Biofiltration 1 pre construction measurements Biofiltration 2 pre construction measurements Biofiltration 3 trench construction w/ excavator Biofiltration Basin 4 laying geofabric Biofiltration Basin 5 wideshot excavation Biofiltration Basin 6 jute matting & geofabric Biofiltration Basin 7 jute matting & rock lining Biofiltration Basin 8 6 months after