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Ideas for desic,�n of source controls and stormwater treatment facilities: <br /> • Prevent infiltration into the fill in the northeast parking lot. <br /> • Red�ce phosphorus frcm landscaped areas (provide an enforceable plan that <br /> prohibits the use of phosphorus containing fertiiizers). <br /> = Utilize h+ah-efficiency vacuum sweepers to remove street dust from parking lots. <br /> • Utilize stormwater systems with phosphorus-removing media in series with the <br /> wetpond/swale/sand filter. <br /> • Chemical treatr� �nt (alum) of stormwater in underground wetvaults to <br /> precipitate phos�. iorus. <br /> In summary, any proposal for additional development of the Costco site 4vith a service <br /> station must include a conceptual wetland mitigation plan including performance goals <br /> identified above, and storm drair�age and water quality analysis with sufficient <br /> information indicating that phosphorous loading leaving the site (after the additional <br /> site development) will meet or exceed the phosphorous removal and water quality <br /> performance standards established i� the EIS and Costco facility approval. These <br /> conceptual plans must be sufficient to demonstrate that the criteria set forth in EMC <br /> 19.37.110.8.5.c will be met. <br /> Plezse note that this letter addresses only the water quality and wetland issues you <br /> asked the City to respond to. Other applicable City codes and requirements must alsn <br /> be addressed. If you have any questions or need further direction regarding this letter, <br /> please let me know. <br /> Sincerely, � <br /> � i <br /> /�� � <br /> /c��� �:� � - i <br /> Robert A. Landles, Manayer i <br /> Land Use Planning ; <br /> Cc: Larry Crawford � <br /> Paul Roberts � <br /> <11ian Giffen <br /> Liz Greenhagen <br /> Dave Tyler <br /> Gordon Witcher <br /> Jane Zimmerman <br /> 6 <br />