Illicit Discharge Detection Program
New Britain, Connecticut
BETA performed an illicit discharge detection program within a pilot area in New Britain. The first step was a review of the pilot area and dividing the pilot area into seven subareas. Then, a preliminary physical inspection of manholes was performed. Physical evidence or a sewage odor was discovered in over half of the manholes inspected. Dry weather water quality sampling was performed in the manholes by placing sandbags in the manhole outlet. All samples were analyzed for copper, fluoride, fecal coliform, fecal streptococcus, ammonia nitrogen, surfactants (MBAS), and specific conductivity. A final report was prepared that included the sampling results and recommendations for additional detailed field work at six locations. The additional detailed field work included dye testing, smoke testing, and television inspection to further pinpoint the location of the illicit connections.
After the results of the preliminary investigation and dry weather water quality sampling were performed, the City of New Britain contracted with BETA to perform dye testing of over 50 sanitary sewer service laterals in the pilot area. BETA prepared and mailed notification letters, performed dye testing, reduced the data collected, and compiled it into an organized format for review. A report with recommendations was prepared. One illicit discharge into the municipal storm sewer system was detected through these efforts.
In addition, BETA performed the annual wet weather stormwater sampling of six outfalls to meet the requirements of the City of New Britain’s General Permit. The permit requires that at least two outfalls be sampled from area of primarily industrial development, commercial development, and residential development, respectively, for a total of six outfalls sampled annually. Each outfall was selected based on an evaluation that the drainage area of such outfall is representative of the overall nature of its respective land use type. The samples were obtained, analyzed, and reported according to the requirements of the General Permit.