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HomeMy WebLinkAboutWPO201500043 Review Comments Minor Amendment 2015-07-31 • % S � � C. ,°�I" Dominion 172 South Pantops Drive rEngineering Charlottesville, VA 22911 'O' �/ 434.979.8121 (p) 'o9`e��� 434.979.1681 (f) e,8$ DominionEng.com July 24, 2015 Mr. Glenn Brooks, P.E. County Engineer Albemarle County Department of Community Development 401 McIntire Road Charlottesville, Virginia 22902 RE: Cascadia—Blocks 4-7(WPO 2013-00032)—Interim VSMP Plan Dear Glenn, Please find attached two copies of the Interim Plan to address your comment letter dated July 13, 2015 and as discussed at our meeting on July 23, 2015. This letter summarizes the changes. SB-2(large pond adjacent to Route 20) • The SB-2 phase lines have been removed in favor of constructing the pond all at once. • We have added the sediment trap on the Route 20 side of the embankment to the plans. This trap was approved with a VSMP Amendment for the basin to handle the outfall from the Fontana pond and roadside ditch runoff. We have also added the gravel stilling basin downstream from the sediment trap. Please note that this stilling basin was not engineered, but provides additional energy dissipation for runoff flowing to the outfall. Minor adjustments to the limits of disturbance have been made accordingly. Please note all erosion and sediment control devices will be removed following final site stabilization. • We have added a Type I turbidity curtain location and detail in lieu of the wood baffles since the wood baffle construction was complicated by a rock pond bottom. • We have indicated rip-rap below the temporary slope drain outfalls leading to the pond. SB-3(rear of site) • We have updated the plan to indicate the temporary riser and outfall pipe are to be removed following conversion of the sediment basin to a sediment trap, ST-A. • The plan continues to show the updated diversion dike location and which areas are to remain uncleared so as to limit the drainage area to ST-A. SB-4(above sediment trap next to Broadus church) • We have indicated the location of two temporary stockpiles, and added silt fence and temporary seeding notation below these stockpiles. • We have added the location of the construction road that is being used to construct SB-4 and the rip-rap outfall channel. • We have made minor updates to the limits of construction to include removal of the trap. Page 1 of 2 °oc, : `4.so Dominion 172 South Pantops Drive ® Engineering Charlottesville, VA 22911 o�1 Wer 434.979.8121 (p) + •a®�s� 434.979.1681 (f) r DominionEng.com Thanks very much for your review of the plans. If you have any questions, please feel free to give me a call to discuss. Very truly yours, ael Myers, P.E., C.F.M. Attachments Cc: Jeremy Glode Kenny Thacker Guy Wright Charlie Armstrong Charlie Hurt Page 2 of 2