HomeMy WebLinkAbout21-23 Site Plan page 3B rev 121523EROSION AND SEDIMENT CONTROL NARRATIVE: _____-_ 742--1 ----_ -
Project Description _ _ _ "'-'-_-_---- 1 �_ '- "----�
This project is located on Route 626 Rest Church Road. The owner proposes to construct a new multi -purpose ?�` g'-rAnaNG sE sncK
and a new sanctuary building along with associated parking and other site improvements. Proposed
improvements are planned to begin during the fall of 2026.
Existing Site Conditions
The project site will be located on a 11.84 acre parcel which currently is used as a church facility. \ �\`✓ n , - - ` / = >
Flood Plain
The parcel contains no floodplain.
Soils
The USGS Soils map shows the predominant soil type on the site is 148, Frederick- Poplimento looms. This soil
is generally fairly deep (25"-72"), well -drained, and residuum of limestone. The Hydrologic Soils Group is "B".�1 I
See Sheet 9. �4- -------
100" am
Adjacent Areas
The adjacent properties are used for residential purposes.
Off-siteAreas �,,. �\ II i
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.
The disturbed area is approximately 3.9 acres. \\\
PHASE 2 BUILDING -PHASE 1 EROSION AND SEDIMENT CONTROL MEASURES \
3.02 A stone and gravel entrance will be installed from the existing drive aisle as a construction entrance and , \ f
a staging area and will be be maintained in a condition which will prevent tracking or flow of mud onto the
public rights -of -way. This may require periodic top dressing with additional stone or the washing and reworking 1 /� \\ \\ I 1 1
\ J
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. The use of water trucks to remove materials dropped, washed, or tracked onto roadways I \ `
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
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 _\\
needed shall be dressed to conform with the existing grade and stabilized. _ `=_�•\' - - �X x
3.14 The temporary sediment basin constructed on .the site with Phase 1 Building will be used to control sediment_'�'\� x_
generated from the earthwork operation. This facility will be inspected after each rain storm and repairs made as necessary.
3.31 Temporary seeding in accordance with the E & S Std & Spec 3.31 will be applied to the topsoil stock R/ " �\ N\ 1 / I INN
pile and all areas which will not be brought to final grade within 30 days. Embankment or excavated slopes r-� �l1 it I \\.'.. I r/ 1 _
denuded for a period of greater than 30 days shall be temporarily seeded and mulched. All temporary seeding _- -,Y\ a
areas will be mulched in accordance with the schedule included herein. \
Temporary Seeding
SEED TYPE RATE MIN. PURITY(%) MIN. GERM.(%) --- I �4
Sept 1- Feb 15: \� I I I I I \1 1
Annual Ryegrass 50 Ib/ac 98 85 I I a, •I I i \� \
Winter Rye 50 Ib/ac 98 85
May 1 - Aug 31: J"�'\1°°'
or
German Millet 50 Ib/ac 98 85 ,� \ \ \\ \ N.
16 - Apr 30: \`\ g _ \\\ ` ` \ \\\ \\ \ N. \ \\\lkaib
-
Annual ryegrass 75 Ib/ac 98 85 , �, i>
Mulch: 1.5 ton/ac small grain straw
Fertilizer: 1000 Ib/ac 10-10-10 .� tl L jYe- t
3.38 Tree protection will be established by installing orange safety fencing around the drip lines of selected ; --- _---��
trees as shown on the plans. Inspect the fencing weekly and make repairs as necessary. \ i N.
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PHASE 2 BUILDING -PHASE 2 EROSION AND SEDIMENT CONTROL MEASURES
I IX
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3.05 Silt fence will be maintained installed in selected locations downstream from the construction areas and ^
)gflil.r
the drainfields. Silt fence will be installed around the downstream side of any topsoil stockpiles. Silt fences shall S�\ a �:� N_�
be inspected after each rainfall and at least daily during prolonged rainfall. Any required repairs shall be made
>e,
immediately. Damaged, .decomposed or otherwise .ineffective silt fence shall be replaced. .Sediment deposits
should be removed after each storm event. They must be removed when deposits reach approximately one-half -� �J I j i �-✓ `� ". _ ��� J _� ,�-'1'--- -:-�- the height of the barrier. Any sediment deposits remaining in place after the silt fence is no longer needed
shall be dressed to conform with the existing grade and stabilized.
3.07 Inlet protection will be constructed at all inlets immediately after installation. Inlets shall be inspected after PHASE 2 BUILDING PHASE 1 E&S PLAN
each rainfall and at least daily during prolonged rainfall. Any required repairs shall be made immediately. _
Damaged or otherwise ineffective devices shall be replaced. Sediment deposits should be removed after each -''---- 762 -
- - - _ 1 -----
storm event. They must be removed when deposits reach approximately one-half the height of the barrier. -- S, PABwN� SE a4cK
3.30 Replacement of topsoil will generally occur throughout the work site where vegetation is to be
reestablished. Topsoil will be uniformly spread and rolled to a minimum depth of 4". Topsoil shall not be
placed while in a frozen or wet condition.
3.32 All disturbed areas will be stabilized by permanent seeding in accordance with the schedule included /`.`- j - / - _ - i�
herein. The anticipated time for construction is fall 2023 through fall 2028.
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 / I / ✓^ _ \ 1
of the project, soil stockpiles shall be stabilized or protected with sediment trapping measures. The contractor �/ B oG' eRL
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:
Seedbed Preparation:
a. Scarify top 1" to 2" of soil after final grades have been achieved.
b. Add 3 tons per acre pulverized agricultural limestone(1401b/1000sf).ng a
SEED TYPE RATE MIN. PURITY(%) MIN. GERM.(%)
Tall fescue 120 Ib/oc 97 85 1 �\ I \ N.
Red clover 8 Ib/ac 95 65
Ladino clover 8 Ib/ac 95 65
Nurse Grass -(season dependent)
Sept 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 v \ ��-
or
Feb 16 - Apr 30:
Annual ryegross 12 Ib/ac 98 85
Mulch: 1.5 ton/ac small grain straw
Fertilizer: 1000 Ib/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 appropriate erosion and
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. \ - - - _ sous•--���i-
4. Prior to commencingland disturbingactivities in areas other than indicated on these Ian (including,but not \\ ^^r. -' - - - -
limited to, off -site borrow or waste areas), the contractor shall submit a supplementary erosion and sediment r/ ^\ �\ .� / ^`
control plan to the VESCP Authority for review and approval 0 _ y
5. The contractor is responsible for installation of any additional erosion control measures necessary to prevent
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 g I I I. .1.:Al I 1 11 I
activities and during site development until final stabilization is achieved. I I I I 1 ti:.. f { i I 1 i `
7. All vegetative stabilization shall be uniform, mature enough to survive, and adequate to inhibit erosion.
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PHASE 1 SEQUENCE OF CONSTRUCTION \ L71 4 N. ``\
1. Install construction entrance.
2. Install silt fence along downstream perimeter of work areas and around the inlet of the existing detention ^��_;--________-� g \\ \\ \ \ N.
pond outlet. -�.. _-- ___
3. Install safety fence around trees to be preserved. �__--- �-. `�^ \\ I
4. Strip, stockpile and stabilize topeoil in location shown on the Site Erosion and Sediment Control Plan. Apply
temporary seeding. \
5. Perform rough grading over site. Insure that runoff from the disturbedareas is directed to the sediment
basin. �_� •� �I .I� ^^ �^ \ ` _J i i i m - J I 1 1
PHASE 2 SEQUENCE OF CONSTRUCTION '� 11 i ' j t , ''4-
1. Install drainage structures. �J J I J I / j , ✓^� �`^�- J -q� ' - - - _ _ _- _ _ HI \
2. Install inlet and outlet controls. y / /50 0 \ _ _ 5
3. Complete exterior site improvements. '
4. Stabilize work area with pavement or permanent seeding where necessary.
5. Install landscape plants. PHASE 2 BUILDING PHASE 2 E&S PLAN
6. Remove temporary controls after all work areas have been stabilized.
Scale in Feet
UIVLNSIUN IRUGE REQUIRED
WHERE GRADE EXCEEDS 2%
N OR GREATER
Z
EXISTING PAVED ro
ROADWAY -III-I I I
111-
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FILTER FABRIC
SECTION A
- A
NOTE:
SPILLWAY
USE NDBAGS, STRAW BALE.!
SEDIMENT BARRIER
OR ER APPROVED METH01
(STRAW BALE TYPE SHOWN)
TO HANNELIZE RUNOFF TO I
AS EQUIRED.
SUPPLY WATER TO WASH
WHEELS IF NECESSARY.
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d A $ I A
2"-3" COURSE
AGGREGATE
MIN. 6" THICK `4
K
z DIVERSION RIDGE
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 CLEANED
TEMPORARY
PRIOR TO ENTRANCE ONTO PUBLIC RIGHT-OF-WAY.
3. WHEN WASHING IS REQUIRED, IT SHALL BE DONE
G
GRAVEL
ON AN AREA STABILIZED WITH CRUSHED STONE
CONSTRUCTION
THAT DRAINS INTO AN APPROVED SEDIMENT TRAP
OR SEDIMENT BASIN.
ENTRANCE/EXIT
EXTRA STRENGTH FILTER FABRIC
NEEDED WITH WIRE SUPPORT
STEEL OR
WOOD POST 11�� �gyOF
TOT -
-.11171
S�.TTTi' 10 Fi MAX. SPACING WITH
W�WIWpE &FILTER FABRIC
TO UPHS,ISRECURELY
SIDE OF POST..
RUNOFF
'�- o' uev f�
12' MIN. 1-TTpRREEKf 12° MIN.
4*X6
i i wBA�PAC Ill -1 GRAVEL
STANDARD DETAIL ALTERNATE DETAIL
TRENCH WITH NATIVE BACKFILL TRENCH WITH GRAVEL
NOTE: 4. SET POSTS AND EXCAVATE A 4"x4'
1. INSPECT AND REPAIR FENCE AFTER EACH TRENCH UPSLOPE ANLONG THE LINE
STORM EVENT AND REMOVE SEDIMENT WHEN 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 FFABRIC TO THE WIRE
FENCING AND EXTEND
R INTO THE TRENCH.
SEDIMENT OFF -SITE AND CAN BE PERMANENTLY
7. BACKFILL AND COMPACT THE EXCAVATED
STABILIZED.
3. SILT FENCE SHALL BE PLACED ON SLOPE SOIL
EFFICIENCY.
CONTOURS TO MAXIMIZE PONDING EFFlCIENCY.
SILT FENCE DETAIL WITH WIRE SUPPORT
NOT TO SCALE ADDAPTED FROM: 1992 VA E&S CONTROL HANDBOOK 3.05
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STRUCTURE ID
1 010
D
I La
I W
d
d50
150' CULVERT1
4.65
1 12
10
12
12
0.5
POND OUTFAL
0.10
12
10
10
12
0.!�
CULVERT OUTLET PROTECTION DETAIL
NOT TO SCALE
TOP OF BERM ELEVATION®735.00
200' SPILLWAY ELEVATION-734.00
24'0 PLASTIC RISER BY ADS WITH
ADD 4" TO NEW BERM TO ALLOW
PEDESTRIAN H-10 GRATE
FOR SETTLEMENT
TOP-734.00
6" INV. IN-731.50
12" INV. OUr-731.50
610 CLEANOUT & 45' TO
-
I SURFACE WITH SCREW CAP
EXCAVATE AREA BELOW INVERT
731.5 TO PROVIDE 8,000 CUBIC
r APPROXIMATE FEET OF WET STROAGE
LISTING GRADE SEE GRADING PLAN ON SHEET 4
/-
~V�VV 20�PE OUTLET PIPE \
(ADS N-12)
INSTALL THE OUTFALL RUN TO DAYLIGHT 6 8 0 SCH 40 PVC LOW FLOW PERFORATED PIPE TREATMENT:
INV OUT-731.2t PERFORATED PIPE WRAP PERFORATED PIPE WITH A NON-WAVEN
STRUCTURE AND BERM AS PART INV IN-731.50 FILTER FABRIC.
OF THE PHASE 1 BUILDING, PROVIDE TWO ROWS OF BED, COVER, AND SURROUND PERFORATED PIPE
AFTER PHASE 1 E&S MEASURES EACH SIDE OF PIPE AT CC ON WITH A MINIMUM OF 10' OF #57 STONE.
HORIZONTAL MID SECTION
SECTION THROUGH TEMPORARY SEDIMENT BASIN OUTFALL
NOT TO SCALE
SEDIMENT TRAP CALCULATIONS
BASIN 10
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.
SB7
42.7 0e
(14,472 •c.f.)
1.50 ft.
5,300 0.
8,000 0.
3.50 ft
22,000 0.f,
1 17.000 C.f.
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
$F
X-X X_X
3.07
INLET PROTECTION
3.14 TEMPORARY
SEDIMENT BASIN
SB
3.18
OUTLET PROTECTION
OPMg
3.30
TOPSOILING
3.32
PERMANENT SEEDING
pg
3.35
MULCHING
MU
3.38
TREE PROTECTION
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SURVEY:
C.I.:
p_L
1,
DRAWN BY:
JOB NO.:
P-L
2110031
SCALE:
DATE:
AS SHOWN
6/12/23
SHEEP:
3B/12