a petrol interceptor at a factory had been improved. The high biological oxygen
demand was caused by washing water from another factory discharging into the surface
water sewers. This has been discontinued and now discharges into the foul sewer.
Maple Cross Sewage Disposal Works
Samples of effluent from the Maple Cross Sewage Works have all been satisfactory. Results
of the examination of these samples are set out below.