2017-02-28_PWETCPacket - Laserfiche WebLink

Home

Roseville PWET Commission Meeting Minutes Page 12, January 24, 2017 504 smaller parking lots compared to larger ones falling under watershed district rules 505 (e.g. Rosedale Center and installation of an underground gallery). Mr. Culver 506 provided another example for the Fairview Medical Center's new wing at County 507 Road C and Fairview Avenue, when just over 5,000 square feet of their parking 508 lot was disturbed, triggering in the installation of one large infiltration basin 509 510 With Chair Cihacek noting that rain gardens or hard landscapes could also be part 511 of a solution, Mr. Freihammer advised that staff was open to any design at the 512 owner's choice as long as it met the standards. At the further request of Chair 513 Cihacek, Mr. Freihammer clarified what triggered permit for new or 514 reconstruction based on square footage. However, 'hammer noted the 515 current issue is policy language in the CSWMP tha s ambiguous as to if and 516 when maintenance of an existing lot versus redo' t t triggered stormwater 517 management improvements. 518 519 Member Heimerl questioned the amo of pervious pave allowed, and 520 whether the city would ever encoura nstalla ' n through in 0or other 521 means for residences and businesses to i it i locations i riveways or 522 parking lots to prevent pollutants getting int stem. Member eimerl used a 523 personal example in his own iveway where a on needed replacement in the 524 near future, and his consider a a pervious . ation for that segment. If 525 such allowances were made th e city Me eimerl questioned the 526 overall aggregate improvement f the ter sys m, an in light of the larger 527 and larger rainfalls being experie d. ve e installation of larger catch 528 basins, Me mb 1 asked i e city Id ever resolve drainage and 529 flooding is Mem Heimerl n d that the city kept building underground 530 stormwat wit t a global ach to manage stormwater, seeking 531 whether or not a nt coul ccomplish the goal of keeping water off 532 the 533 534 r. Johnson r ded improvement for drainage would help; and noted 535 any produce of porou avements would have engineering specifications as 536 to much drainage it would address based on the rock subgrade with it, 537 essen allowin nderground storage with obvious additional costs for extra 538 excavat d ro for that base. By looking at that option, Mr. Johnson advised 539 that a lot is stormwater concerns could be addressed, and should and 540 could be don ity wide. However, Mr. Johnson advised that the problem was in 541 the inability o treat all of the runoff coming off acres and acres of parking lots, 542 driveways and other impervious surfaces citywide. Therefore, the easiest way to 543 address the problem was to contain that water on site. 544 545 Mr. Culver clarified, however, that just because pervious pavement is installed, it 546 didn't mean that all water infiltrates into the ground depending on the soil type. 547 In Roseville, Mr. Culver advised that the impact would be small due to the heavy 548 soils in the majority of the community, even though it would allow some rate 549 control and slow drainage down some. Regarding funding, Mr. Culver noted that,