HomeMy WebLinkAboutWPO201600018 Review Comments WPO VSMP 2016-04-13COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Phone (434) 296-5832 Fax (434) 972-4126
VSMP Permit plan review
Project: Castalia Pond (ESC) / Mitigation Plan
Plan preparer: Lauren Gilroy/Justin Shimp, Shimp Engineering, 201 E. Main St.
Suite M, Charlottesville, VA 22902 f iustin(&shimp-enizineering com]
Owner or rep.: Castalia-Cismont Investment LLC, 200 Garrett St., Suite S
Charlottesville, VA 22902
Plan received date: 18 Mar 2016
Date of comments: 13 Apr 2016
Reviewer: John Anderson
WP0201600018
A. Stormwater Pollution Prevention Plan (SWPPP)
The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain (1)
a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures necessary.
1. Ref. Sec. D. item #6, 7, below.
B. VSMP: SWPPP: Stormwater Management Plan (WP0201600018)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is
PENDING. The stormwater management plan content requirements can be found in County Code section 17-403.
1. Ref. Sec. D. item #6, 7, below.
C. VSMP: SWPPP: Erosion Control Plan (WP0201600018)
Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved
for reasons provided in comments below. The erosion control plan content requirements can be found in County Code
section 17-402.
Ref. Sec. D. item #3, 4, below.
D. Mitigation Plan (WP0201600018)
1. Confirm design intent to establish buffers for intermittent/perennial stream not presently shown on county
GIS layer. Albemarle County will visit site upon request, but does not ordinarily take initiative in cases
where topographic features not shown as streams in on-line GIS system may be impacted by a project
proposal. This signals no reticence to enforce ordinance, nor does it relieve Applicants of 17-600.13.
requirements:
Engineering Review Comments
Page 2 of 4
ARTICLE VI, STREAM BUFFERS
Sec. 17-600 Extent of stream buffers; retention and establishment.
Except as provided in section 17-602, each erosion and sediment control plan and each VSMP permit shall
provide for stream buffers for the purposes of retarding runoff, preventing erosion, filtering nonpoint
source pollution from runoff, moderating stream temperature, and providing for the ecological integrity of
stream corridors and networks, as provided herein:
A. Development within a development area. If the development is located within a development area,
stream buffers shall be retained if present and established where they do not exist on any lands
subject to this chapter containing perennial streams, contiguous nontidal wetlands, or both. The
stream buffer shall be no less than one hundred (100) feet wide on each side of any perennial
stream and contiguous nontidal wetlands, measured horizontally from the edge of the contiguous
nontidal wetlands, or the top of the stream bank if no wetlands exist.
B, Development within a water supply protection area or other rural land. If the development is
located within a water supply protection area or other rural land, stream buffers shall be retained if
present and established where they do not exist on any lands subject to this chapter containing
perennial or intermittent streams, contiguous nontidal wetlands, and flood plains. The stream
buffer shall extend to whichever of the following is wider: (i) one hundred (100) feet on each side
of any perennial or intermittent stream and contiguous nontidal wetlands, measured horizontally
from the edge of the contiguous nontidal wetlands, or the top of the stream bank if no wetlands
exist; or (ii) the limits of the flood plain. The stream buffer shall be no less than two hundred (200)
horizontal feet wide from the flood plain of any public water supply impoundment.
C2 —GIS shows stream buffer for stream located 275' E of Ex. Riding Ring. Area further east, shown with
buffer disturbance =61,459 sf, does not appear with stream buffer in county GIS.
2. Ref. Attached Riparian Buffers Guidance Manual, Table B/Option C.
C. Ifthe applicant is willing to enter into a five year maintenance and performance guarantee:
100% of buffer planted with:
Bare root seedlings or whips at 1,210 per acre, approximately 6'x 6' on center (Minimum
survival required after two growing seasons: 600 plants)
or
Container grown seedling tubes at 700 per acre approximately 8'x 8' on center (Minimum
survival required after two growing seasons: 490 plants)
C2 —Please include reference to five year maintenance and performance guarantee.
3. C3 —Include stream bypass design required to protect downstream stream water quality during dam
construction. Provide graphic depiction of perennial/intermittent/ephemeral stream bypass.
4. C4 —Provide narrative sequence to ensure the same (item #3). For example, one option is to place bedding
for 50 LF 30" RCP through -dam pipe, divert stream into 50' pipe, construct dam with no stream water
quality impact, then, during clear weather, use coffer/pump techniques to construct the 42" DIA RCP
standpipe. Recommend detailed stream bypass/dam construction sequence after Phase 1 sequence notes.
5. If streams or wetlands exist, acquire applicable state/federal permits or review clearances.
6. With land disturbance >10,000 ft2, project is subject to the VESCP and VSMP unless Applicant claims
exemption under 17-301.G.; 17-303.B. (Agricultural Pond). Without exemption, ESOP, VSMP Permit
Application, General VPDES Permit registration statement, and SWPPP are required.
7. 17-304.A. requires the VSMP Administrator to determine whether an activity is subject to Chapter 17. The
1.5 Ac. proposed pond appears to qualify for exemptions at 17-301.G., and 17-303.B. Albemarle County
requests Applicant provide narrative supporting exemption. Narrative should focus on agricultural purpose.
If no agricultural purpose is served, project proposal does not qualify for exemption.
8. C4 —Recommend include dam construction notes; for example:
Engineering Review Comments
Page 3 of 4
DAM 0769MnON NOTES
GEOTECHNICAL CONSULTANT TO SPECIFY DAM EMBANKMENT
MATERIAL, SEEPAGE CONTROL DEVICES, CUT—OFF TRENCH
DESGN, CULVERT EED04NG REQUIREMENTS. AND OTHER
APPROPRIATE GEOTECHNICAL DESIGN REQUIRIEMENTS.
FOUNDATION AND ABUTMENT AREA EXTENDING 10' BEYOND
DAM FOOTPRINT SHALL BE CLEARED, GRUBBED Ac STRIPPED
OF ALL VEGETA11p TOPSOIL 00/0R ORGANIC SOIL & OTHER
UNSUITABLE MATERIALLS,
AFTER CLEARING, GRUBBING. STRIPPING AND REMOVING ANY
OTHER UNSUITABLE MATERIALS, THE SUBGRADE SHALL BE
PROOFROLLEU WITH COIPACTION EOUIPMENT UNDER THE
OBSERVATION OF A QUALIFIED ENGINEER- THE COMPACTION
EQUIPMENT SHOULD BE THE HEAVIEST POSS UI -E EQUIPMENT THAT
WILL NOT CAUSE DISTURBANCE OF SUITABLE SUBGRADE SOILS,
EXCESSIVELY SOFT OR UNSUTASL E MATERIALS SKALL BE REMOVED AND
REPLACED WITH COMPACTED FILL WHERE ROCK IS EXPOSED AFTER
STRIPING OR UNDERCUTTING, ALL LOOSE ROCK MATERIAL SHALL 13E
REMOVED PRIOR TO PLACING COMPACTED FILL, R" SUBGRADES
SHALL BE INSPECTED AND APPROVED BY THE INSPECTOR OR
ENGINEER PRIOR TO PLACEMENT 4W FIH
COMPACTED FILi, SHALL NOT BE PLACED PRIOR TO PERFORMING
THE REQULRED FOUNDATION AND ABUTMENT PREPARATION, OR
ON ANY F'ROZEH SURFACE CMAPACTED FILL SHALL EXTEND TO
THE rILL LIMIT LINES AND GRAOES INDICATED BY THE APPROVED
OONSTRUCTION PLAN, COMPACTED FILL MATERIAL SHALL BE OF
THE TYPE CLASSIFICATION SYMBOL SPECIFIED BY THE GEOTECHNICAL
CONSULTANT. OR OF A BETTER OUALJTY MATERIAL AS DEEMED By
THE UNIFIED SOIL CLASSIFICATION SYSTEM, ALSO, RESTRICTIONS ON
THE LIQUID LJMITS AND PLASTLOTY INDEX OF THE MATERIAL MAY
EIE INCLUDED WHERE APPLICABLE, COMPACTM FILL SHALL CONSIST
of MATERIAL FRIG OF ORGANIC MATTER. RLIBBISH, FROZEN SOIL,
SNOW. ICE. PARTICLES WITH SIZES LARGER THAN 3" OR OTHER
DELETERIOUS MATERIAL
COMPACTED FILL SHALL BE PLACED IN HORIZONTAL LAYERS Of S'
TO 12* IN LOOSE THCCKNESS, ACTUAL LIFT THICKNESS WILL BE
SPECIFIED BY THE GEOTECHNLCAL CONSULTANT. THE= MC4STURE
CONTENT SHALL BE CONTROLLED SUCH THAT COMPACTION IS
ACHIEVED WITHOUT 11E LDING OF THE SURFACE EACH LAYER
SHALL BE UNIFORMLY COMPACTED WITH SUITABLE COMPACTION
EQUIPMENT TO AT LEAST 95X OF STANDARD PROCTOR MAXIMUM
DENSITY IN ACCORDANCE NTH AST} 0-658, AASHTO T-99, OR
VOOT SPECIFICATIONS, ANY LAYER OF FINE GRAINED FILL
WHICH BECOMES SMOOTH UNDER COMPACTION OR CONSTRUCTION
TRAFFIC SHOULD BE SCARLFIET} TO A DEPTH OF 2' TO ALLOW
ADEQUATE BONDING BETWEEN LAYERS,
COMPACTED FILL WITH A MOISTURE CONTENT WHICH WILL NOT
PERMIT COMPACTON TO THE SPECIFIED DENSITY STANDARD
SHALL BE SCARIFILO DRI»} OR WETTED AS NECESSARY TO
PERMIT PROPER COMPACTION.
Process:
(typical —this may vary depending on Applicability of VESCP/VSMP requirements to this project. —ref. item #7, above)
After approval, plans will need to be bonded. The bonding process is begun by submitting a bond estimate request
form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and
check parcel and easement information based on the approved plans. The County's Management Analyst will
prepare bond agreement forms, which will need to be completed by the owner and submitted along with cash,
certificates or sureties for the amounts specified. The agreements will need to be approved and signed by the County
Attorney and County Engineer. This may take 2-4 weeks to obtain all the correct signatures and forms.
Stormwater Management Facilities and Mitigation Plan Maintenance agreements will also need to be completed and
recorded. The County's Management Analyst or other staff will prepare the forms and check for ownership and
signature information. The completed forms will need to be submitted along with court recording fees.
After bonding and agreements are complete, county staff will need to enter project information in a DEQ database
for state application processing. DEQ will review the application information based on local VSMP authority
approval. At this time, the DEQ portion of the application fees will need to be paid directly to the state. For fastest
Engineering Review Comments
Page 4 of 4
processing, this is done electronically with the emails provided on the application. DEQ should notify applicants
with instructions on how to pay fees. When DEQ approves the application, they will issue a permit coverage letter.
This should be copied to the county.
After DEQ coverage is issued, via the coverage letter, the County can hold a pre -construction conference. Applicants
will need to request a pre -construction conference by completing a form, and pay the remainder of the application
fee. The form identifies the contractor and responsible land disturber, and the fee remaining to be paid. This will be
checked by county staff, and upon approval, a pre -construction conference will be scheduled with the County
inspector. At the pre -construction conference, should everything proceed satisfactorily, a joint VSMP and grading
permit will be issued by the County so that work may begin.
County forms can be found on the county website forms center under engineering;
http://www.albemarle.org/deptforms.asp?department--cdengwUo
Thank you.
434.296-5832 —0069
File: WP0201600018 Castalia Pond 041316