20110894 Ver 1_Staff Comments_20111031

1

Lucas, Annette
From: Lucas, Annette
Sent: Monday, October 31, 2011 10:07 AM
To: Chapman, Amy
Cc: Lucas, Annette
Subject: RE: 11-0894 C & D Landfill, Wake County Major Variance Request
Attachments: 11-0894 C & D Landfill, Wake County Major Variance Request.docx
BD,
I revised bullet 1 to be more specific per our discussion.
Thanks,
Z
From: Lucas, Annette
Sent: Wednesday, October 26, 201111:41 AM
To: Chapman, Amy
Cc: Lucas, Annette
Subject: 11-0894 C & D Landfill, Wake County Major Variance Request
BD,
Bullets attached. I chatted with Phil May this morning about these items and he was in agreement with me. He may
wish to set up a meeting between us, him and the engineering consultant David Harris to discuss - he will contact us if
that is the case.
Thanks,
Z
Annette M. Lucas, PE
Environmental Engineer
NCDENR I DWQ I Wetlands and Stormwater Branch
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mail)
512 N. Salisbury St, Raleigh, NC 27604 1 9cn Floor (Location & Parcels)
Phone: [phone] Fax: [phone] Email: ?1?uut?c I,ucas??,?u:denr. o;_
Website: http://Portal.ncdenr.org/web/wq/swp/ws/401
`-. Before printing this email, please consider your budget and the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
1
11-0894 C & D Landfill, Wake County Major Variance Request REVISED
AML comments
October 31, 2011
Please provide a cross-section of the landfill that shows the depth of excavation and the level of
the Seasonal High Water Table (based on a soils report by an appropriate professional, which
should also be included). Please provide engineering plans and details of the devices that will be
used to prevent leachate from infiltrating into either the ground or the pipe that will be conveying
the stream flow.
2. Please provide temporary stormwater management measures at every proposed discharge
point that are adequate to detain the 1.5 inch storm for a period of 5 to seven days and to
detain the 25-year, 24-hour storm without overtopping the emergency spillway. Please be
certain that each of the proposed temporary BMPs can be easily accessed for construction and
maintenance.
Each of the three proposed discharge points must be equipped with a stormwater BMP that
removes a minimum of 85% TSS, 30% Total Nitrogen and 30% Total Phosphorus after the
landfill is closed. Please provide a BMP Supplement Form for each proposed best management
practice (including both worksheets, Design Summary and Required Items Checklist), as well as
all of the required items. The BMP Supplement Forms are available on the DWQ web site at:
http://portal.ncdenr.org/,,veb/wq/ws/su/bmp-manual. Please be certain that each of the proposed
permanent BMPs can be easily accessed for construction and maintenance.
Lucas, Annette
From: Lucas, Annette
Sent: Wednesday, October 26, 2011 11:41 AM
To: Chapman, Amy
Cc: Lucas, Annette
Subject: 11-0894 C & D Landfill, Wake County Major Variance Request
Attachments: 11-0894 C & D Landfill, Wake County Major Variance Request.docx
BD,
Bullets attached. I chatted with Phil May this morning about these items and he was in agreement with me. He may
wish to set up a meeting between us, him and the engineering consultant David Harris to discuss - he will contact us if
that is the case.
Thanks,
Annette M. Lucas, PE
Environmental Engineer
NCDENR DWQ Wetlands and Stormwater Branch
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mail)
512 N. Salisbury St, Raleigh, NC 27604 1 9th Floor (Loration &; Parcels)
Phone: [phone] Fax: [phone] Email: Annet.te.Luca .,4 iu (,iet,r %r
Website: http://portal.ncdenr.org/web/wq/swp/ws/401
hA. Before printing this email, please consider your budget and the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to
third parties.
11-0894 C & D Landfill, Wake County Major Variance Request
AML comments
October 26, 2011
1. Please describe in detail the measures that will be used to protect the groundwater from the
landfill leachate. Please provide engineering plans and details of the devices that will be used for
this purpose.
Please provide temporary stormwater management measures at every proposed discharge
point that are adequate to detain the 1.5 inch storm for a period of 5 to seven days and to
detain the 25-year, 24-hour storm without overtopping the emergency spillway. Please be
certain that each of the proposed temporary BMPs can be easily accessed for construction and
maintenance.
Each of the three proposed discharge points must be equipped with a stormwater BMP that
removes a minimum of 85% TSS, 30% Total Nitrogen and 30% Total Phosphorus after the
landfill is closed. Please provide a BMP Supplement Form for each proposed best management
practice (including both worksheets, Design Summary and Required Items Checklist), as well as
all of the required items. The BMP Supplement Forms are available on the DWQ web site at:
http://portal.ncdenr.org/web/wq/ws/su/bmp-manual. Please be certain that each of the proposed
permanent BMPs can be easily accessed for construction and maintenance.