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Thankyou, for all your comments, regarding this thread. Sorry for the delay, normal busy workload commitments took over! In answer to some of the questions. Details: Surface water only, Concrete 1.5m dia pipe at 3-5m deep, 4 manholes and 70m length. Laid within dewatered sandstone bedrock...

We have a problem that we have a storm water attenuation pipe (1.5m dia) that fills with Methane everytime the barometric pressure falls, we'd like to seal the joints of the pipeline to prevent the ingress of gas. Any suggestions?? Regards, K. Parkes

We are considering the installation of an estuarial outfall across some 50m of mud flats. We are in the process of obtaining SI information for the area. We have been asked by EA to provide details of method of working (plant, trenching method, working times with tides etc). Does anybody have...