HomeMy WebLinkAbout21-23 Site Plan page 3A rev 121523EROSION AND SEDIMENT CONTROL NARRATIVE: 742_-�
Project DescriptionThis project is located on Route 626 Rest Church Road. The owner - - - - - - - - - - - - - -
p ) proposes to construct a new multi -purpose �" -�- 5' PPRKING SE eACK
and a new sanctuary building along with associated parking and other site improvements. Proposed '-� - _ _ _ - - _ p�• '. '
improvements are planned to begin during the fall of 2023.
Existing Site Conditions
The project site will be located on a 11.84 acre parcel which currently is used as a church facility.
Flood Plain
The parcel contains no floodplain. �
= � � _ � \ / 1 / \ \ _ � µ•'me _ �' 1� I
Soils7�J FITS t 1
The USGS Soils map shows the predominant soil type on the site is 14B, Frederick-Poplimento looms. This soil , 1
is generally fairly deep (25"-72"), well -drained, and residuum of limestone. The Hydrologic Soils Group is "B
See Sheet 9. __---'-
Adjacent Areas �.`- \� _IOWOF eRL
The adjacent properties are used for residential purposes.
Off -site Areas
There will be no off -site disturbance except as allowed by temporary construction easements.
Critical Areas
No critical areas where slopes are greater than 3:1 are present on site. 1'�� \ J' \\ \ \ •Qr I
The disturbed area is approximately 3.9 acres.
PHASE 1 BUILDING -PHASE 1 EROSION AND SEDIMENT CONTROL MEASURES
3.01 Where silt fence or earth berms are not resent to delineate the limits of disturbance, install orange \ \
safety fence as required to prevent unauthorized disturbance. Inspect the fencing weekly and make repairs as \\\ \\\\ \ \`\\ I J I IT "�1 II
necessary. wi /� / -- \\ \ 1
3.02 The existing asphalt parking area will serve as a construction entronce and a staging area and will be t /
be maintained in a condition which will prevent tracking or flow of mud onto the public rights -of -way. This \ \ ` \ ` `� I 1\ o
may require periodic top dressing with additional stone or the washing and reworking of existing stone as
conditions demand and repair and/or cleanout of any structures used to trap sediment. All materials spilled;`.�
dropped, washed, or tracked from vehicles onto roadways or into storm drains must be removed immediately. \ `a .� / -I \ ^. 2
The use of water trucks to remove materials dropped, washed, or tracked onto roadways will not be permitted
under any circumstances.
3.05 Silt fence will be installed in selected locations downstream from the construction areas as a first
measure of construction. Silt fence will be installed around the downstream side of any topsoil stockpiles. Silt
fence will be installed along the perimeters of the existing drainfields as required to prevent disturbance. Silt
fences shall be inspected after each rainfall and at least daily during prolonged rainfall. Any required repairs �� >
shall be made immediately. Damaged, decomposed or otherwise ineffective silt fence shall be replaced. Sediment-'`'-�, `� ^-` _ _ _-�X x X
deposits should be removed after each storm event. They must be removed when deposits reach approximately
one-half the height of the barrier. Any sediment deposits remaining in place after the silt fence is no longer \ _ ♦ T ♦- - - _ - - _ I - - /
needed shall be dressed to conform with the existing grade and stabilized.
3.14 A temporary sediment basin will be constructed on the site to control sediment generated from the earthwork •Aa \ ri %�♦ I `✓- �� -
\. '
operation. The basin berms will be constructed with on -site materials and will be seeded with the permanent seeding mix I- \
immediately after installation. This facility will be inspected after each rain storm and repairs made as necessary./ ,; 1 !
3.31 Temporary seeding in accordance with the E & S Std & Spec 3.31 will be applied to the topsoil stock F I I, 1' iC l.' �q I I \1 ♦ ( j I `\\ �.�
pile and all areas which will not be brought to final grade within 30 days. Embankment or excavated slopes ---� $g I ..I`. I 1 ,\♦ ` t \ o
denuded for a period of greater than 30 days shall be temporarily seeded and mulched. All temporary seeding
areas will be mulched in accordance with the schedule included herein.
Temporary Seeding
SEED TYPE RATE MIN. PURITY(%) MIN. GERM.(%) \\\ \ \ \
Sept 1 -Feb 15:
-----_ \\
Annual Ryegrass 50 Ib/ac 98 85
Winter Rye 50 Ib/ac 98 85
May 1 - Aug 31:^♦ ,y_ ` \ 1 I
German Millet 50 Ib/ac 98 85 4a`\� ` \ \ \ \ \ F ca�Kx'xane^as"
\ L. ♦ \ \ \ \ ixE PRISE 1 OWING NI.W AND i E 0=m 1 \
or ` \ \ \ \ \ \\ \ F WAIN ON THIS MEET. E \
UIVEIt5I0N MIDGE REQUIRED
WHERE GRADE EXCEEDS 2% 2 % OR"IM
GREATER
EXISTING PAVED
ROADWAY 1 1-1r-1 I -,'' 11 IJ
FILTER FABRIC
SECTION A - A
NOTE:
SPILLWAY USE DRAGS, STRAW BALES
SEDIMENT BARRIER OR ER APPROVED METHOD
(STRAW BALE TYPE SHOWN) TO HANNELIZE RUNOFF TO B
AS EQUIRED.
SUPPLY WATER TO WASH
WHEELS IF NECESSARY.
FT,OIT FLOW
LLI
aQ A 11 A 2'-3COURSE
AGGREGATE
00 MIN. 6' THICK `t^�a•
0
\I
Z DIVERSION RIDGE
U)
w --�
PLAN
NOTES:
1. THE ENTRANCE SHALL BE MAINTAINED IN A
CONDITION THAT WILL PREVENT TRACKING OR
FLOWING OF SEDIMENT ONTO PUBLIC RIGHTS -
OF -WAY. THIS MAY REQUIRE TOP DRESSING,
REPAIR AND/OR CLEANOUT OF ANY MEASURES
USED TO TRAP SEDIMENT.
2. WHEN NECESSARY, WHEELS SHALL BE CLEWED TEMPORARY
PRIOR TO ENTRANCE ONTO PUBLIC RIGHT-OF-WAY. GRAVEL
3. WHEN WASHING IS REQUIRED, IT SHALL BE DONE
ON AN AREA STABIUZED WITH CRUSHED STONE
THAT DRAINS INTO AN APPROVED SEDIMENT TRAP CONSTRUCTION
OR SEDIMENT BASIN. ENTRANCE/EXIT
EXTRA STRENGTH FILTER FABRIC
NEEDED WITH WIRE SUPPORT
STEEL OR In
WOOD POST
row
or_
WIRE & Fl TER FABRIC
/ TO AUPSTRECAMRELY
SIDE OF POST.
RUNOFF RUNOFF
9' uex. d
I
1>J
T i1JJ1 111(1
12" MIN. --I I,T.I,ILLIT
rl CH
WB a�CSj(nC0�1yMP
I TL'lII
12" MIN.Ill L �ITI
GRAVEL
ED
u L
J I- :;
STANDARD DETAIL
ALTERNATE DETAIL
TRENCH WITH NATIVE BACKFlLL
TRENCH WITH GRAVEL
NOTE:
4. SET POSTS AND EXCAVATE A 4"x4"
1. INSPECT AND REPAIR FENCE AFTER EACH
STORM EVENT AND REMOVE SEDIMENT WHEN
TRENCH UPSLOPE ANLONG THE UNE
OF POSTS.
NECESSARY.
5. STAPLE WIRE FENCING TO THE POSTS.
2. REMOVED SEDIMENT SHALL BE DEPOSITED
TO AN AREA THAT WILL NOT CONTRIBUTE
6. ATTACH WIRE FILTER FABRIC TO THE WIRE
FENCING AND EXTEND R INTO THE TRENCH.
SEDIMENT OFF -SITE AND CAN BE PERMANENTLY
STABILIZED.
7. BACKFILL AND COMPACT THE EXCAVATED
3. SILT FENCE SHALL BE PLACED ON SLOPE
SOIL
CONTOURS TO MAXIMIZE PONDING EFFICIENCY.
SILT FENCE DETAIL WITH WIRE SUPPORT
NOT TO SCALE ADDAPTED FROM: 1992 VA E&S CONTROL HANDBOOK 3.05
Feb 16 - Apr 30:
Annual ryegrass 75 Ib/ac 98 85
Mulch: 1.5 ton/ac small grain straw
Fertilizer: 1000 Ib/ac 10-10-10
TOP OF BERM ELEVATION-735.00
00• SPILLWAY ELEVATION®734.00
_ ADD 4' TO NEW BERM TO ALLOW PEDESTRIAN[24'C RISER
PHASE 1 BUILDING -PHASE 2 EROSION AND SEDIMENT CONTROL MEASURES ��� /` -_ ��--J l - I i I ,pF, -_ ` - J T 1 FOR SETREAENT TOP-74.0 H-10 GF
3.05 Silt fence will be maintained/installed in selected locations downstream from the construction areas and ��1 j� / �'-- �`\Y?'- '!!l•••_r-----��� 1 2" INV. our-731so
-¢�- {l ��-_ 1 - = -- ( \ 6" INV. - 31.50
the drainfields. Silt fence will be installed around the downstream side of any topsoil stockpiles. Silt fences shall
ft^�_J-- _
be inspected after each rainfall and at least daily during prolonged rainfall. Any required repairs shall be made ,J I j r ✓ �\ /
immediately. Damaged, decomposed or otherwise ineffective silt fence shall be replaced. Sediment deposits /��JJ I ( ��' ���zxr��`�` -1 / / -F
should be removed after each storm event. They must be removed when deposits reach approximately one-half I ! \A
the height of the barrier. Any sediment deposits remaining in place after the silt fence is no longer needed PH E 1 BUILDING PHASE 1 E&S PLAN7�7
shall be dressed to conform with the existing grade and stabilized.
3.30 Replacement of topsoil will generally occur throughout. the work site where vegetation is to be ---��_---_------ 742-----1 _____-_� � \
reestablished. Topsoil will be uniformly spread. and rolled to a minimum. depth of 4". Topsoil shall not be --- - - - - - _ _ - _ _ _ - _ _ _ _ _ _ _ _ _ _ --
placed
placed while in a frozen or wet condition. PARKING SETBACK - - -�-
3.32 All disturbed areas will be stabilized by permanent seeding in accordance with the schedule included -- -
herein. The anticipated time for construction is fall 2023 through fall 2024.
3.35 All seeded areas will be mulched in accordance with the schedule included herein.
Permanent Stabilization
The contractor shall stabilize all denuded land within 7 days after the end of construction. Permanent
stabilization shall be applied to areas that are to be left dormant for more than one year. During construction • ��� \
of the project, soil stockpiles shall be stabilized or protected with sediment trapping measures. The contractor ✓�� - \ i FJ I T �1 '
is responsible for the temporary protection and permanent stabilization of all soil stockpiles on site as well as
soil intentionally transported from the project site. No soil testing is required. The contractor shall establish
vegetation on all areas not otherwise stabilized according the following specification:
100' eRL _ I
Seedbed Preparation:
a. Scarify top 1" to 2" of soil after final grades have been achieved. j �1 i �a
b. Add 3 tons per acre pulverized agricultural limestone(1401b/1000sf).ng a to
�y
SEED TYPE RATE MIN. PURITY(%) MIN. GERM.(%) ` I E
Tall fescue 120 Ib/ac 97 85
Red clover 8 Ib/ac 95 65
Ladino clover 8 Ib/oc 95 65
Nurse Grass -(season dependent)
Set 1 - Feb 15:
Annual Ryegrass 12 Ib/ac 98 85
Winter Rye 12 Ib/ac 98 85 ♦\\ \\\ ` ® ® \
May 1 - Aug 31:
German Millet 12 Ib/ ac 98 85 \ r \'\ �,� \\ \\ -• I
or
Feb 16 - Apr 30: a,�/ `. \ \� ` ` ® ® /1 H.
Annual ryegrass 12 Ib/ac 98 85 � �
Mulch: 1.5 ton/ac small grain straw
Fertilizer: 1000Jb/ac 10-10-10
1. The VESCP Authority must be notified one week prior to the preconstruction conference, one week prior to
the commencement of land disturbing activity, and one week prior to the final inspection.
2. Work on the project (grading, excavation, construction shall not commence until the a p (g g, ) appropriate erosion and `� ` ``� \ 3
sediment controls are in place as specified on the plan and as approved by the VESCP Authority. _ /
3. The approved site plan must be kept on the work site and shown on request.
4. Prior to commencing land disturbing activities in areas other than indicated on these plan (including, but not
limited to, off -site borrow or waste areas), the contractor shall submit a supplementary erosion and sediment �u�; , �_ +�_ `��<<� ♦\� I I / I\\/
control plan to the VESCP Authority for review and approval.-
�h- .'
5. The contractor is responsible for installation of any additional erosion control measures necessary to prevent --- ! ��--' - - �- -- _ .- aa:s� �,�•�-. - - - I F I
erosion and sedimentation as determined by the VESCP Authority. \ -� ♦,
6. All disturbed areas are to drain to approved sediment control measures at all times during land disturbing
activities and during site development until final stabilization is achieved. � \\ � �` \.:, I I �♦ I t ___ ,� rA ,\ _
7. All vegetative stabilization shall be uniform, mature enough to survive, and adequate to inhibit erosion. 1
__4-c
PHASE 1 SEQUENCE OF CONSTRUCTION
1. Install construction entrance.
2. Install silt fence alongdownstream perimeter of work areas and around the inlet of the existing detention
pond outlet. P 9
3. Install berm and sediment basin. T- �•--• •`�� \\ I / ) \\ \\ Hm \\ \\ I ��' i ^ f, 1
4. Install safety fence along the perimeter of the existing drainfield as shown on the plans. \ --
5. Strip, stockpile and stabilize topsoil in location shown on the Site Erosion and Sediment Control Plan. Apply
temporary seeding. /
6. Perform rough grading over site. Insure that runoff from the disturbed areas is directed to the sediment �� _ ` \ ��_J�
�,- r--_ -_s \
basin. •`%� 1 i i / , � _ `'�`^�-_�.� _-,..,-.�_,_,_ _ _��. - ! .�.� - - I - _ ---1 >» � - _ � - � I 1 \ \1
PHASE 2 SEQUENCE OF CONSTRUCTION � J I t r �-✓ ^� � �,�'" 1 � / �'- '
1. Complete exterior site improvements. :�',J 1 / v��z �- �J 1 l // -- - --
2. Stabilize work area with pavement or permanent seeding where necessary. 50 0
3, Install landscape plants.
4. Remove temporary controls after all work areas have been stabilized. PHASE 1 BUILDING PHASE 2 E&S PLAN
Sc01e in Feet
SLOPE•� 0
• �1le-w-u
STONE
STRUCTURE ID
010
D
La
W
d
d50
150' CULVERT
4.65
1 12
10
12
12
0.5
POND OUTFAL
0.10
1 12
10'
1 10
12
0.5
NOT TO SCALE
WITH
e"• CLFANOUT & 45' TO
SURFACE WITH SCREW CAP
EXCAVATE AREA BELOW INVERT
731.5 TO PROVIDE 8,000 CUBIC
) FEET STROAGE
NO GRADE
ADE SEE GRADING
PLAN ON SHEET 4
- /-
1-20'3-12"• HOPE OUTLET PIPE
(ADS N-12)
INSTALL THE OUTFACE
RUN TO DAYLIGHT
RUN our=731,2t
s'-sro scH as PVC
PERFORATED PIPE
LOW FLOW PERFORATED PIPE TREATMENT:
STRUCTURE AND BERM AS PART
INV IN-731.50
PERFORATED PIPE WITH A NON-WAVEN
FILTER FABRIC.
OF THE PHASE 1 BUILDING,
PROVIDE TWO ROWS OF
BET, COVER, AND SURROUND PERFORATED PIPE
AFTER PHASE 1 E&S MEASURES
7-1/2"0 HOLES 0 12" CC ON
EACH SIDE OF PIPE AT
WITH
WA MINIMUM OF 10" OF #57 STONE
HORIZONTAL MID SECTION
SECTION
THROUGH TEMPORARY SEDIMENT
BASIN OUTFALL
NOT TO SCALE
SFDIMFNT TRAP CAICUIATIONS
BASIN ID
TOTAL
TOTAL
WET
WET
WET
DRY
DRY
DRY
DRAINAGE
STORAGE
STORAGE DEPTH
STORAGE AREA
STORAGE VOLUME
STORAGE DEPTH
STORAGE AREA
STORAGE VOLUME
AREA
VOLUME REQ'D.
SB1
42.7 ac
538 c.y.
(t4,472 c.f.)
1.50 ft.
5,300 a.f.
8,000 c.f.
3.50 1t
22,000 9J,
17,000 0.
TEMPORARY SEDIMENT BASIN/CULVERT OUTLET DETAIL
THE SEDIMENT BASIN WILL BE DESIGNED USING SPECIFIC PARAMETERS
THAT APPLY TO THIS SITE. THE TOTAL CONTRIBUTING DRAINAGE AREA
IS 42.7 ACRES. PEAK RUNOFF RATES FROM THE CDA ARE GENERALLY
LOW DUE TO THE LAND COVER AND SOILS. LOW RUNOFF RATES ARE
EVIDENCED BY THE CHARACTER OF THE DRAINAGE SWALE ON THE
SITE. IT IS IMPRACTICAL TO PROVIDED 134 CUBIC YARDS PER ACRES
OF CDA IN THE SEDIMENT BASIN AND UNNECESSARY DUE TO
CHARACTER OF THE CDA. AS A PRACTICAL ALTERNATIVE, THE WET AND
DRY STORAGE VOLUMES WILL BE BASED ON THE 3.9 ACRES OF
DISTURBED AREA.
EROSION & SEDIMENT CONTROL KEY
3.02
TEMPORARY STONE
CONSTRUCTION
CE
ENTRANCE
3.05
SILT FENCE
3.07
INLET PROTECTION
IP
_0-
3.14 TEMPORARY
SEDIMENT BASIN
SB
3.18 OUTLET PROTECTION
OP
3.30
TOPSOILING
3.32
PERMANENT SEEDING
pg
3.35
MULCHING
MU --
3.38
TREE PROTECTION
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0�4IONAL
SURVEY: C.I.:
p-L 1,
DRAWN BY: JOB NO.:
P-L 2110031
SCALE: DATE:
AS SHOWN 6/12/23
SHEET: 3A/ 1