Laserfiche WebLink
<br />Comprehensive Sanitary Sewer Plan <br />City of Arden Hills, MN <br />WSB Project No. 3455-20 Page 12 <br />SANITARY SEWER TRUNK RECOMMENDATIONS <br />The proposed future sewer system for the City of Arden Hills, including gravity mains, <br />forcemains, and lift stations, is shown in Figure 5, as follows. The required infrastructure <br />additions were determined based on the areas that the City is planning to redevelop by 2040. <br />This report includes only oversized sewer lines (greater than 8-inch) and does not depict lateral <br />lines. The design and siting for lateral lines should be completed in conjunction with <br />development plans and platting. The location of such lines will be dependent on parcel layout <br />and the design of new roads. It is possible that small scale lift stations will be required within <br />developments. <br />The exact alignment of the proposed mains and lift stations may change during the design <br />phase of each project. The purpose of this report is to provide the City with a document that can <br />be used to plan for large infrastructure additions and replacements. <br />Lift Station Analysis <br />The estimated 2040 peak flows and subsequent remaining capacity for each of the City’s <br />fourteen (14) lift stations are shown in Table 7. The peak flows listed include the pumping rates <br />of any lift stations directly upstream in order to be conservative. All lift stations are projected to <br />have adequate pumping capacity to convey peak wastewater flows through the year 2040. <br />Table 7. Projected 2040 Peak Flows by Lift Station <br />Lift Station Pumping Capacity <br />(gpm) <br />2040 Peak Flow <br />(gpm) <br />Remaining Capacity <br />(gpm) <br />LS 1 240 28 212 <br />LS 2 970 647 323 <br />LS 3 240 52 188 <br />LS 4 240 218 22 <br />LS 5 660 473 187 <br />LS 6 80 3 77 <br />LS 7 220 86 134 <br />LS 8 1,170 1,050 120 <br />LS 9 280 81 199 <br />LS 10 80 21 59 <br />LS 11 350 204 146 <br />LS 12 120 33 87 <br />LS 13 460 87 373 <br />LS 14 180 16 164 <br />LS 15 * 1,010 * <br />gpm = gallons per minute <br />*Future lift station to serve the TCAAP development south of County Road H. The <br />2040 peak flow projected in this report is less than that listed in the TCAAP Site <br />Redevelopment Infrastructure Preliminary Design Report from June 2015 because <br />a lower flow per SAC unit of 180 gallons per day was used.