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<br />The 30 acres of impervious surface of the proposed development are expected to increase <br />the quantity of suspended solids, metals, and organic compounds in the runoff. Nutrient <br />contributions of the site may decrease, because of the decrease in lawn area. <br /> <br />Methods-Treatment of stormwater runoff from the site will be accomplished by means of a <br />two-cell pond system. The first of the two cells will remove grit and large sediment <br />particles from the runoff. The second (created wetland) cell will provide an opportunity for <br />the smaller particles, and many of the attached pollutants, to be removed from the <br />stormwater. Routing the outflow from the second pond through the adjacent wetland area <br />will further treat the runoff before it is discharged to the City of Roseville's storm sewer <br />system. <br /> <br />b. Identify the route(s) and receiving water bodies for runoff from the site. <br />Estimate the impact of the runoff on the quality of the receiving waters. (If the <br />runoff may affect a lake consult "EAW Guidelines" about whether a nutrient <br />budget analysis is needed.) <br /> <br />The water from all roof drains and from all road and parking lot catch basins will be <br />directed to a storm sewer system that will drain to the treatment pond system being <br />constructed as part of the project. The overflow from the treatment ponds will flow to an <br />existing City of Roseville storm sewer system on the north side of the Highway 36 frontage <br />road. That storm sewer drains to a pond (Fulham Pond), which drains to a ditch that runs <br />north to New Brighton and eventually to Rice Creek. <br /> <br />The water quality of the runoff from the proposed development is discussed in part 18a., <br />above. The treatment pond system will be designed in accordance with the guidelines of <br />the National Urban Runoff Program (NURP), and can be expected to remove the majority <br />of the suspended sediments and nutrients. Because the site presently has no water <br />treatment facilities, the proposed development may actually improve the quality of the site <br />runoff, and therefore have no detrimental effect on the receiving waters. <br /> <br />19. Water Quality-Wastewaters <br />a. Describe sources, quantities, and composition (except for normal domestic <br />sewage) of all sanitary and industrial wastewaters produced or treated at the <br />site. <br /> <br />The precise nature of the wastewaters to be produced at the site will not be known until <br />the specific tenants of the office/manufacturing space are identified. However, commercial <br />space of this nature does not typically produce wastewater of an unusual nature, or <br />wastewater requiring pretreatment facilities. <br /> <br />b., Describe any waste treatment methods to be used and give estimates of <br />composition after treatment, or if the project involves on-site sewage systems, <br />discuss the suitability of the site conditions for such systems. Identify receiving <br />waters (including ground water) and estimate the impact of the discharge on the <br />quality of the receiving waters. (If the discharge may affect a lake consult ''EAW <br />Guidelines" about whether a nutrient budget analysis is needed.) <br /> <br />No sanitary wastewater treatment (pretreatment) facilities are planned for the site. <br /> <br />23624EiB \48185-1Il'MN <br /> <br />9 <br />