APPLICANT PACKET - Virginia Department of Conservation and ...

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STD & SPEC 3.13 TEMPORARY SEDIMENT TRAP Practice Description A temporary ponding area formed by constructing an earthen embankment with a stone outlet, used to detain sediment-laden runoff from small disturbed areas long enough to allow the majority of the sediment to settle out. Conditions Where Practice Applies 1. Below disturbed areas where the total contributing drainage is less than 3 acres. 2. Where the sediment trap will be used no longer than 18 months (the maximum useful life is 18 months). 3. The sediment trap may be constructed either independently or in conjunction with a TEMPORARY DIVERSION DIKE (Std. & Spec. 3.09). Construction Specifications 1. Outlet: The outlet for the sediment trap shall consist of a stone section of the embankment located at the low point in the basin. A combination of course aggregate and riprap shall be used to provide for filtering/detention as well as outlet stability. The smaller stone shall be VDOT #3, #357, or #5 Coarse Aggregate (smaller stone sizes will enhance filter efficiency) and riprap shall be "Class I". Filter cloth which meets the physical requirements noted in Std. & Spec. 3.19, RIPRAP shall be placed at the stone-soil interface to act as a "separator." The minimum length of the outlet shall be 6 feet times the number of acres comprising the total area draining to the trap. The crest of the stone outlet must be at least 1.0 foot below the top of the embankment to ensure that the flow will travel over the stone and not the embankment. The outlet shall be configured as noted in Plate 3.13-2. 2. Embankment Cross Section: The maximum height of the sediment trap embankment shall be 5 feet as measured from the base of the stone outlet. Minimum top widths (W) and outlet heights (Ho) for various embankment heights (H) are shown in Plate 3.13-1. Side slopes of the embankment shall be 2:1 of flatter. 3. The area under the embankment shall be cleared, grubbed, and stripped of any vegetation and root mat. 4. Fill material for the embankment shall be free of roots or other woody vegetation, organic material, large stones, and other objectionable material. The embankment should be compacted in 6-inch layers by traversing with construction equipment. Applicant Packet 63 June 2001 ST
5. The earthen embankment shall be seeded with temporary or permanent vegetation (see Std. & Spec.'s 3.31 and 3.32) immediately after installation. 6. Construction operations shall be carried out in such a manner that erosion and water pollution are minimized. 7. The structure shall be removed and the area stabilized when the upslope drainage area has been stabilized. 8. All cut and fill slopes shall be 2:1 or flatter (except for excavated, wet storage area which may be at a maximum 1:1 grade). Applicant Packet 64 June 2001
Page 1 and 2:
VIRGINIA RESPONSIBLE LAND DISTURBER
Page 3 and 4:
About the RLD Certification Exam/Te
Page 5 and 6:
TABLE OF CONTENTS INTRODUCTION ....
Page 7 and 8:
LAW AND REGULATIONS SECTION LEARNIN
Page 9 and 10:
DISCUSSION OF REGUALTED LAND-DISTUR
Page 11 and 12:
MINIMUM STANDARDS All regulated lan
Page 13 and 14:
MS-17 Where construction vehicle ac
Page 15 and 16:
PRINCIPLES AND PRACTICES SECTION LE
Page 17 and 18: FACTORS INFLUENCING EROSION There a
Page 19 and 20: Detachment by flowing water is conf
Page 21 and 22: The shape of slopes can affect eros
Page 23 and 24: The entire site work force should b
Page 25 and 26: Have sediment basins been installed
Page 27 and 28: Flumes 3.15 Temporary Slope Drain..
Page 29 and 30: The filter cloth utilized shall be
Page 31 and 32: STD & SPEC 3.03 CONSTRUCTION ROAD S
Page 33 and 34: STD & SPEC. 3.05 SILT FENCE Practic
Page 35 and 36: 2. The filter fabric shall be purch
Page 37 and 38: Applicant Packet 32 June 2001
Page 39 and 40: STD & SPEC 3.07 STORM DRAIN INLET P
Page 41 and 42: 2. Gravel and Wire Mesh Drop Inlet
Page 43 and 44: 3. Block and Gravel Drop Inlet Sedi
Page 45 and 46: 4. Excavated Drop Inlet Sediment Tr
Page 47 and 48: 5. Gravel Curb Inlet Sediment Filte
Page 49 and 50: 6. Block and Gravel Curb Inlet Sedi
Page 51 and 52: Maintenance 1. The structure shall
Page 53 and 54: 2. Culvert Inlet Sediment Trap a. G
Page 57 and 58: STD & SPEC 3.09 TEMPORARY DIVERSION
Page 59 and 60: STD & SPEC 3.10 TEMPORARY FILL DIVE
Page 61 and 62: STD & SPEC 3.11 TEMPORARY RIGHT-OF-
Page 63 and 64: TABLE 3.11-A SPACING OF RIGHT OF WA
Page 65 and 66: DV STD & SPEC 3.12 DIVERSION Practi
Page 67: . Disturbed areas draining into the
Page 73 and 74: Using the Unified Soil Classificati
Page 77 and 78: 12. Safety: All state and local req
Page 79 and 80: TSD STD & SPEC 3.15 TEMPORARY SLOPE
Page 81 and 82: Table 3.15-A SIZE OF SLOPE DRAIN Ma
Page 85 and 86: 1. (a) Seeding with straw mulch and
Page 87 and 88: STD & SPEC 3.18 OUTLET PROTECTION P
Page 89 and 90: STD & SPEC 3.19 RIPRAP Practice Des
Page 91 and 92: Stone Placement: Placement of ripra
Page 93 and 94: STD & SPEC 3.20 ROCK CHECK DAMS Pra
Page 97 and 98: STD & SPEC 3.24 TEMPORARY VEHICULAR
Page 99 and 100: e. The culvert(s) shall be covered
Page 103 and 104: j. Non-erodible materials such as r
Page 107 and 108: STD & SPEC 3.26 DEWATERING STRUCTUR
Page 109 and 110: 2. Straw Bale/Silt Fence Pit (see P
Page 111 and 112: Maintenance (All dewatering structu
Page 113 and 114: Fill Slope Applications For Areas W
Page 115 and 116: STD & SPEC 3.31 TEMPORARY SEEDING T
Page 117 and 118: TABLE 3.31-B ACCEPTABLE TEMPORARY S
Page 119 and 120:
the seeding rate of any spring seed
Page 121 and 122:
3. Appropriate seeding mixtures for
Page 123 and 124:
TABLE 3.32-B SITE SPECIFIC SEEDING
Page 125 and 126:
Seedbed Requirements: Vegetation sh
Page 127 and 128:
lime, fertilizer and seed. Legume i
Page 129 and 130:
APPENDIX 3.32-b KEYS TO SUCCESSFUL
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Sources: Readily available as seed
Page 133 and 134:
7. Sericea Lespedeza (Lespedeza cun
Page 135 and 136:
Quality of Sod 1. Sod used shall be
Page 137 and 138:
Maintenance of Established Sod 1. D
Page 139 and 140:
Cool Season Grasses 4 lbs. nitrogen
Page 141 and 142:
Applicant Packet 136 June 2001
Page 143 and 144:
Maintenance All mulches and soil co
Page 145 and 146:
d. Weight shall average 0.90 lbs./s
Page 147 and 148:
TREATMENT-2: SOIL STABILIZATION MAT
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