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Home My WebLink About20191733 Ver 1_More Info Received_20200117Strickland, Bev From: Cindy Lancaster <clancaster@Ijbinc.com> Sent: Friday, January 17, 2020 2:39 PM To: Homewood, Sue Subject: [External] RE: Winston Lake Attachments: WinstonLake_PCN_narrativeupdate_Jan202O.pdf External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to report.spam@nc.gov Sue — Attached is an updated narrative that hopefully addresses your concerns. Let me know if you need additional information. Thanks, Cindy Cynthia C. Lancaster, P.E., CFM Water Resources Engineer Phone: 336-996-9974 Ext. 102 Cell: 336-681-5461 UEWELL ig 6)EWE LL - LJ9 From: Homewood, Sue <sue.homewood@ncdenr.gov> Sent: Monday, January 6, 2020 3:02 PM To: Cindy Lancaster <clancaster@ljbinc.com> Subject: Winston Lake EXTERNAL MESSAGE — TREAT LINKS/FILES WITH CARE Hi Cindy, I apologize if we already discussed any of this in a phone conversation regarding the dredging of Winston Lake. I have limited experience with hydraulic dredging, does it create much turbidity within the lake? I need to ensure that downstream water quality standards will be met during the dredging activity, including turbidity requirements. Could you please provide an overview analysis of the watershed draining to the lake, specifically if there are any industrial areas that may pose concern for pollutants to be within the lake sediments. I'm attaching the Inland Dredging Manual which is an older document but may provide you with some basic info of what we're looking for (Tier 1 analysis). You may also need to touch base with the Division of Waste Management regarding beneficial use of the dredge material and whether any sampling will be required in accordance with 15A NCAC 13B .0562. if you have any questions about that you can contact Ervin Lane at 919-707-8288 Sue Homewood Division of Water Resources, Winston Salem Regional Office Department of Environmental Quality 336 776 9693 office 336 813 1863 mobile Sue.Homewood@ncdenr.gov 450 W. Hanes Mill Rd, Suite 300 Winston Salem NC 27105 �...: x x � x.� .. 0(.. x.. ',. tv.:r t..: :......... ..r ......... ....+.' x..... w� as .,..a i. ..,.. This electronic message, the identity of any senders and recipients and the contents of any attachment are confidential and protected from disclosure. The information is intended to be used solely by the recipient(s) named. If you are not an intended recipient, be aware that any review, disclosure, copying, distribution or use of this transmission or its contents is prohibited. If you have received this transmission in error, please notify the sender immediately. Narrative for Preconstruction Notification Winston Lake Hydraulic Dredging Project The City of Winston-Salem owns and maintains Winston Lake within one of its City parks. An aquatic center was constructed in the park in 2018. Additional park improvements in the area of the lake are planned as Phase 2. New and improved replacements of the existing picnic shelter, restrooms and dock will be part of the project. As part of the improvements, the City also proposes to have accumulated sediments in upper areas of the lake removed using hydraulic dredging. The removed materials are to be pumped into geotextile tubes set up either on paved areas near the lake or, with the use of an added booster pump, to higher areas up on the City's driving range as shown on the plans. We do not expect the dredging to cause high turbidity levels in the lake since the sediments will be removed from the bottom up, using equipment somewhat like a horizontal auger rotating through the sediment, with the pump pulling materials into the tubes as it is being disturbed. Silt fence and other appropriate erosion control measures will be installed on downgradient sides of the geotextile storage areas. All drainage from the geotextile tubes will be routed back to the lake in plastic -lined swales or channels, through an existing pipe under the road and parking area, and then across an existing swale, which is also to be protected with a liner. The geotextile tubes are to be stored in place for up to 60 days to allow for sufficient drying of the materials. The geotextile tubes on the driving range will be opened and the materials re -graded to the extent necessary to re-establish satisfactory topography. Any materials stored on paved areas will need to be relocated up to the driving range and included in the re -grading effort. The volume of sediment to be removed from the lake is dependent on the contractor unit price bids and the City's project budget. A final grading plan for the driving range will be developed after the sediment quantity is better determined. Erosion control protection measures will remain in place until final grading has been done and adequate vegetative cover is established. Winston -Lake Dredging Project City of Winston-Salem �-r� Updated January 2020 tIEWELL - LI. TIER 1 ASSESSMENT INFORMATION Per request from NCDEQ in review for a Water Quality Certification for the proposed dredging, JEWELL-LJB reviewed available information about the sediments and the watershed. The following characteristics of the watershed, the sediment placement area, and the sediment composition are offered as indications that no testing is needed for the proposed project: 1. Sediment composition: Although we have not had the lake sediment specifically tested for composition, it was tested for potential consolidation so that the dredging contractor would be able to estimate the volume of dried sediment as compared to dredged sediment. Several sediment samples were removed and dried in filter bags over 4 days. The consolidation rate was only 84%, which is indicative of a surprisingly high sand content relative to what is generally observed in lakes in the piedmont. Sediment with a lot of clay will have considerably higher shrinkage rates over the four day testing period. 2. Sources of contaminants: There are no permitted wastewater discharges within the watershed. The aerial photography also does not indicate any active industrial sites within the watershed. The only stormwater NPDES permit holder in the watershed is Discount Auto Parts on New Walkertown Road. We also reviewed the NCDEQ information on hazardous sites. The only active hazardous site is the Forsyth County Schools maintenance garage along the ridge line between the Winston Lake watershed and the adjacent one. Most if not all of the underground storage tanks at this site seem to be located on the far side of the ridge outside of the Winston Lake watershed. There is one inactive hazardous waste site within the watershed at the former site of Chemcraft/Sandolin Paint Products. It is ranked 414 on the NCDEQ priority list of about 515 inactive hazardous waste sites. There are three registered underground storage tanks in the watershed, and reports of several underground or above -ground storage tank incidents scattered around the watershed. None of these sites are in close proximity to Winston Lake. Overall, most of the watershed is either single-family residential or remains undeveloped. Winston -Lake Dredging Project 2 City of Winston-Salem J r I Updated January 2020 tIEWELL - LJB 3. Discharge site: The removed sediments are to be placed on property in close proximity to the lake in an area that will drain overland back to the lake or through a short reach of stream down to the lake. Runoff and interstitial flows from the sediment placement area will be directed back into the lake, with any suspended sediments likely winding up back in the upper areas of the lake. No uses of the sediment placement area are proposed other than continued operation as a driving range for the municipal golf course. Winston -Lake Dredging Project 3 City of Winston-Salem �-r� Updated January 2020 tIEWELL - LI.