2011-09-22_Minutes - Laserfiche WebLink

Home

203 Ayes: 5 Nays: 0 Motion carried. 204 205 BMP Cost -share Request at 1356 Sextant Avenue W, Roseville, for Pervious Pavement 206 Mr. Petersen summarized the memorandum from Ryan Johnson of the Ramsey Conservation District 207 (RCD), dated September 19, 2011, related to the Stanley Cost Share Application/Contract for pervious 208 driveway materials at 1356 Sextant Avenue W in Roseville, MN, to reduce storm water and improve 209 water quality within the GLWMO. 210 211 Motion 11 -09 -05 212 Member Miller moved, and Member Westerberg seconded approval of accepting the request for cost 213 share for a partial pervious concrete driveway at a reimbursement cost not to exceed $1,000 or 50% of the 214 eligible project cost, whoever is less; with a maintenance term of ten (10) years, as recommended by Mr. 215 Johnson. 216 217 Member Miller sought clarification on who was responsible for maintenance, noting that pervious 218 driveways needed periodic cleaning to remain effective storm water management tools. 219 220 Mr. Petersen advised that, typically, the recipient of cost -share reimbursements from the GLWMO were 221 responsible for maintenance within a five (5) year life span for the BMP when state funding wasn't 222 included. Mr. Petersen opined that, from his perspective, that didn't seem to be a very long maintenance 223 period in this case, since maintenance requirements would be different and needed for a longer term, 224 through use of a vacuum device. Mr. Petersen advised, given the lack of familiarity of the GLWMO 225 Board on proven maintenance techniques for this type of application, he was concerned with moving into 226 this arena. 227 228 Member Barrett advised that it was his understanding that the proposed porous material will be pervious - 229 pavers; and questioned what guarantees the Board would have for the effectiveness of this application; 230 and if the pavers became clogged they would create storm water runoff similar to any other impervious 231 driveway application. 232 233 Chair Eckman advised that her concern was what happened to the runoff at the end of the driveway 234 during heavy rainfall events; and if the driveway had a steep slope it wouldn't soak in, but run off. 235 However, Ms. Eckman noted that Mr. Johnson had indicated that, within Ramsey County, other 236 watershed districts and WMOs do provide cost -share on porous driveways because of volume reduction 237 benefits. 238 239 Mr. Petersen suggested that the Board could approve the BMP cost -share request conditionally based on 240 the maintenance aspect; and further suggested that the Board may wish to approve this request as a pilot 241 project in order that there would be no expectation that this became a permanent part of the GLWMO 242 Board's BMP portfolio if found to be ineffective in the future. 243 244 Mr. Petersen advised that he had initially met on -site with the applicant, Ms. Stanley, and then had 245 referred her to the RCD for their input and recommendations. Mr. Petersen noted that Ms. Stanley had 246 originally been considering a rain garden to intercept water coming down the driveway and onto the 247 Hamlin Ave. system. However, Mr. Petersen advised that the existing driveway had been found to be 248 problematic due to a host of problems; and he was unsure if this solution was mutually- agreed upon by 249 the RCD and Ms. Stanley or seen as a more effective solution than a rain garden. However, Mr. Petersen 250 noted that Mr. Johnson of the RCD was apparently staking his professional judgment on the effective 251 implementation of this practice. 252 5