0105_CobleCDLF_2ndcomment_permitapplication_FID1357873_20190910

From:Chao, Ming-tai
To:"[e-mail]"
Cc:"Kemppinen, Hannu"; Joyce, Leonard; Sugg, William P; Stanley, Sherri; Kirchner, Chuck; Aja, Deborah
Subject:Comments on the revised Permit Renewal Application, 01-05, Coble"s CDLF
Date:Tuesday, September 10, 2019 4:07:00 PM
Attachments:image003.emzimage005.pngCompliance History review Request - 0105_CDLF-1998.msgimage008.pngimage009.png
Dear Ms. Coble: The Solid Waste Section (SWS) completes a review of the engineering portions of the life-of-sitepermit application for a continued operations at Phases1, 2, & 3A and the permit to construct ofthe C&DLF – Phase 3B. The application that was received on August 29, 2019 has a FID1357327. Below are the additional comments on the application from this review, the SWShydrogeologist will conduct a review of the submitted monitoring plans, and he will send out aseparate comment letter, if any, later.
1. (Facility Plan, 3. Special Engineering Features) Please specify the thickness (6-inches) ofthe vegetative cover in consistent with Engineering Plan Drawing EP-06. 2. A LCIDLF unit (not the one ALAMA-2002-028) that is located on the west side of the scalehouse/ the C&DLF unit is shown/called out in Drawing No FP-01, Facility Plan. i. What is the status of this disposal unit? Active or closed.ii. What is the permit number of the unit? iii. If the unit is active, the existing erosion and sediment control plan (ESCP) for theC&DLF unit does not cover this LCIDLF unit. Please modify the existing ESCP permitissued by the NC Land Quality Section to include this LCIDLF unit.iv. Please provide property deed for this LCIDLF unit which is seated at the permittedlandfill property but not inside the waste footprint of the C&DLF unit. 3. (Facility Plan, Appendix 2)i. The component (18-inch-thick protective soil cover over GCL) of the proposed finalcover system of the CDLF unit that described in the Section 3 are inconsistent withthose (36-inch-thick earthen cover) in the design calculation in Appendix 2. Pleaseclarify.ii. The proposed alternative final cover system must satisfy the requirements in Rule15A NCAC 13B .0543(c)(3).iii. Using the GCL as one of components of the proposed alternative final coversystem, a mean or path inside the cover system (such as drainage geocompositematerial or drain tube) may be required to relieve excess pore water pressure builtup on interface between the GCL and protective/vegetative soil layer. Additionally,the veneer slope design is assumed the system is under a “drained” condition whichdoes not reflect the field conditions in a long-stretch raining period. Please clarify.iv. Anchor trench design for GCL should be included in Appendix 2. 4. (Engineering Plan Drawing)i. The gas vent detail & the typical final cover system shown on Drawing No. EP-06should include the proposed alternative final cover system & a gas vent penetrationthrough GCL layer as described in Section 3 of the Facility Plan.ii. The anchor trench design and typical details for CGL installation must be added tothe drawing (referring Part 3.05 of the CQA Plan). 5. (CQA Plan & Facility Plan, Appendix 2) The ASTM D 6243 shall be used to test interfacefriction angle between GCL and geosynthetic or earthen material. Please revise the testingmethod throughout the CQA & Facility Plans.
6. (CQA Plan) Please address the following concerns or provide the required info.i. Part 1.1 states that the CQA Plan is intend to supplement, but not supersede, theContract Drawings and Specifications.” However, the Specifications appended tothe CQA Plain does not include the following project related specifications – EarthWork [including the landfill base grade per Rule 15A NCAC 13B .0540(2) &(5)],Final Cover System including, but not limited to, Intermediate Soil Layer, Test Pad& Infiltration Barrier, Soil Protective Layer, Vegetative Layer and Seeding,Drainage Composite Material, Passive Landfill Gas Vent, Site Preparation andRestoration, Erosion and Sediment Control including BMPs as shown theEngineering Plan Drawings, and As-built Survey to confirm layer thickness.ii. Since the geosynthetic material (such as GCL) is proposing to be used for thelandfill final cover system, Part 1.3 should add the credential/qualification andresponsibility of a Geosynthetic Laboratory for conducting conformance testing.iii. In Part 1.3.3 the CQA Constant shall also be responsible for Quality Assurance ofthe geosynthetic material & construction at the site.iv. In Part 1.3.6 the surveyor must conduct his/her task according to Rule 15A NCAC13B .0540 (3) & (4).v. The certified CQA report shall be prepared as an individual portion of the CQAPlan and not under “Part 2 – Earth Material. Additionally, the certified CQA reportshall meet the requirements stated in Rule 15A NCAC 13B .0541.vi. Part 1.4 should add the potential agenda or requirements per Rule 15A NCAC 13B.0541(b). Additionally, a pre-construction meeting must be conducted prior tobeginning construction of the initial cell and as required by the permit.vii. Table 1 that summaries soil testing methods and frequencies for Phase 1, 2, & 3constructions has testing items & frequencies reduced from those in Table 1 of theapproved Phase 3 PTC Application dated May 2008 (DIN 4862). The changesmade to the new table are not acceptable, please use the previously approved Table1 (DIN 4862). This determination is consistent with the proposal in Section 1 of theClosure Plan dated August 2019.viii. (Part 3.0) Provide the GCL conformance testing requirements (testingitems/methods, sampling procedures, testing results, procedures to manage testfailure, etc.) which will be conducted by Coble’s to ensure the GCL products usedat the project meet the manufacturer’s product sheet. 7. Specification Section 13315 - GCL. Please add the following info.i. (Part 2.03) According to GETCO, the following MQA testing and criterium of eachtesting for Bentomat ST & Bentomat DN should be included: index flux, hydratedinternal shear strength, peel strength & tensile (grab) strength.ii. (Part 2.03) The “Standard” for fluid loss of 18 ml shall be the “maximum” amount.iii. (Part 2.03) The MQA requirements/specifications for Bentomat DN shall bespecified.iv. (Part 2.07B) Please explain why the normal stress of 250 psf is used for the GCLinterface shear strength testing. Should the normal stress selection mimic theproposed final cover system?v. (Part 3.03) Items B & C specified the requirement / criterium of the GCL subgradematerial / intermediate cover, but not testing requirements. Please add the requiredASTM testing method and testing frequency for soil grain size.vi. (Part 3.03) The written subgrade acceptance that specified in Item E shall be aportion of the CQA certification report.vii. (Part 3.09) The earthen material placed over a layer of GCL should have particlesize less than 1-inch diameter according to CETCO. 8. Specification Section 13400 appended to the CQA Plan is the specification for a differentfinal cover system from the proposed one described in Section 3 of the Facility Plan. Pleaserevise the specification accordingly. 9. (Closure Plan) Please address the following concerns or provide the required info:i. (Section 1) The erosion layer must have a minimum thickness of 18 inches per Rule15A NCAC 13B .0543.
a. Please revise the statement in Section 1.b. The cost estimates in Section 5 must be revised accordingly.c. Please remove ACM from the final cover system. ACM is an alternative covermaterial for daily or weekly cover and not applicable for the final cover system.ii. (Section 6) The CQA report for the final cover construction shall meet requirementsin the approved CQA Plan, Specifications, and Rules 15A NCAC 13B .0541 &.0543. 10. (Post-Closure Plan)i. (Section 4, Inspection Plan) Two different inspection frequencies for conducting theinspection plan are proposed – monthly and quarterly. Please provide the correctinspection frequency.
By the way, the existing permit dated February 8, 2016 (DIN 25405) expired on September
02, 2019. In addition to properly responding the above-reference comments, please complete 1.
The compliance history review form that was sent to your attention via an email on May 06,
2019. (see attachment)
2. The correct financial assurance (FA) mechanism; both the hard copy and electronic copy of FAshould be sent to Sarah Rice. If you have any questions or require any further clarification on the comment, please feel free tocontact myself. Have a wonderful day.

From: [e-mail] <[e-mail]>
Sent: Thursday, August 29, 2019 5:23 PM
To: Chao, Ming-tai <[e-mail]>
Subject: [External] 01-05 20190829 5-yr Permit renewal-LOS & RTC1

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Hannu Kemppinen has sent you files.Expires 2/25/20
A note from Hannu :
On behalf of Coble’s Sandrock C&D LF, LaBella submits to the Section responses to comments
received on May 22, 2019 and the landfill 5-year permit renewal and Life of Site application. This
application submittal includes the landfill engineering plan revised drawings and updated Plan sections
as addressed in the comment letter. The Section hydrogeologist reviewed the water quality and landfill
gas monitoring plans, and the revised plans are included in this submittal.
If you have questions or require further clarification, we are available to help and please feel free to
contact us.
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