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Comment 21: Non-gravity drainage options for paved surfaces under solid waste <br /> storage areas, containers, and trash compactors: Activity areas that do not have gravity <br /> wastewater service can install a pressurized system. Are either of these viable options in the <br /> River Road/Santa Clara Basin? Non-gravity drainage options for paved surfaces under <br /> <br /> Material transfer areas/loading docks: Activity areas that cannot achieve gravity wastewater <br /> service may be allowed to install a pressurized system. Is this appropriate in the River <br /> Road/Santa Clara Basin? <br /> Finding: Yes, both options are viable. Pressurized systems are only necessary when the <br /> paved surface is lower than the wastewater tie-in. Inquiry and response only. <br /> Comment 22: Soil management in section 4.8.2 of the Manual should specify minimum <br /> weight standard for temporary plastic sheeting covering stockpiles. <br /> Finding: Protecting stockpiles of contaminated soils from coming into contact with <br /> stormwater with plastic film or sheeting is a temporary requirement. Contaminated soils must be <br /> decontaminated or removed to an approved disposal site. While the contaminated soils remain, the <br /> general outcome of this requirement of this section is that applicants apply a plastic material that <br /> prevents stormwater from coming into contact with the stockpiled materials. Materials that fail to <br /> meet this requirement will be in violation of the Code and the applicant will be instructed to replace <br /> the materials with another at their own cost. No changes were made as a result of this comment. <br /> Comment 23: In regards to 4.8.2 (3)Post-Construction Surface Drainage Systems, with <br /> increased density in the River Road/Santa Clara Basin, how will a system of virtually 100% <br /> private on site infiltration systems impact the management of stormwater flows and pollutants <br /> into the East Santa Clara Waterway? <br /> Finding: As related to stormwater and Groundwater Management for Development on <br /> Land with Suspected or Known Contamination, post construction surface drainage systems have four <br /> methods of approved disposal. Both of the infiltration alternatives and the disposal into a receiving <br /> stream require the applicant to obtain authorization from the city and the Oregon Department of <br /> Environmental Quality. The Army Corps of Engineers must also authorize disposal into a receiving <br /> stream. Development applications that come into the city for review that show 100% on-site <br /> infiltration will have minimal impact on the East Santa Clara waterway. Retaining the flows on site <br /> will reduce the peak flows in the stream and pollutants will be collected and treated at the site. <br /> Inquiry and response only. <br /> I. Staff has recommended that the stormwater Management Manual be adopted as <br /> amended in response to the comments received. I concur with that recommendation and find that <br /> adoption of the stormwater Management Manual as attached hereto as Exhibit B is necessary in <br /> order to meet the requirements of Section 9.6790 of the Eugene Code, 1971. <br /> Administrative Order - 7 <br /> <br />