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<br />t. <br /> <br />I <br />I <br />! <br />i <br />l <br /> <br />, <br />, <br />i <br />. L <br /> <br />I <br />I <br /> <br />r ., <br /> <br />I <br />t. <br /> <br />Ms. Anne NOrris <br />Page 4 <br /> <br />May 14, 198& <br /> <br />We would also like to point out that the portion of the project classed as <br />light industrial may not produce a compatible waste for a leptic system <br />designed for domestic wastes. Even with domestic waste, new studies being <br />conducted are showing that quantities of toxic organic pollutants are entering <br />the ground water via on-site systems. <br /> <br />SUrface Water Impacts <br /> <br />'1'he water quality analysis with respect to Lake Itasea indicates that present <br />and future phosphorus loads and in-lake concentrations will be similar. <br />However, it is our staff's opinion that the estimates presented for Lake <br />ltasca and its watershed cannot be taken as an accurate representation of <br />either existing or future conditions. 'l'be modeling approach, export <br />coefficients and aS6\llllPtions conceming..the .existing and future hydraulic <br />loads appear to have been arrived at with litUe or no regard to their 8 <br />applicability to the specific case at band. For elClSqlle, in an existing sandy <br />or marshy watershed, the use of -book- values as export coefficients is . <br />inappropriate. Similarly, the assumption that the hydraulic load, before and <br />after, will not change is questionable. '1'he existing watershed has virtually <br />no channelized flow and numerous natural retention basins. After full <br />developDent, the watershed will have a.significant impervious area with some <br />channelized and culverted runoff. It i'& suggested that the final EIS be <br />. revised to focus on a discussion of what is known about Lake ltasca and <br />describe in greater detail the mitigative aspects of the construction and <br />post-construction drainage plans which will act to reduce the hydraulic and <br />nutrient loads to the lake. <br /> <br />'!bank you for the opportunity to review the draft EIS. Should you have any <br />questions, please contact Marlene Voita of the Office of Planning and Review <br />at 612;296-7796. <br /> <br />Sincerely, <br /> <br />~ <br /> <br /> <br />cc: Mr. Gregg Downing, Environmental Quality Board <br />Ms. susanne Pelly, Air Quality Division <br />Mr. Larry Zdon, Technical Review Section, Water Quali ty Division <br />JoIr. Craig Affeldt, office of Planning and Review <br />Ms. Sharon Decker, Northfork, Inc. <br />Ms. Jorja DuFresne, Monitoring & Analysis Section, Water Quality Division <br />Ms. Anne Jackson, Monitoring & Analysis Section, water Quality Division <br /> <br />-75- <br /> <br />~ <br />