BEI is responsible for the contract operation and maintenance of the Prunetree Shopping Center wastewater treatment system and collection system including one lift station. This shopping center in Prunedale, CA has a single basin SBR (Sequencing Batch Reactor), no septic tanks are needed. Wastewater is pumped from the shopping center to the SBR and the treated effluent is then pumped to one of the two leachfields. The solid sludge byproduct from the SBR treatment process is bagged onsite and transported to a landfill as needed. The treatment plant also has to be operated for nitrogen removal. The effluent quality from the sequencing batch reactor is critical to continued performance of the leachfield disposal system. BEI operates this 20,000 gpd system under contract to the shopping center ownership and is responsible for all monitoring reports to the Regional Water Quality Control Board and preparation and updating of O&M manuals and ESRP. The plant has met all discharge requirements on a consistent basis.

BEI is responsible for the contract operation and maintenance of the Rancho Larios wastewater treatment system and collection system including four lift stations. This subdivision, near San Juan Bautista, CA has a sequencing batch reactor followed by reclamation and disposal to both a public playfield and an irrigation disposal field. The treatment plant also has to be operated for nitrogen removal. The solid sludge byproduct from the SBR treatment process is bagged onsite and transported to a landfill as needed. The effluent quality from the sequencing batch reactor is critical to continued performance of the reclamation and irrigation systems. BEI operates this 40,000 gpd system under contract to Homeowners Association and is responsible for all monitoring reports to the Regional Water Quality Control Board and preparation and updating of O&M manuals, SSMP, and ESRP. The plant has met all discharge requirements on a consistent basis.

BEI is responsible for the monitoring of the sewer collection system and operation and maintenance of the wastewater treatment plant for the City of San Juan Bautista. The current collection system includes two lift stations. The treatment plant was originally an aerated pond system followed by chlorination prior to discharge to a drainage ditch. BEI was responsible for the planning and design of improvements required to reduce the potential impacts on downstream water supplies. The improvements consisted of conversion of the ponds to one aerated pond followed by an engineered duckweed (Lemna) system, nitrification using fixed film growth media, pressure filtration, and UV disinfection. During the design process, pilot studies were conducted to confirm that UV disinfection following dual media filtration could provide adequate disinfection. UV disinfection was selected to avoid potential impacts of disinfection by-products on downstream water supplies. The project was funded by the State through the Small Community Grant Program. Later , improvements were required to meet new chronic toxicity limits. BEI was responsible for the planning and design of improvements. The improvements consisted of converting the first aerated pond to a sequencing batch reactor and the second pond to sludge storage and flow equalization of the treated effluent from the SBR. A baffle was installed in the second pond to separate the sludge storage from the equalization.

BEI is responsible for the contract operation and maintenance of the Cielo Vista Estates wastewater treatment system. This subdivision near Hollister, CA has a sequencing batch reactor followed by disposal to a leachfield. The effluent quality from the sequencing batch reactor is critical to continued performance of the disposal system. BEI operates this 100,000 gpd system under contract to San Benito County and is responsible for all monitoring reports to the Regional Water Quality Control Board and preparation and updating of O&M manuals and Emergency Spill Response Plans (ESRP) but is exempt from having to provide a Sanitary Sewer Management Plan (SSMP). The plant has consistently met all discharge requirements except salt levels due to water softener use by the homeowners.