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Foul Air Rehabilitation Project
Description of Nature and Purpose of ProjectThe foul air line conveys odorous air from the bar screen building to the biofilter at the Dublin San Ramon Services District Regional Wastewater Treatment Facility (RWTF). When the wastewater arrives at the RWTF, the bar screens (steel bars with quarter-inch gaps) filter out inorganic objects such as pieces of wood, metal, and rags. At the next stage in the process, the grit tanks remove gravel from the process. In both cases, the foul air is sent through a 42-inch-diameter pipe and pushed through biofilter beds (dirt), removing odor from the air.
Existing ConditionsThe current foul air line is constructed of corrugated plastic line pipeline, and the joints have weakened. The foul air line was installed in 2001 during the RWTF’s Stage 4 improvements, and this 18-year old pipe has deteriorated beyond repair (see photo on right).
The foul air has been leaking through the existing pavement and Holding Basin No. 2 causing cracking and base failure in the pavement. The foul air line is located under the roadway that provides access for chemical deliveries to the RWTF. Due to the critical location, trench plates have been placed to protect the failed area and maintain vehicle access (see photo below).
Project ConstructionThe Foul Air Line Rehabilitation Project (CIP 15-P018) will remove and replace 405 feet of the failed 42-inch corrugated plastic pipeline with new 42-inch fiberglass reinforced pipe, 210 feet of 24-inch diameter pipe (70 feet for each of the three smaller laterals), and 2,350 feet of even smaller pipes (10-inch diameter, perforated pipes) which disperse the foul air through the three biofilter beds located along Hwy. I-680, preventing any further pavement damage, providing more efficient treatment through the biofilter, and decreasing foul air escaping into the atmosphere that is sometimes noticed by pedestrians on the nearby Centennial Trail.
The foul air coming from the bar screens and grit tanks will not be scrubbed while under construction for about a month. Notification post cards to our neighbors will be sent out in advance of breaking ground. Once construction is completed, we will be able to reduce future odors from our bar screens and grit tanks.
The Certificate of Determination of Exemption/Exclusion From Environmental Review was filed on March 25, 2019.
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