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5 <br />Steam lines will be excavated to standard industry practices.. This means <br />. in Minnesota about 6 feet deep (below frost line). After the installs- <br />- tion of the steam lines, the excavation will be refilled and excess dirt <br />disposed of if need be. Regrading, if required, will be done around the <br />building, roadways and steamlines. <br />20. .Will the pro~eet require an appropriation of ground or surface waters? <br />_ No X Yes <br />An 80 percent steam condensate return rate has been assumed. Peak demand <br />for make-up water is 22 gallons per minute; average demand is estimated <br />at 12.5 gallons per minute. New Brighton's municipal system is one poten- <br />tial water supply source. There is also a developed high capacity well <br />on the 33-acre site. It is a 12-inch diameter well, 356 feet deep, <br />drawing from the Jordan aquifer. <br />21. Will the project affect: <br />a) Surface water quality (on or off the site)? No X Yes <br />b) Groundwater quality (on or off the site)? X No Yes <br />c) Groundwater levels in any wells (on or off <br />the site)? X No Yes. <br />Temporary degradation of surface .water will result from site excavation <br />and access road construction. Impacts should be controllable using <br />standard construction practices. Stormwater detention ponds are a part <br />of the site design and will provide long-term surface water management. <br />• 22. What type of waste water treatment will be used? X Municipal <br />On-site Other <br />Describe the type of treatment system and amount treated in gallons/ <br />day. Indicate if pre-treatement measures will be used. <br />The muncipal sewer system will be extended to serve the plant. Most <br />wastes will be normal sanitary sewage. Daily volumes will be approxi- <br />mately 300 gallons. System capacity is more than adequate. No pretreat- <br />ment of wastewater is proposed. <br />23. Describe and.indieate on a site map the provisions to control stormwater <br />runoff. Include size and location of any retention basins and discharge <br />points. <br />Figure 8 shows proposed drainage following construction. The plan has <br />been given tentative approval by the Rice Creek Watershed District. A <br />retention pond on-iste will provide 2.2 acre-feet of runoff storage and <br />control maximum discharge to 21 efs. Surface water will ultimately <br />discharge to marshland adjacent to Rush Lake. <br />24. Will the project generate: <br />a) Air pollution? _ No X Yes <br />b) Dust? No X Yes <br />• c) Noise? No X Yes <br />d) Odors? X No Yes <br />