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Elk River Station EAW <br /> <br />September 6, 2002 <br /> <br />18. Water Quality: Wastewaters <br /> <br />a) Describe sources, composition and qt.tantities of all sanitmn; muntcipal and indttstria] wastewater <br /> produced or treated at the site. <br /> <br />Only normal domestic sewage wastewater production is expected. The types of wastewater <br />produced will be typical of mixed-use developments. No on-site municipal or industrial <br />wastewater treatment is anticipated. <br /> <br />Sanitary wastewater production was estimated based on the methods outlined in the Service <br />Availability Charge (SAC) Procedures Manual (Metropolitan Council Environmental Services, <br />2000). One SAC unit is defined as 274 gallons of maximum potential daily wastewater flow <br />volume. The volume of wastewater production for multi-family housing was calculated using one <br />SAC unit per dwelling unit. The volume of wastewater production for <br />commercial/retail/institutional development was estimated by assigning one SAC unit per 2,400 <br />square feet of total floor area. Based on these methods, the proposed Elk River Station <br />development is expected to generate a maximum of 127,136 gallons of wastewater per day as <br />shown in the following table. <br /> <br />Table 18.1. Wastewater Production <br /> <br />I SAC Gallons/Day Wastewater <br />Proposed Use SAC Rate Units Units SAC Unit (gallons/day) <br />Multi-Family Residential I 1:Unit 430 430 274 117,820 <br />CommercialI 1:2,400 s.f. 81,000 s.f 34 274 9,316 <br /> Total 127,136 <br /> <br />~) <br /> <br />The types of wastewater produced will be typical of residential and commercial/retail <br />developments, and the project.will not entail wet industrial processes. <br /> <br />Describe wrtste treatment methods or pollution prevention efforts and give estimates of composition after <br />treatment, ldentij5/' receiving waters, including major downstream water bodies, and estimate the <br />discharge impact on the q'uali~.' of receiving waters, lf the project involves on-site sewage systems, discuss <br />the suitability of site conditions for such systems. " <br /> <br />All wastewater from the Elk River Station development will be routed through a series of lateral <br />and trunk sanitary sewer pipes.. The later sewer pipes will be 8 inches in diameter, and be <br />located at appropriate depths below ground. The lateral sewer pipes will connect to an existing 8- <br />inch sanitary sewer main in Tyler Street before reaching the Elk River Wastewater Treatment <br />Plant (WWTP). The project will not include on-site sewage treatment systems. <br /> <br />If wastes will be discharged into a publicly owned treatment facility, identi~, the facility, describe any <br />pretreatment provisions and discuss the facility's ability to handle the volume and composition of wastes, <br />identijSying any improvements necessary. <br /> <br />The Elk River WWTP is located in Elk River on the Mississippi River and serves the City of Elk <br />River. The plant was upgraded during 1995 to 1996. The facility currently has a design capacity <br />to treat 1.6 million gallons per day of wastewater and the capability to expand to an ultimate <br />treatment capacity of 2.2 million gallons per day. The Elk River WWTP currently treats an <br />average of 1.0 million gallons per day, which is approximately 65 percent of the plant's current <br />capacity. <br /> <br />W Westwood Professional Services, Inc, Page 11 <br /> <br /> <br />