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Home My WebLink AboutSW6131201_Response To Comments_20240625 ■■: ThE sr1ip. -am Nan GROUP CIVIL ENGINEERS • LANDSCAPE ARCHITECTS RTGDE 24 June 2024 Jim Farkus 512 N Salisbury Street, Office 640M Raleigh, NC 27604 Reference: Rooms to Go Building and Parking Expansion (#SW6131201) 901 Rooms to Go Way Dunn, NC 28334 Comments Received Date: 05/29/2024 Resubmittal Date: 06/24/2024 The Plan review comments are listed below. Our written responses are in bold font following the comments. 1. Please clarify what set of rules (either S.L. 2006-246 or the"2017 Rules")you would like the wet pond designs to reviewed under. If the pond design is not being changed from what was originally permitted under S.L. 2006-246, with only the drainage area and BUA directed to the SCMs changing, the SCMs can be reviewed for compliance under S.L. 2006-246, or, as part of the modification, you can bring the design up to current(2017) rules (NOTE: It appears as though the project is being brought up to the 2017 rules based on the provided calculations). Response: We would like the SCM design to be reviewed for compliance under S.L. 2006-246 and have provided the appropriate calculations. Several items listed as comments under the 2017 Rules have been addressed and responded to as we noted they are also applicable to S.L. 2006-246. a. If bringing the project up to the current design standards, please correct the following: i. General: 1. Please ensure that the off-site area for the SCM drainage area is accounted for at its full build-out potential. The full build-out potential can be determined by either having the property owners enter a legal agreement that limits the amount of drainage area and BUA directed from the off-site area to the SCM or by assuming that the off-site area is 100% BUA, its full build-out potential.lt is recommended to bypass off-site areas around the SCM. NOTE: The SCMs are shown to be oversized so this does not appear to have an impact on the SCM design. Response: The offsite drainage area was accounted for at 100% BUA. 2. General MDC 4— Please provide calculations showing that the inlets and outlets for the SCMs will be stable as required per the MDC based on the revised drainage area compositions. Response: The inlet and outlet protection will be field verified for compliance with the previously approved plans. Detail has been added to the plans to show what was approved. 3. Wet Pond MDC 5b— Please ensure that the bottom of the forebay near the entrance is deeper than the bottom of the forebay near the exit. Response: We did find a discrepancy between as-built survey for the forebay and the construction notes and photos from 2014. Our documentation indicates that the forebay was constructed to the adequate depth. We have noted on the plans that the forebay depths The SITE Group 1111 Oberlin Road 919-835-4787 (o) Raleigh NC 27605 1/4 919-839-2255 (f) RTGDE 24 June 2024 should be field verified and repaired to the previously approved design condition if necessary. 4. Wet Pond MDC 11 — Please provide a planting plan that meets the requirements of the MDC (The plans indicate that this information is provided on plansheet SITE 700, however this sheet is not located within our permit file). Response: We have included the planting plan from 2014 to show plantings that were provided and note that the pond plantings have been professionally maintained and inspected since 2014. The condition of existing plantings will be included with the next annual SCM report. 5. "Existing BUA" refers to BUA that existed on-site prior to the rules going into effect, not necessarily what exists on-site currently. Please revise the Application Form (Section IV, 10) and Supplement-EZ Form to correctly account for existing BUA. Please revise as needed. Response: Noted, the BUA was updated. 6. In order for a project to meet Runoff Treatment, the net increase in BUA must be captured and treated in one or more primary SCMs. Per the provided drainage area map, there is 0.53 acres of uncaptured BUA(within drainage area A3) proposed. Please revise as needed. NOTE: If it is not practicable to capture and treat the net increase in BUA for this project, the uncaptured areas can be permitted as a low-density area in accordance with 15A NCAC 02H .1003(1)(d). Response: We have revised the plan to indicate that the construction road to the back of the site is temporary, that gravel should be removed and revegetated at the end of construction operations. All BUA will be captured and treated. ii. Southeast Pond: 1. Wet Pond MDC 7— Per the provided calculations, the drawdown time is shown as 0.67 days (0.67 days < 2 days). Response: we have specified modifications to the outlet control structure to increase the drawdown time as required. iii. Southwest Pond: 1. Wet Pond MDC 5a—As designed, the forebay is not within 15%-20% of the main pool volume (Main Pool Volume = 292,708 cf, Forebay Volume = 61,175 cf, 61,175 cf/292,708 cf= 20.9% > 20%). Response: As noted above, forebay depths will be field verified that they meet the previously approved design criteria. It has been noted that any deviation from the original design will be repaired as part of this project. 2. Wet Pond MDC 7— Per the provided calculations, the drawdown time is shown as 0.78 days (0.78 days < 2 days). Response: We have specified modifications to the outlet control structure to increase the drawdown time as required. The SITE Group 1111 Oberlin Road 919-835-4787 (o) Raleigh NC 27605 2/4 919-839-2255 (f) RTGDE 24 June 2024 3. Please provide the stage-storage table for this SCM. The provided calculations have two copies of the stage-storage table for the Southeast Pond and do not include one for this SCM. Response: Stage storage for both SCMs were included in the manual. b. If you would like the SCM design to be reviewed for compliance under S.L. 2006-246, please provide calculations demonstrating that the project will meet those rules. Response: We would like the SCM design to be reviewed for compliance under S.L. 2006-246 and have provided the appropriate calculations. 2. Please correct the following issues with the Supplement-EZ Form (in addition to any items that need to be revised per earlier comments): a. Drainage Areas Page: i. Please complete the entire site column. The entire site column is an accounting of the entire project area (similar to how the drainage area columns are an accounting of the areas draining to the SCMs). NOTE: The entire site column is not necessarily a sum of the other columns (for example, BUA that is located on-site but not draining to an SCM would be included in the entire site column but not in an SCM drainage area column). NOTE: There are generally no off-site components to the entire site column (since off-site areas are not located within the project area). Response: Entire site column has been filled out. ii. Line 18— Please revise. These values should correspond to those shown in Section IV, 10 of the Application and should reflect the percent BUA of the area draining to the SCM. Response: We have ensured the application and the supplement match. b. Wet Pond Page: i. SCM 2, Line 40— Per the calculations, this value is shown as 0.67 days (0.86 days is shown). Please also see earlier comment with regard to drawdown time. Response: The appropriate calculations per S.L. 2006-246 have been provided with this submittal. 3. Please provide a copy of the recorded easements for the stormwater collection and treatment system. This item is required per permitting condition 1.3. of Permit No. SW6131201. Response: Easements were not recorded when the ponds were originally built. We are proposing SCM access and maintenance easements on the revised plans, which will be recorded upon approval. 4. Please provide a Response to Comments letter indicating, in a point-by-point manner, how each of the above comments has been addressed. This item is required per 15A NCAC 02H .1042(3)(b). Response: A comment response letter has been provided with our submittal. 5. Provide PDFs of all revisions, 2 hardcopies of revised plan sheets, 1 hardcopy of other documents, and a response to comments letter briefly describing how the comments have been addressed. a. PDFs must be uploaded using the form at: https://edocs.deq.nc.gov/Forms/SW- Supplemental-Upload b. Hard copies must be mailed or delivered to the following address: The SITE Group 1111 Oberlin Road 919-835-4787 (o) Raleigh NC 27605 3/4 919-839-2255 (f) RTGDE 24 June 2024 i. For FedEx/UPS: Jim Farkas 512 N. Salisbury Street, Office 640M Raleigh, NC 27604 ii. For USPS: Jim Farkas 1612 Mail Service Center Raleigh, NC 27699-1612 iii. Hand Delivery: Please reach out to me prior to hand delivering a submission to make sure that I (or someone else in my group)will be able to receive the submission. Do not leave the package in the foyer with the security guard. NOTE: Hard copies should not be sent to a Regional Office. Doing so will delay the review process and the submission package may be lost while being sent from the Regional Office to me in the Central Office. Response: PDFs have been uploaded using the appropriate form and 2 hard copies are being hand delivered to your group. Please feel free to call me at(919) 744-9449 or email at bdm@thesitegroup.net if you would like to discuss any aspect of this project. Sincerely, Brandon Moore The Site Group, PLLC The SITE Group 1111 Oberlin Road 919-835-4787 (o) Raleigh NC 27605 4/4 919-839-2255 (f)