New Haven Wastewater Collection Improvements and PS5 Replacement
CM Archer Group, P.C. was retained by the City of New Haven to engineer the Wastewater Collection Improvements and Pump Station 5 Replacement Project.
The contribution area for Proposed Lift Station No. 5 is currently comprised of approximately 381 acres of undeveloped land located to the northwest of the lift station and 235-acres of existing development located to the northeast of the lift station. The undeveloped land predominantly consists of cultivated land used for various row crops. The existing development consists of mixture of commercial buildings, industrial facilities, and residential dwellings.
Currently no wastewater is generated from the undeveloped land located to the northwest of ELS5. There are no waste water collection, conveyance or treatment systems in the contribution area, other than those onsite systems utilized by the single family dwellings.
Based on data obtained from the December 2006 PER, it is estimated that the existing developed area, located to the northeast of ELS5, was estimated to produce average daily flows of 144,130 gpd. This average daily flow includes approximately 79,650 gpd conveyed by Existing Lift Station No. 7 (ELS7) to ELS5.
No wastewater collection and conveyance system currently exists in the undeveloped region of the ELS5 drainage area. However, a gravity sewer collection system does exist in the developed portion of the ELS5 drainage area and generally conveys sewage in a southwesterly direction toward the ELS5.
The ELS5 was constructed in 1968 and consists of two 20 Hp Smith & Loveless flooded suction, non-clog centrifugal pumps, mounted vertically in a dry well configuration. The lift station was designed to operate at a flow of 244-gpm and 108-feet of TDH. Based on information obtained in the December 2006 PER, the ELS5 would appear to be operating at capacity, which limits the ability of the lift station to accommodate future growth. Furthermore, the ELS5 does not have adequate emergency storage capacity to meet Missouri Department of Natural Resources requirements. Finally, ELS5 currently pumps all effluent to Existing Lift Station No. 4 (ELS4), which serves to increase the total flow pumped at ELS4 and the number of pumping cycles required to convey sewage to the city's wastewater treatment facility.