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HomeMy WebLinkAboutWPO202200022 Plan - Other (not approved) 2022-12-07SHEET INDEX VICINITY MAP: 1" = 1,000' y e 9�e ItonP 44 Al0" Lp sr _t µ�C s -- SITE\'.- 317 'a 388 It Rd FY',pV/ :� 53 "O° m as e`\o L°O, 4/0 *I C� J �e Faso Sta C 2000 MARCHANT STANDARDS AND SPECIFICATIONS 1. VIRGINIA DEPARTMENT OF TRANSPORTATION (V.D.O.T.) ROAD AND BRIDGE SPECIFICATIONS, DATED 2020. 2. VIRGINIA DEPARTMENT OF TRANSPORTATION (V.D.O.T.) ROAD AND BRIDGE STANDARDS, DATED 2016. 3. VIRGINIA DEPARTMENT OF TRANSPORTATION (V.D.O.T.) WORK AREA PROTECTION MANUAL, DATED 2015. 4. VIRGINIA DEPARTMENT OF CONSERVATION AND RECREATION, DIVISION OF SOIL AND WATER CONSERVATION, VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION, 1992. 5. INSTITUTE OF TRANSPORTATION ENGINEERS (ITE MANUAL), TRIP GENERATION, 11TH EDITION. 6. VIRGINIA MANUAL FOR UNIFORM TRAFFIC CONTROL DEVICES (MUTCD) STANDARDS, DATED 2009. 7. ALBEMARLE COUNTY SERVICE AUTHORITY CONSTRUCTION SPECIFICATIONS REGULATING THE CONSTRUCTION AND EXPANSION OF THE WATER AND SEWER SYSTEMS WITHIN THE COUNTY OF ALBEMARLE, VIRGINIA, DATED 2018. 8. INTERNATIONAL CODE COUNCIL AMERICAN NATIONAL STANDARD- ACCESSIBLE & USABLE BUILDINGS AND FACILITIES, DATED 2021. SURVEYOR'S LEGEND UTILITIES LEGEND BH BORE HOLE GAS LINE G BM BENCH MARK PHONE LINE UGT CO CLEAN OUT OVERHEAD ELECTRIC OHE DIP DUCTILE IRON PIPE SANITARY SEWER S E SANITARY SEWER MANHOLE UNDERGROUND ELECTRIC- UGE IF IRON FOUND WATER LINE W MF MONUMENT FOUND EX. STORM DRAIN LINE PF PIPE FOUND PROP. STORM DRAIN LINE PKNS P-K NAIL SET S SIGN WM WATER METER WV WATER VALVE 240AK40 = 24" OAK W/ 40' CANOPY DIA. DEMOLITION LEGEND TBS TO BE SAVED TBR TO BE REMOVED EX. EXISTING SITE ELEMENT TO BE REMOVED 1 TREE TO BE REMOVED - x UTILITY LINE TO BE REMOVED WPO/VSMP WP02022-00022 ALBEMARLE COUNTY, VIRGINIA MAY 19, 2022 EROSION & SEDIMENT CONTROL NOTES 1. ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992) AND VIRGINIA REGULATIONS VR 625-02-00 EROSION AND SEDIMENT CONTROL REGULATIONS. 2. THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION. 3. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS THE FIRST STEP IN CLEARING. THE CITY OF CHARLOTTESVILLE E&S INSPECTOR MUST BE CALLED (434-970-3182) IMMEDIATELY AFTER INITIAL MEASURES ARE IN PLACE AND BEFORE THE START OF ANY FURTHER CONSTRUCTION. 4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN AND NARRATIVE SHALL BE MAINTAINED ON THE SITE AT ALL TIMES. 5. PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN INDICATED ON THESE PLANS( INCLUDING, BUT NOT LIMITED TO, OFF -SITE BORROW OR WASTE AREAS), THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY. 6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING AUTHORITY. 7. 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. 8. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING DEVICE. 9. THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND AFTER EACH RUNOFF PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY. 10. ALL FILL MATERIAL SHALL BE TAKEN FROM AN APPROVED, DESIGNATED BORROW AREA. 11. ALL WASTE MATERIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EARTH FILL SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND OTHER DEBRIS. 12. BORROW, FILL OR WASTE ACTIVITY SHALL BE CONDUCTED IN A SAFE MANNER THAT MAINTAINS LATERAL SUPPORT, OR ORDER TO MINIMIZE ANY HAZARD TO PERSONS, PHYSICAL DAMAGE TO ADJACENT LAND AND IMPROVEMENTS, AND DAMAGE TO ANY PUBLIC STREET BECAUSE OF SLIDES, SINKING, OR COLLAPSE. 13. TEMPORARY STABILIZATION SHALL BE TEMPORARY SEEDING AND MULCHING. SEEDING IS TO BE AT 75 LBS/ACRE, AND IN THE MONTHS OF SEPTEMBER TO FEBRUARY TO CONSIST OF A 50/50 MIX OF ANNUAL RYEGRASS AND CEREAL WINTER RYE, OR IN MARCH AND APRIL TO CONSIST OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN MILLE STRAW MULCH IS TO BE APPLIED AT 80LBS/1000SF. ALTERNATIVES ARE SUBJECT TO APPROVED BY THE CITY OF CHARLOTTESVILLE E & S INSPECTOR. 14. PERMANENT STABILIZATION SHALL BE LIME AND FERTILIZER, PERMANENT SEEDING, AND MULCH. AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT 90LBS/1000SF, INCORPORATED INTO THE TOP 4-6 INCHES OF SOIL. FERTILIZER SHALL BE APPLIED AT 1000LBS/ACRE AND CONSIST OF A 10-20-10 NUTRIENT MIX. PERMANENT SEEDING SHALL BE APPLIED AT 180LBS/ACRE AND CONSIST OF 95% KENTUCKY 31 OR TALL FESCUE AND 0-5% PERENNIAL RYEGRASS OR TURF TYPE TALL FESCUE. STRAW MULCH IS TO BE APPLIED AT 80LBS/1000SF. ALTERNATIVES ARE SUBJECT TO APPROVED BY THE CITY OF CHARLOTTESVILLE E & S INSPECTOR. 15. MAINTENANCE: ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH RAINFALL. ANY DAMAGE OR CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIR IMMEDIATELY. SILT TRAPS ARE TO BE CLEANED WHEN 50% OF THE WET STORAGE VOLUME IS FILLED WITH SEDIMENT. ALL SEEDED AREAS ARE TO BE RESEEDED WHEN NECESSARY TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION DIKES WHICH ARE COLLECTING SEDIMENT TO HALF THEIR HEIGHT MUST BE CLEANED AND REPAIRED IMMEDIATELY. 16. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE REMOVED WITHIN 30 DAYS OF FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER NEEDED SUBJECT TO APPROVAL BY THE CITY OF CHARLOTTESVILLE E & S INSPECTOR. 17. CONTRACTOR SHALL ADD ADDITIONAL MEASURES, NOT SHOWN ON THE PLANS, AS REQUIRED BY THE COUNTY EROSION CONTROL INSPECTOR. MAINTENANCE NOTES IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY AND AFTER EACH SIGNIFICANT RAINFALL. THE FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR. 1. THE INLET PROTECTION WILL BE CHECKED REGULARLY FOR SEDIMENT CLEANOUT. 2. THE GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP WHICH WOULD PREVENT DRAINAGE. IF THE GRAVEL IS CLOGGED BY SEDIMENT, IT SHALL BE REMOVED AND CLEANED OR REPLACED. 3. THE SILT FENCE BARRIER WILL BE CHECKED REGULARLY FOR UNDERMINING OR DETERIORATION OF THE FABRIC. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHES HALF WAY TO THE TOP OF THE BARRIER. 4. THE SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS MAINTAINED. AREAS SHALL BE FERTILIZED AND RESEEDED AS DETERMINED NECESSARY BY VIRGINIA TECH SITE DEVELOPMENT DEPARTMENT. SHEET # SHEET TITLE EC100 COVER SHEET EC101 EROSION CONTROL PLAN NARRATIVE EC102 EXISTING CONDITIONS EC103 EROSION CONTROL PLAN -STAGE A EC104 EROSION CONTROL PLAN - STAGE B EC105 EROSION CONTROL DETAILS EC106 EROSION CONTROL DETAILS SW 100 PRE -DEVELOPMENT D.A. MAP SWIM POST -DEVELOPMENT D.A. MAP SW 102 STORMWATER MODEL (1 YR) SW103 STORMWATER MODEL (IOYR) SW 104 STORMWATER QUALITY MAP SW105 VRRM SPREADSHEETS SW106 STORMWATER MANAGEMENT DETAILS SW 107 STORMWATER MANAGEMENT DETAILS SW 108 STORMWATER MANAGEMENT MAINTENANCE SITE DATA DEVELOPER: VIRGINIA PACIFIC INVESTMENTS LLC CONTACT: ALLAN CADGENE PROPERTY OWNER: VIRGINIA PACIFIC INVESTMENTS LLC 2088 UNION STREET - SUITE 1 SAN FRANCISCO, CA 94123 TAX MAP / PARCEL #: 78-21 HO PROPERTY ADDRESS: 2000 MARCHANT STREET PROPERTY SIZE: 1.36 ACRES ZONING: LI - LIGHT INDUSTRY ZONING OVERLAY DISTRICTS: MANAGED STEEP SLOPES OVERLAY DISTRICT MAGISTERIAL: SCOTTSVILLE COMPREHENSIVE PLAN: NEIGHBORHOOD 4 EXISTING USE: MULTI -FAMILY RESIDENTIAL PROPOSED USE: MANUFACTURING/PROCESSING/ASSEMBLY/FABRICATION/RECYCLING AND BY -RIGHT ACCESSORY DWELLING UNITS IN ACCORDANCE WITH LETTER OF DETERMINATION LOD201900003 DRINKING WATER WATERSHED: NONE DAM INUNDATION ZONE: NO SURVEY SOURCES: KIRK HUGHES & ASSOCIATES LAND SURVEYORS & PLANNERS 220 EAST HIGH STREET CHARLOTTESVILLE, VIRGINIA 22902 (434) 296-6942 JANUARY 7, 2020, UPDATED ON DECEMBER 15, 2021 DATUM: HORIZONTAL NAD-83 VIRGINIA SOUTH ZONE, VERTICAL NAVD-88. BENCHMARK: BENCH MARK #1 - IRON ROD SET W/ CAP - ELEV.=383.94' BENCH MARK #2 - IRON ROD SET W/ CAP - ELEV.=385.56' MISS UTILITY TICKET NUMBER: A804500955 APPROVALS: waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 TH OP .v CO f r� Alan G. Franklin Lic. No. 35326 0 10-19-2022 W. �`rIONAL ti��~ professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number WPO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions COVER SHEET sheet title EC I sheet number EROSION & SEDIMENT CONTROL NARRATIVE PROJECT DESCRIPTION THIS RE-DEVELOPMONT PROJECT PROPOSES TO ADD EIGHT (8) SMALL "MAKER SPACE" LIVE/WORK COTTAGES, RENOVATE A SMALL EXISTING PARKING LOT, AND ADD TWO OTHER SMALL PARKING LOTS TO THE 2000/2010 MARCHANT PROPERTY. THE PROJECT SITE IS 2000 MARCHANT STREET IN CHARLOTTESVILLE, VIRGINIA ACROSS THE STREET FROM THE HISTORIC WOOLEN MILLS SITE. IT IS TAX MAP PARCEL NUMBER 78-21 HO IN ALBEMARLE COUNTY. THE PROPERTY ACREAGE IS 1.36 ACRES AND THE DEVELOPMENT IMPROVEMENTS WILL ENCROACH ONTO A SMALL, ADJACENT PIECE OF VACANT LAND THAT LIES BETWEEN THE MARCHANT STREET RIGHT OF WAY AND THE SUBJECT PROPERTY. THERE WILL BE 1.0 ACRE OF DISTURBANCE ASSOCIATED WITH THIS PROJECT. ALL OF THE DISTURBANCE WILL OCCUR BETWEEN BROADWAY STREET, MARCHANT STREET, AND THE EXISTING LARGE RESIDENTIAL STRUCTURE ON SITE WHICH IS CURRENTLY A MIX OF TURF, PAVEMENT, AND LARGE SPECIMEN TREES. THE TOPOGRAPHY STEEPLY RISES FROM THE STREET AND THEN IS RELATIVELY FLAT FOR MOST OF THE DISTURBED AREA. THE PROPOSED GRADING WILL CLOSELY MATCH THE EXISTING TOPOGRAPHY WHERE POSSIBLE IN ORDER TO PRESERVE SEVERAL OF THESE SPECIMEN TREES. THERE WILL BE AN INCREASE OF IMPERVIOUS AREA WITHIN THE LIMITS OF DISTURBANCE FROM 10,364 SQUARE FEET TO 19,600 SQUARE FEET. INCREASED STORM RUNOFF FROM THIS DEVELOPMENT WILL BE MANAGED THROUGH THE USE OF PERMEABLE PAVEMENT IN THE PARKING AREAS, A RAIN GARDEN, AND AN UNDERGROUND STORMWATER DETENTION TANK WHICH WILL ALLOW FOR RELEASE OF STORMWATER BACK INTO THE EXISTING DOWNSTREAM STORM SYSTEM AT ACCEPTABLE RATE. SITE CONSTRUCTION WILL BEGIN JANUARY OF 2023 AND CONCLUDE BY DECEMBER OF 2023. EXISTING CONDITIONS THE PROJECT SITE IS HOME TO A LARGE, HISTORIC, 2-STORY HOUSE AND A SMALL, 2-STORY, HISTORIC COTTAGE. THE STRUCTURES RESIDE ROUGHLY IN THE MIDDLE OF THE PARCEL, WHICH IS ALSO THE HIGH POINT IN GRADE. THE LAND SLOPES AT APPROXIMATELY 10% AWAY FROM THE HOUSE TOWARD BROADWAY STREET AND 20%AWAY FROM THE HOUSE TOWARD THE RAILROAD. THERE IS AN EXISTING PAVED PARKING AREA BETWEEN THE HOUSE AND BROADWAY. THERE REMAINDER OF THAT AREA IS LAWN AND SOME LARGE TREES. THE LAND BETWEEN THE HOUSE AND THE RAILROAD IS LAWN WITH SOME LARGE TREES. THE SITE USE IS RESIDENTIAL BUT IT IS ZONED LIGHT INDUSTRIAL. ADJACENT AREAS THE ADJACENT LAND IS DEVELOPED LIGHT INDUSTRIAL/OFFICE. OFF -SITE AREAS AREAS WITHIN THE BROADWAY STREET AND MARCHANT STREET RIGHT-OF-WAY ARE SHOWN TO BE DISTURBED AND PROTECTED FROM EROSION AS PART OF THIS PLAN. ALL EARTHEN MATERIALS WILL BE GENERATED OR WASTED ON -SITE, OR WILL COME FROM OR BE TAKEN TO A SITE WITH AN APPROVED GRADING PERMIT. SOILS PER THE USDA WEB SITE, SOILS ON -SITE ARE IDENTIFIED AS CATOCTIN SILT LOAM -15 TO 25%SLOPES (SOILS GROUPI2D), YADKIN CLAY LOAM - 7 TO 15%SLOPES (SOILS GROUP 23C), RABUN CLAY LOAM - 2 TO 7%SLOPES (SOILS GROUP 71 B). AL L SOILS ARE IN HSG B. CRITICAL AREAS THE PROJECT AREA IS SMALL AND THE DISTURBED AREAS WILL BE QUICKLY STABILIZED WITH GRAVEL BASE. THE REMAINING AREAS ARE SMALL AND EASILY STABILIZED WITH VEGETATION THAT EROSION PROBLEMS ARE NOT ANTICIPATED AND EROSION PROTECTION SHOULD BE EASILY ACCOMPLISHED. EROSION AND SEDIMENT CONTROL MEASURES UNLESS OTHERWISE INDICATED, ALL EROSION AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992). 1. TEMPORARY CONSTRUCTION ENTRANCE - E&S STD. & SPEC. 3.02 A TEMPORARY CONSTRUCTION ENTRANCE SHALL BE INSTALLED WHERE INDICATED. THE CONSTRUCTION ENTRANCE SHALL BE PAVED WITH A WASH RACK. 2. SILT FENCE - E&S STD. & SPEC. 3.05 SILT FENCE SHALL BE INSTALLED IN A SEQUENCED MANNER AS SHOWN ON THE PLAN. 3. INLET PROTECTION - E&S STD. & SPEC. 3.07 INLET PROTECTION SHALL BE INSTALLED AROUND STORM DRAIN DROP OR CURB INLETS TO PREVENT SEDIMENT FROM ENTERING STORM DRAINAGE SYSTEMS PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA. 4. TEMPORARY DIVERSION DIKE - E&S STD. & SPEC. 3.09 A TEMPORARY RIDGE OF COMPACTED SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING DISTURBED AREA.. 3. TEMPORARY SEDIMENT TRAP - E&S STD. & SPEC. 3.13 A TEMPORARY SEDIMENT TRAP SHALL BE INSTALLED WHERE INDICATED ON THE PLANS. SEE ATTACHED CALCULATIONS FOR SIZING AND THE TABLE ON THE PLANS FOR DIMENSION SPECIFICATIONS. 4. TOPSOILING - E&S STD. & SPEC. 3.30 TOPSOIL WILL BE STRIPPED FROM AREAS TO BE GRADED AND STOCKPILED FOR LATER USE. STOCKPILE LOCATIONS SHALL BE LOCATED ON -SITE AND ARE TO BE STABILIZED WITH TEMPORARY VEGETATION. SELECTION OF THE SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR IT IS APPLIED. PRIOR TO LAND -DISTURBING ACTIVITIES, THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY E & S PLAN TO THE OWNER COVERING THE OFF -SITE STOCKPILE AREA WHICH WOULD HAVE TO BE APPROVED BY THE PLAN APPROVING AUTHORITY BEFORE ANY OFF -SITE ACTIVITY COMMENCES. 5. TEMPORARY SEEDING: E&S STD. & SPEC. 3.31 ALL AREAS DISTURBED BY CONSTRUCTION THAT WILL NOT BE BROUGHT TO FINAL GRADE FOR A PERIOD OF MORE THAN 30 DAYS WILL BE STABILIZED WITH TEMPORARY SEEDING. UNLESS OTHERWISE SPECIFIED, TEMPORARY SEEDING WILL BE DONE WITH A SEED MIX APPROVED BY Inc OWNER PRIOR TO APPLICATION IN ACCORDANCE TO E&S STD. AND SPEC. 3.31 OF THE 1992 VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992). 6. PERMANENT SEEDING: E&S STD. & SPEC. 3.32 ALL AREAS DISTURBED BY CONSTRUCTION WILL BE STABILIZED WITH PERMANENT SEEDING IMMEDIATELY FOLLOWING THE CONCLUSION OF CLEARING OPERATIONS. UNLESS OTHERWISE SPECIFIED, PERMANENT SEEDING WILL BE DONE WITH A SEED MIX APPROVED BY THE OWNER PRIOR TO APPLICATION IN ACCORDANCE TO E&S STD. AND SPEC. 3.32 OF THE 1992 VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992). 7. MULCHING: E&S STD. & SPEC. 3.35 AREAS WHICH HAVE BEEN PERMANENTLY SEEDED SHOULD BE MULCHED IMMEDIATELY FOLLOWING SEEDING 8. .SOIL STABILIZATION BLANKETS AND MATTING: E&S STD. & SPEC. 3.36 THE INSTALLATION OF A PROTECTIVE COVERING (BLANKET) OR A SOIL STABILIZATION MAT ON A PREPAREDPLANTING AREA OF A STEEP SLOPE, CHANNEL OR SHORELINE. 9. DUST CONTROL - E&S STD. & SPEC. 3.39 DUST CONTROL PRACTICES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY BE HARMFUL OR INJURIOUS TO HUMAN HEALTH, WELFARE, OR SAFETY, OR TO ANIMAL OR PLANT LIFE. MANAGEMENT STRATEGIES 1. CONSTRUCTION SHOULD BE SEQUENCED SO THAT GRADING OPERATIONS CAN BEGIN AND END AS QUICKLY AS POSSIBLE. 2. THE SITE CONTRACTOR SHALL BE RESPONSIBLE FOR THE INSTALLATION AND MAINTENANCE OF ALL EROSION AND SEDIMENT CONTROL PRACTICES. 3. SEDIMENT TRAPPING MEASURES SHALL BE INSTALLED AS A FIRST STEP IN GRADING AND SHALL BE SEEDED AND MULCHED IMMEDIATELY FOLLOWING INSTALLATION. 4. AREAS WHICH ARE NOT TO BE DISTURBED SHALL BE CLEARLY MARKED BY FLAGS, SIGNS, ETC. 5. TEMPORARY SEEDING OR OTHER STABILIZATION WILL FOLLOW IMMEDIATELY AFTER GRADING. 6. AFTER ACHIEVING ADEQUATE STABILIZATION, THE TEMPORARY E&S CONTROLS WILL BE CLEANED UP AND REMOVED, AND THE SEDIMENT BASINS WILL BE CLEANED OUT AND CONVERTED TO PERMANENT STORMWATER MANAGEMENT BASINS IF APPLICABLE. SOIL STOCKPILES AND BORROW AREAS TOPSOIL WILL BE STRIPPED FROM AREAS TO BE GRADED AND STOCKPILED FOR LATER USE. STOCKPILE LOCATIONS SHALL BE LOCATED ON -SITE AND ARE TO BE STABILIZED WITH TEMPORARY VEGETATION. SELECTION OF THE SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR IT IS APPLIED. NO OFF -SITE AREAS WILL BE DISTURBED AS PART OF THIS PROJECT. 1. CLEARLY MARK LIMITS OF WORK. 2. ESTABLISH CONSTRUCTION ENTRANCE AND INSTALL CULVERT INLET PROTECTION ON EXISTING PIPE INLET ADJACENT TO CONSTRUCTION ENTRANCE AS SHOWN ON THE PLAN. UTILIZE NEARBY FIRE HYDRANT FOR TIRE WASHING. 3. INSTALL PERIMETER SILT FENCING, INLET PROTECTION, TREE PROTECTION, AND ALL OTHER PERIMETER MEASURES AS SHOWN ON THE PLAN. 4. ESTABLISH STAGING AREA AND STOCKPILE AREA AS SHOWN ON PLAN. 5. RE-ROUTE GAS LINE AS SHOWN ON THE PLANS. MAINTAIN EROSION CONTROL AT DOWNHILL PERIMETER OF UTILITY TRENCH. 6. ONCE GAS UTILITIES ARE RE-ROUTED, INSTALL TEMPORARY SEDIMENT TRAP AND ASSOCIATED DIVERSION DIKES. 7. ESTABLISH ROUGH GRADES SHOWN ON STAGE A PLAN AND INSTALL TEMPORARY SEEDING ON ALL DISTURBED AREAS. 8. CONSTRUCT BUILDING PADS AND CONTINUE BUILDING CONSTRUCTION WHILE MAINTAINING SEDIMENT TRAP. 9. MOVE TO STAGE B ESC PLAN. 10. WHILE CONTINUING TO MAINTAIN SEDIMENT TRAP, BEGIN INSTALLATION OF PARKING LOT SUB -BASE, CURBING, AND TRENCH DRAINS. 11. MAINTAIN SEDIMENT TRAP AS LONG AS POSSIBLE DURING PARKING LOT CONSTRUCTION. 12. AS THE TIME NEARS TO REMOVE THE SEDIMENT TRAP, STABILIZE ALL UPSTREAM DISTURBED AREAS WITH TURF OR GRAVEL, AND CONTACT THE COUNTY EROSION CONTROL OFFICER FOR APPROVAL. 13. IDENTIFY A LIKELY PERIOD OF DRY WEATHER AND DECOMMISSION THE SEDIMENT TRAP ACCORDINGLY. 14. INSTALL THE UNDERGROUND DETENTION SYSTEM AND INCOMING/OUTGOING STORM STRUCTURES WITH INLET AND OUTLET PROTECTION. 15. INSTALL ALL OTHER SITE PLAN UTILITIES, SIDEWALKS, PARKING LOTS, AND DRIVES WHILE MAINTAINING ADEQUATE DOWNSTREAM SEDIMENT TRAPPING MEASURES. 16. ONCE ALL FINAL GRADES ARE REACHED ON NON -PAVED AREAS BEGIN ESTABLISHMENT OF VEGETATION ON ALL DISTURBED AREAS WITH PERMANENT SEEDING OR SODDING, MULCHING, FERTILIZATION, AND LIMING. AMEND SOILS WHERE NEEDED. CONSULT WITH LANDSCAPE ARCHITECT BEFORE ESTABLISHING VEGETATION. 17. ONCE REMAINDER OF SITE HAS BEEN DEEMED STABILIZED BY THE COUNTY INSPECTOR AND ALL CONSTRUCTION ACTIVITIES ARE COMPLETED, RESTORE STAGING AND ACCESS AREAS TO ACCEPTABLE (PRE -CONSTRUCTION) CONDITIONS, INSTALL LANDSCAPE PLAN PLANTINGS, AND REMOVE ALL OTHER EROSION CONTROL MEASURES. MAINTENANCE IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY AND AFTER EACH RUNOFF PRODUCING RAINFALL EVENT. THE FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR: 1. THE GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP. IF THE GRAVEL IS CLOGGED BY SEDIMENT, IT SHALL BE REMOVED AND CLEANED OR REPLACED. 2. THE INLET PROTECTION WILL BE CHECKED REGULARLY FOR SEDIMENT CLEANOUT. 3. THE SILT FENCE BARRIER WILL BE CHECKED REGULARLY FOR UNDERMINING OR DETERIORATION OF THE FABRIC. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHES HALF WAY TO THE TOP OF THE BARRIER. 4. THE SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS MAINTAINED. AREAS SHALL BE FERTILIZED AND RE -SEEDED AS DETERMINED NECESSARY BY THE COUNTY INSPECTOR IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992). 5. ADDITIONAL MEASURES MAY BE REQUIRED AT THE REQUEST OF THE COUNTY INSPECTOR. THE CONTRACTOR SHALL BE RESPONSIBLE FOR THE INSTALLATION, MAINTENANCE, AND REMOVAL OF ALL EROSION AND SEDIMENT CONTROL PRACTICES AND RESTORATION OF ANY DAMAGED AREAS DURING CONSTRUCTION AND FOR ANY WARRANTY PERIOD. AFTER THE MAJORITY OF THE GRADING PROGRAM HAS BEEN EXECUTED THEY SHOULD BE REDRESSED WITH AN AMPLE DEPTH OF TOPSOIL FROM THE STOCKPILE AND SURFACE ROUGHENED. THEREAFTER, PERMANENT SEEDING AND MULCH SHOULD BE APPLIED. IF FOR SOME REASON, CONSTRUCTION IS HALTED OR DELAYED, EXPOSED AREAS ARE TO BE TREATED WITH TEMPORARY SEEDING AND MULCH UNTIL SUCH TIME AS CONSTRUCTION BEGINS. PERMANENT STABILIZATION AS MENTIONED ABOVE, PERMANENT SEEDING, LIME, FERTILIZATION, AND MULCHING IS TO BE APPLIED TO ALL AREAS NOT PROPOSED FOR HARDSCAPE OR BUILDING IMPROVEMENTS AS SOON AS POSSIBLE UNLESS OTHERWISE SPECIFIED ON THE LANDSCAPE PLAN. SEEDING SHALL BE DONE WITH KENTUCKY 31 TALL FESCUE ACCORDING TO STD. & SPEC. 3.32, PERMANENT SEEDING OF THE HANDBOOK. EROSION CONTROL BLANKETS WILL BE INSTALLED OVER FILL SLOPES WHICH HAVE BEEN BROUGHT TO FINAL GRADE AND HAVE BEEN SEEDED TO PROTECT THE SLOPES FROM RILL AND GULLY EROSION AND TO ALLOW SEED TO GERMINATE PROPERLY. MULCH (STRAW OR FIBER) WILL BE USED ON RELATIVELY FLAT AREAS. IN ALL SEEDING OPERATIONS, SEED FERTILIZER AND LIME WILL BE APPLIED PRIOR TO MULCHING. STORMWATER RUNOFF CONSIDERATIONS THIS RE -DEVELOPMENT PROJECT CREATES AN INCREASE OF IMPERVIOUS COVER AND SUBSEQUENTLY AN INCREASE IN RUNOFF VOLUME AND PEAK FLOW FROM THE DEVELOPMENT SITE TO THREE EXISTING OUTFALLS (1, 2,& 3). AT OUTFALLS 1 AND 3, THE RUNOFF/VOLUME INCREASE IS MINOR AND IS ADDRESSED BY MAINTAINING THE RUNOFF AS SHEET FLOW THAT IN OPINION OF THE ENGINEER OF RECORD WILL NOT CAUSE OR CONTRIBUTE TO EROSION, SEDIMENTATION, OR FLOODING OF DOWN GRADIENT PROPERTIES OR RESOURCES AND THAT NO FURTHER WATER QUANTITY CONTROLS ARE REQUIRED PER 9VAC25-870-66(D). TO ADDRESS THE INCREASED RUNOFF VOLUME AND PEAK FLOW AT OUTFALL 2, THE TWO PARKING LOTS WILL BE CONSTRUCTED OF PERMEABLE PAVERS, A RAIN GARDEN WILL BE CONSTRUCTED TO HELP ATTENUATE RUNOFF FROM BUILDING ROOFS, AND AN UNDERGROUND STORMWATER DETENTION SYSTEM ARE PROPOSED. A MAJORITY OF THE PROPOSED DEVELOPMENT STORMWATER WILL BE ROUTED TO THE UNDERGROUND DETENTION SYSTEM AND RELEASED TO AN EXISTING 12" CMP UNDER MARCHANT STREET (OUTFALL 2) AS REQUIRED BY 9VAC25-870-66(B) & (C). IN ORDER TO SATISFY THE TP LOAD REDUCTION REQUIREMENTS FOR THIS RE -DEVELOPMENT ACTIVITY, THE TWO ON -SITE PARKING BAYS WILL BE CONSTRUCTED OF PERMEABLE CONCRETE INTERLOCKING PAVEMENT (PERMEABLE PAVEMENT - LEVEL 1) AND A RAIN GARDEN (RAIN GARDEN #1) WILL ALSO BE CONSTRUCTED. ADDITIONALLY, NUTRIENT CREDITS PURCHASED FROM AN APPROVED NUTRIENT BANK WILL ALSO BE REQUIRED BECAUSE THE PROPOSED WQ BMPS DO NOT REMOVE THE ENTIRE REQUIRED TP LOAD REDUCTION. MINIMUM STANDARDS INSTALLATION OF ALL EROSION AND SEDIMENT CONTROL MEASURES SHALL CONFORM TO THE 1992 VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992). CRITICAL MEASURES REQUIRED ON THIS PROJECT ARE SUMMARIZED BELOW: 1. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT FOR LONGER THAN 14 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR. 2. DURING CONSTRUCTION OF THE PROJECT, SOIL STOCK PILES AND BORROW AREAS SHALL BE STABILIZED OR PROTECTED WITH SEDIMENT TRAPPING MEASURES. THE APPLICANT IS RESPONSIBLE FOR THE TEMPORARY PROTECTION AND PERMANENT STABILIZATION OF ALL SOIL STOCKPILES ON SITE AS WELL AS BORROW AREAS AND SOIL INTENTIONALLY TRANSPORTED FROM THE PROJECT SITE. 3. A PERMANENT VEGETATIVE COVER SHALL BE ESTABLISHED ON DENUDED AREAS NOT OTHERWISE PERMANENTLY STABILIZED. PERMANENT VEGETATION SHALL NOT BE CONSIDERED ESTABLISHED UNTIL A GROUND COVER IS ACHIEVED THAT IS UNIFORM, MATURE ENOUGH TO SURVIVE AND WILL INHIBIT EROSION. 4. SEDIMENT BASINS AND TRAPS, PERIMETER DIKES, SEDIMENT BARRIERS AND OTHER MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP IN ANY LAND -DISTURBING ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. 5. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION. 6. SEDIMENT TRAPS AND SEDIMENT BASINS SHALL BE DESIGNED AND CONSTRUCTED BASED UPON THE TOTAL DRAINAGE AREA TO BE SERVED BY THE TRAP OR BASIN. a. THE MINIMUM STORAGE CAPACITY OF A SEDIMENT TRAP SHALL BE 134 CUBIC YARDS PER ACRE OF DRAINAGE AREA AND THE TRAP SHALL ONLY CONTROL DRAINAGE AREAS LESS THAN THREE ACRES. b. SURFACE RUNOFF FROM DISTURBED AREAS THAT IS COMPRISED OF FLOW FROM DRAINAGE AREAS GREATER THAN OR EQUAL TO THREE ACRES SHALL BE CONTROLLED BY A SEDIMENT BASIN. THE MINIMUM STORAGE CAPACITY OF A SEDIMENT BASIN SHALL BE 134 CUBIC YARDS PER ACRE OF DRAINAGE AREA. THE OUTFALL SYSTEM SHALL, AT A MINIMUM, MAINTAIN THE STRUCTURAL INTEGRITY OF THE BASIN DURING A 25-YEAR STORM OF 24-HOUR DURATION. RUNOFF COEFFICIENTS USED IN RUNOFF CALCULATIONS SHALL CORRESPOND TO A BARE EARTH CONDITION OR THOSE CONDITIONS EXPECTED TO EXIST WHILE THE SEDIMENT BASIN IS UTILIZED. 7. CUT AND FILL SLOPES SHALL BE DESIGNED AND CONSTRUCTED IN A MANNER THAT WILL MINIMIZE EROSION. SLOPES THAT ARE FOUND TO BE ERODING EXCESSIVELY WITHIN ONE YEAR OF PERMANENT STABILIZATION SHALL BE PROVIDED WITH ADDITIONAL SLOPE STABILIZING MEASURES UNTIL THE PROBLEM IS CORRECTED. 8. CONCENTRATED RUNOFF SHALL NOT FLOW DOWN CUT OR FILL SLOPES UNLESS CONTAINED WITHIN AN ADEQUATE TEMPORARY OR PERMANENT CHANNEL, FLUME OR SLOPE DRAIN STRUCTURE. 9. WHENEVER WATER SEEPS FROM A SLOPE FACE, ADEQUATE DRAINAGE OR OTHER PROTECTION SHALL BE PROVIDED. 10. ALL STORM SEWER INLETS THAT ARE MADE OPERABLE DURING CONSTRUCTION SHALL BE PROTECTED SO THAT SEDIMENT -LADEN WATER CANNOT ENTER THE CONVEYANCE SYSTEM WITHOUT FIRST BEING FILTERED OR OTHERWISE TREATED TO REMOVE SEDIMENT. 11. BEFORE NEWLY CONSTRUCTED STORMWATER CONVEYANCE CHANNELS OR PIPES ARE MADE OPERATIONAL, ADEQUATE OUTLET PROTECTION AND ANY REQUIRED TEMPORARY OR PERMANENT CHANNEL LINING SHALL BE INSTALLED IN BOTH THE CONVEYANCE CHANNEL AND RECEIVING CHANNEL. 12. WHEN WORK IN A LIVE WATERCOURSE IS PERFORMED, PRECAUTIONS SHALL BE TAKEN TO MINIMIZE ENCROACHMENT, CONTROL SEDIMENT TRANSPORT AND STABILIZE THE WORK AREA TO THE GREATEST EXTENT POSSIBLE DURING CONSTRUCTION. NONERODIBLE MATERIAL SHALL BE USED FOR THE CONSTRUCTION OF CAUSEWAYS AND COFFERDAMS. EARTHEN FILL MAY BE USED FOR THESE STRUCTURES IF ARMORED BY NONERODIBLE COVER MATERIALS. 13. WHEN A LIVE WATERCOURSE MUST BE CROSSED BY CONSTRUCTION VEHICLES MORE THAN TWICE IN ANY SIX-MONTH PERIOD, A TEMPORARY VEHICULAR STREAM CROSSING CONSTRUCTED OF NONERODIBLE MATERIAL SHALL BE PROVIDED. 14. ALL APPLICABLE FEDERAL, STATE AND LOCAL REQUIREMENTS PERTAINING TO WORKING IN OR CROSSING LIVE WATERCOURSES SHALL BE MET. 15. THE BED AND BANKS OF A WATERCOURSE SHALL BE STABILIZED IMMEDIATELY AFTER WORK IN THE WATERCOURSE IS COMPLETED. 16. UNDERGROUND UTILITY LINES SHALL BE INSTALLED IN ACCORDANCE WITH THE FOLLOWING STANDARDS IN ADDITION TO OTHER APPLICABLE CRITERIA: a. NO MORE THAN 500 LINEAR FEET OF TRENCH MAY BE OPENED AT ONE TIME. b. EXCAVATED MATERIAL SHALL BE PLACED ON THE UPHILL SIDE OF TRENCHES. c. EFFLUENT FROM DEWATERING OPERATIONS SHALL BE FILTERED OR PASSED THROUGH AN APPROVED SEDIMENT TRAPPING DEVICE, OR BOTH, AND DISCHARGED IN A MANNER THAT DOES NOT ADVERSELY AFFECT FLOWING STREAMS OR OFF -SITE PROPERTY. d. MATERIAL USED FOR BACKFILLING TRENCHES SHALL BE PROPERLY COMPACTED IN ORDER TO MINIMIZE EROSION AND PROMOTE STABILIZATION. e. RESTABILIZATION SHALL BE ACCOMPLISHED IN ACCORDANCE WITH THIS CHAPTER. f. APPLICABLE SAFETY REQUIREMENTS SHALL BE COMPLIED WITH. 17. WHERE CONSTRUCTION VEHICLE ACCESS ROUTES INTERSECT PAVED OR PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY VEHICULAR TRACKING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS TRANSPORTED ONTO A PAVED OR PUBLIC ROAD SURFACE, THE ROAD SURFACE SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED FROM THE ROADS BY SHOVELING OR SWEEPING AND TRANSPORTED TO A SEDIMENT CONTROL DISPOSAL AREA. STREET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER. THIS PROVISION SHALL APPLY TO INDIVIDUAL DEVELOPMENT LOTS AS WELL AS TO LARGER LAND -DISTURBING ACTIVITIES. 18. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER FINAL SITE STABILIZATION OR AFTER THE TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE VESCP AUTHORITY. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION. 19. PROPERTIES AND WATERWAYS DOWNSTREAM FROM DEVELOPMENT SITES SHALL BE PROTECTED FROM SEDIMENT DEPOSITION, EROSION AND DAMAGE DUE TO INCREASES IN VOLUME, VELOCITY AND PEAK FLOW RATE OF STORMWATER RUNOFF FOR THE STATED FREQUENCY STORM OF 24-HOUR DURATION IN ACCORDANCE WITH THE FOLLOWING STANDARDS AND CRITERIA. STREAM RESTORATION AND RELOCATION PROJECTS THAT INCORPORATE NATURAL CHANNEL DESIGN CONCEPTS ARE NOT MAN-MADE CHANNELS AND SHALL BE EXEMPT FROM ANY FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL OR MAN-MADE CHANNELS: a. CONCENTRATED STORMWATER RUNOFF LEAVING A DEVELOPMENT SITE SHALL BE DISCHARGED DIRECTLY INTO AN ADEQUATE NATURAL OR MAN-MADE RECEIVING CHANNEL, PIPE OR STORM SEWER SYSTEM. FOR THOSE SITES WHERE RUNOFF IS DISCHARGED INTO A PIPE OR PIPE SYSTEM, DOWNSTREAM STABILITY ANALYSES AT THE OUTFALL OF THE PIPE OR PIPE SYSTEM SHALL BE PERFORMED. b. ADEQUACY OF ALL CHANNELS AND PIPES SHALL BE VERIFIED IN THE FOLLOWING MANNER: (1) THE APPLICANT SHALL DEMONSTRATE THAT THE TOTAL DRAINAGE AREA TO THE POINT OF ANALYSIS WITHIN THE CHANNEL IS 100 TIMES GREATER THAN THE CONTRIBUTING DRAINAGE AREA OF THE PROJECT IN QUESTION; OR (2) (a) NATURAL CHANNELS SHALL BE ANALYZED BY THE USE OF A TWO-YEAR STORM TO VERIFY THAT STORMWATER WILL NOT OVERTOP CHANNEL BANKS NOR CAUSE EROSION OF CHANNEL BED OR BANKS; (b) ALL PREVIOUSLY CONSTRUCTED MAN-MADE CHANNELS SHALL BE ANALYZED BY THE USE OF A 10-YEAR STORM TO VERIFY THAT STORMWATER WILL NOT OVERTOP ITS BANKS AND BY THE USE OF A TWO-YEAR STORM TO DEMONSTRATE THAT STORMWATER WILL NOT CAUSE EROSION OF CHANNEL BED OR BANKS; AND (c) PIPES AND STORM SEWER SYSTEMS SHALL BE ANALYZED BY THE USE OF A 10-YEAR STORM TO VERIFY THAT STORMWATER WILL BE CONTAINED WITHIN THE PIPE OR SYSTEM. c. IF EXISTING NATURAL RECEIVING CHANNELS OR PREVIOUSLY CONSTRUCTED MAN-MADE CHANNELS OR PIPES ARE NOT ADEQUATE, THE APPLICANT SHALL: (1) IMPROVE THE CHANNELS TO A CONDITION WHERE A 10-YEAR STORM WILL NOT OVERTOP THE BANKS AND A TWO-YEAR STORM WILL NOT CAUSE EROSION TO THE CHANNEL, THE BED, OR THE BANKS; (2) IMPROVE THE PIPE OR PIPE SYSTEM TO A CONDITION WHERE THE 10-YEAR STORM IS CONTAINED WITHIN THE APPURTENANCES; (3) DEVELOP A SITE DESIGN THAT WILL NOT CAUSE THE PRE -DEVELOPMENT PEAK RUNOFF RATE FROM A TWO-YEAR STORM TO INCREASE WHEN RUNOFF OUTFALLS INTO A NATURAL CHANNEL OR WILL NOT CAUSE THE PRE -DEVELOPMENT PEAK RUNOFF RATE FROM A 10-YEAR STORM TO INCREASE WHEN RUNOFF OUTFALLS INTO A MAN-MADE CHANNEL; OR (4) PROVIDE A COMBINATION OF CHANNEL IMPROVEMENT, STORMWATER DETENTION OR OTHER MEASURES WHICH IS SATISFACTORY TO THE VESCP AUTHORITY TO PREVENT DOWNSTREAM EROSION. d. THE APPLICANT SHALL PROVIDE EVIDENCE OF PERMISSION TO MAKE THE IMPROVEMENTS. e. ALL HYDROLOGIC ANALYSES SHALL BE BASED ON THE EXISTING WATERSHED CHARACTERISTICS AND THE ULTIMATE DEVELOPMENT CONDITION OF THE SUBJECT PROJECT. f. IF THE APPLICANT CHOOSES AN OPTION THAT INCLUDES STORMWATER DETENTION, HE SHALL OBTAIN APPROVAL FROM THE VESCP OF A PLAN FOR MAINTENANCE OF THE DETENTION FACILITIES. THE PLAN SHALL SET FORTH THE MAINTENANCE REQUIREMENTS OF THE FACILITY AND THE PERSON RESPONSIBLE FOR PERFORMING THE MAINTENANCE. g. OUTFALL FROM A DETENTION FACILITY SHALL BE DISCHARGED TO A RECEIVING CHANNEL, AND ENERGY DISSIPATORS SHALL BE PLACED AT THE OUTFALL OF ALL DETENTION FACILITIES AS NECESSARY TO PROVIDE A STABILIZED TRANSITION FROM THE FACILITY TO THE RECEIVING CHANNEL. It. ALL ON -SITE CHANNELS MUST BE VERIFIED TO BE ADEQUATE. i. INCREASED VOLUMES OF SHEET FLOWS THAT MAY CAUSE EROSION OR SEDIMENTATION ON ADJACENT PROPERTY SHALL BE DIVERTED TO A STABLE OUTLET, ADEQUATE CHANNEL, PIPE OR PIPE SYSTEM, OR TO A DETENTION FACILITY. j. IN APPLYING THESE STORMWATER MANAGEMENT CRITERIA, INDIVIDUAL LOTS OR PARCELS IN A RESIDENTIAL, COMMERCIAL OR INDUSTRIAL DEVELOPMENT SHALL NOT BE CONSIDERED TO BE SEPARATE DEVELOPMENT PROJECTS. INSTEAD, THE DEVELOPMENT, AS A WHOLE, SHALL BE CONSIDERED TO BE A SINGLE DEVELOPMENT PROJECT. HYDROLOGIC PARAMETERS THAT REFLECT THE ULTIMATE DEVELOPMENT CONDITION SHALL BE USED IN ALL ENGINEERING CALCULATIONS. k. ALL MEASURES USED TO PROTECT PROPERTIES AND WATERWAYS SHALL BE EMPLOYED IN A MANNER WHICH MINIMIZES IMPACTS ON THE PHYSICAL, CHEMICAL AND BIOLOGICAL INTEGRITY OF RIVERS, STREAMS AND OTHER WATERS OF THE STATE. I. ANY PLAN APPROVED PRIOR TO JULY 1, 2014, THAT PROVIDES FOR STORMWATER MANAGEMENT THAT ADDRESSES ANY FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL OR MAN-MADE CHANNELS SHALL SATISFY THE FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL OR MAN-MADE CHANNELS IF THE PRACTICES ARE DESIGNED TO (1) DETAIN THE WATER QUALITY VOLUME AND TO RELEASE IT OVER 48 HOURS; (11) DETAIN AND RELEASE OVER A 24-HOUR PERIOD THE EXPECTED RAINFALL RESULTING FROM THE ONE YEAR, 24-HOUR STORM; AND (111) REDUCE THE ALLOWABLE PEAK FLOW RATE RESULTING FROM THE 1.5, 2, AND 10-YEAR, 24-HOUR STORMS TO A LEVEL THAT IS LESS THAN OR EQUAL TO THE PEAK FLOW RATE FROM THE SITE ASSUMING IT WAS IN A GOOD FORESTED CONDITION, ACHIEVED THROUGH MULTIPLICATION OF THE FORESTED PEAK FLOW RATE BY A REDUCTION FACTOR THAT IS EQUAL TO THE RUNOFF VOLUME FROM THE SITE WHEN IT WAS IN A GOOD FORESTED CONDITION DIVIDED BY THE RUNOFF VOLUME FROM THE SITE IN ITS PROPOSED CONDITION, AND SHALL BE EXEMPT FROM ANY FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL OR MAN-MADE CHANNELS AS DEFINED IN ANY REGULATIONS PROMULGATED PURSUANT TO § 62.1-44.15:54 OR 62.1-44.15:65 OF THE ACT. m. FOR PLANS APPROVED ON AND AFTER JULY 1, 2014, THE FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS OF § 62.1-44.15:52 A OF THE ACT AND THIS SUBSECTION SHALL BE SATISFIED BY COMPLIANCE WITH WATER QUANTITY REQUIREMENTS IN THE STORMWATER MANAGEMENT ACT (§ 62.1-44.15:24 ET SEQ. OF THE CODE OF VIRGINIA) AND ATTENDANT REGULATIONS, UNLESS SUCH LAND -DISTURBING ACTIVITIES (1) ARE IN ACCORDANCE WITH PROVISIONS FOR TIME LIMITS ON APPLICABILITY OF APPROVED DESIGN CRITERIA IN 9VAC25-870-47 OR GRANDFATHERING IN 9VAC25-870-48 OF THE VIRGINIA STORMWATER MANAGEMENT PROGRAM (VSMP) REGULATION, IN WHICH CASE THE FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS OF § 62.1-44.15:52 A OF THE ACT SHALL APPLY, OR (11) ARE EXEMPT PURSUANT TO § 62.1-44.15:34 C 7 OF THE ACT. in. COMPLIANCE WITH THE WATER QUANTITY MINIMUM STANDARDS SET OUT IN 9VAC25-870-66 OF THE VIRGINIA STORMWATER MANAGEMENT PROGRAM (VSMP) REGULATION SHALL BE DEEMED TO SATISFY THE REQUIREMENTS OF THIS SUBDIVISION 19. waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions EROSION CONTROL PLAN NARRATIVE sheet title EC101 sheet number waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 I I I r TOPOGRAPHY NOTES 1.) TITLE SOURCE ED TMP 78-21 H TVIRGINIA PACIFIC INVESTMENTS, LLCt�CfGDB 5040-20, 23 PLATrPARCEL "C"y1.361 ACRES lin6SURVEYOR'S CERTIFICATION 2 <v2.) DATUM: HORIZONTAL NAD-83 VIRGINIA SOUTH ZONE, VERTICAL NAVD-88 ESTABLISHED BY GPS.THIS TOPOGRAPHIC SURVEY WAS COMPLETED UNDER THE DIRECT AND RESPONSIBLE CHARGE OF,rFHA450 1 3.) NO UNDERGROUND INVESTIGATION OF UTILITIES WAS PERFORMED. THE CONTRACTOR SHALL DETERMINE THE EXACT LOCATION KIRK HUGHES, L.S. FROM AN ACTUAL GROUND SURVEY MADE UNDER MY SUPERVISION; THAT THE RAILROAD NOTE ���~ (p2,521 GPMN OF ALL EXISTING UTILITIES BEFORE COMMENCING WORK. THE CONTRACTOR AGREES TO BE FULLY RESPONSIBLE FOR ANY AND ALL BY RIGHT OF WAY FOR RAILROAD IS PER DB 274-70 AND THE RIGHT OF WAY DAMAGES WHICH MIGHT BE OCCASIONED BY HIS OR HER FAILURE TO EXACTLY LOCATE AND PRESERVE ANY AND ALL ORIGINAL DATA WAS OBTAINED STARTING ON MAP O RY DIGITAL THRU JANUARY 7, 2020, UPDATED LOADING DOCK AND TRACK MAP FOR THE CHESAPEAKE AND OHIO RAILWAY COMPANY I N I UNDERGROUND UTILITIES. ON DECEMBER 15, 2021; AND THAT THIS PLAT, MAP OR DIGITAL GEOSPATIAL DATA INCLUDING F J DATED JUNE 30, 1916, AND LAST REVISED JULY 17, 1978. THIS CONFLICTS METADATA MEETS MINIMUM ACCURACY STANDARDS UNLESS OTHERWISE NOTED. WITH FIELD MONUMENTATION AND PLATS OF RECORD FOR THE SUBJECT 15 MISS UTILITY TICKET A804500955 Taken: 02/14/1810:51 AM AND ADJACENT PROPERTIES. professional seal i I MISS UTILITY CONTACT INFORMATION: TELEPHONE: 1-800-552-7001. TMP RTNE #1820BROADWAYSTREET I ANTEC PARTNERSHIP � W EUGENE RYANG 4.) PROPERTY LIES WITHIN FLOOD ZONE 'X", NOT A F. .. DEFINED 100-YEAR FLOOD DB 854-116 1 STORY METAL WAREHOUSE I N Q J Q x project manager 1 STORY METAL WAREHOUSE PARCEL A W w o #1822 BROADWAY STREET DB 693-352 PLAT Q a O m END OF STATE MAINTENANCE SIGN (LI ZONING) �?o ALAN FRANKLIN 0 mi 5 0 project team - m 365 I q' DIP z a _ K 0 "HKBR C. � I�\7 34 PINE / / / OJMAPLE """��! n I / I III � g � �\ ITYGAS ` qX.J U/C II 4 MA }� \III N O O APPR O 30I'POPLAR \ -� I `J G we 0 EDGE PAH'I. J I(7 0 28" HICKORY HVAC'S MOI III \ /� i LAWN I / QGM'S HVAC® I LAWN/ 4-F TTJtEESAPLIR,IGS 3,73\ -r � 3 "SPRUCEI I } y1 I I FFE3952. I I W {• .FFE395.a' I I I 2I'MAGNOLIA I I / / I 1 9 SScoBo-�oRCH .39am°oecx I II I I 0) I I I I l l O I`KRRYS�I I CSw �L #2000 J/ 30' MULB - - O -i l 2-STY. 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IN 364.2' (10"PVC) 375 S { \ 2-STORY I / D 42- T / O l -�� /. #2010 SG N 368.1'(8"DROP) 2 PACIFIC INVESTMENTS LLC II � / � / / VA I / EME (LI ZONING) INV. 364.2' 1 \ // client INV.OU 64.0'(10"PVC) \ ULTI 14 � - o � �BL.15"Ha RY - - S 7°34'57 W 339 / / IRS �O��P ( \ - - - pgy� y1 2088 UNION STREET, SUITE 1 DBL. 1 "MMULU'BRY. \ �\ CHIMNEY wM GINAP I F1U iPUCo Eswr T - 5 OHU Cil / COMCASTBOX R " e uFT / MAIL b / ; w r SAN FRANCISCO, CA 9413 � - / / x-;' Y COGOcCy / project address \� uL�` Nv= .2' /------- ONTO IMARC ANTST EET\F. In I 9'/1 "M ABRY, r 12'CM ti 4'MULB INV:384.1J EpGEPAV'-� \ ,� ��� K4 0SSCoz I�H(PRtATfO�� E N / / F / W P02022-00022 SSMH \ , 3, o \ \�, VEPCO 60 q sscoa DB 4 3-592 LAT / % / TOP=376.26'f 2'x3 G T I \ Oh Og4�6 - _ _ --EDGEPAv�_ / A - - MAI P P INV. 376.2 .9' �� \PRN N`E\ �j- - T -� - - - l �- l �. / project number INV. OUT=364.4' \ J TOP 375 I \ 8" T PZ �W- R.. CROSS s /\ �M� \NV 3748 U _Fr 1 1 fig. Oj -W�-WJ DIP PIREUS ►� ox l STREET CLOSED P RKmE \ 1 \ 11I �4" MAPLE SNAG C / S _ WU tWU -W _ / Y �` R.W.S 0' FORGR MAIN'APPPROX.I '� \ / p 7S / / \ S M A S A W AZE I / -Wj��s"s�`"� W� / GRAVELPARKING S I 1 / P WPO/VSM SDMH / \ \ -BENCH OHS v I \ e„MAPLE I oGEG vE l ----- /---------- project phase WV TOP=374.31' MAY 19, 2022 INV. IN=372.3' \ h \ y < _ _ _ / _ _� wM - - + �- I _ O - // INV. OUT=362.9'WY�� IGOT ' / RIGH OF WAY LINE j -370 - - - \ ER S / IRF J issue date \ \ �E_Mr� TMP 78-21Q WGARAGE-1 STORY 91 Iq,oy2,78GPM) EDGE OR SYLVESTER LAWRENCE, JR. & oi WARREN L. HERRING / ILL ESN S SO� - DB621-507 10 BROADWAY ST. (END) \ r _ 5� 5 -I F PARCEL'E" I ° Io MARCHANT ST. (BEGIN) DB 542-568 PLAT \ZONING) Iw / IRF �n�i TMP 78-21 P I I \ 0 .10\ cp ALFRED B. SADTLER - - _ _ 1LI ZONING ) /I SANITARY SEWER & WATERLINE SSMH RF \ \ 9LF DB 4278-469 SSMH EASEMENTS TOP=377.42' / \ cIT� LOT 6, BLOCK A TOP=389.73' TEMPORARY BENCH MARKS DB 342-197, 202 PLAT INV. IN=371.4' (10" TCPJ �C DB 338 308 PLAT INV. IN=385.7' (8" TCP) N.W. BENCH MARK # 1 (PUBLIC) V. IN=37 (4" CIP) DB 1579-591 PLAT INV. IN=386.2' (8" TCPJ NORTH IRON ROD SET W/ CAP IN . T=371.2' (10" TCPJ ALBEMARLE - WATER & SEWER (LI ZONING) CHARLOTTESVILLE CITY- SEWER INV. OUT=384.5' (8" TCP) ELEV: 383.94' FIELD CONTACT: SCOTT KREBELDER (434)531-0714 EXT 146 FIELD CONTACT: BENCHMARK (804)550-7740 (MANHOLE DRY) BENCH MARK #2 / COMCAST DOM ELEC DISTRIBUTION IRON ROD SET W/ CAPELEV =385.56' 800)441-6917 FIELD CONTACT: S & N (804)608-5640 I CENTURYLINK RIVANNA - WATER & SEWER / FIELD CONTACT: S & N (804)608-5640 FIELD CONTACT: TRAVIS GOODE (434)977-2970 EXT 204 CHARLOTTESVILLE CITY- GAS TING FIBER FIELD CONTACT: DERECK PERRY (540)836-7686 CHARLOTTESVILLECITY-WATER 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions EXISTING CONDITIONS sheet title EC102 sheet number 2 0 10' 20' 40' CONSTRUCTION SEQUENCE MAINTENANCE NOTES 1. CLEARLY MARK LIMITS OF WORK. 2. ESTABLISH CONSTRUCTION ENTRANCE AND INSTALL CULVERT INLET PROTECTION ON EXISTING PIPE INLET ADJACENT TO CONSTRUCTION ENTRANCE AS SHOWN ON THE PLAN. UTILIZE NEARBY FIRE HYDRANT FOR TIRE WASHING. 3. INSTALL PERIMETER SILT FENCING, INLET PROTECTION, TREE PROTECTION, AND ALL OTHER PERIMETER MEASURES AS SHOWN ON THE PLAN. 4. ESTABLISH STAGING AREA AND STOCKPILE AREA AS SHOWN ON PLAN. 5. RE-ROUTE GAS LINE AS SHOWN ON THE PLANS. MAINTAIN EROSION CONTROL AT DOWNHILL PERIMETER OF UTILITY TRENCH. 6. ONCE GAS UTILITIES ARE RE-ROUTED, INSTALL TEMPORARY SEDIMENT TRAP AND ASSOCIATED DIVERSION DIKES. 7. ESTABLISH ROUGH GRADES SHOWN ON STAGE A PLAN AND INSTALL TEMPORARY SEEDING ON ALL DISTURBED AREAS. 8. CONSTRUCT BUILDING PADS AND CONTINUE BUILDING CONSTRUCTION WHILE MAINTAINING SEDIMENT TRAP. 9. MOVE TO STAGE B ESC PLAN PLAN IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY AND AFTER EACH SIGNIFICANT RAINFALL. THE FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR. 1. THE INLET PROTECTION WILL BE CHECKED REGULARLY FOR SEDIMENT CLEANOUT. 2. THE GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP WHICH WOULD PREVENT DRAINAGE. IF THE GRAVEL IS CLOGGED BY SEDIMENT, IT SHALL BE REMOVED AND CLEANED OR REPLACED. 3. THE SILT FENCE BARRIER WILL BE CHECKED REGULARLY FOR UNDERMINING OR DETERIORATION OF THE FABRIC. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHES HALF WAY TO THE TOP OF THE BARRIER. 4. THE SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS MAINTAINED. AREAS SHALL BE FERTILIZED AND RE -SEEDED AS DETERMINED NECESSARY BY THE COUNTY INSPECTOR IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992). 5. ADDITIONAL MEASURES MAY BE REQUIRED AT THE REQUEST OF THE COUNTY INSPECTOR. E&SC MEASURES CE CONSTRUCTION ENTRANCE E&SC STD. 3.02 T$ TEMPORARY SEEDING E&SC STD. 3.31 SF SILT FENCE E&SC STD. 3.06 Sl PERMANENT SEEDING E&SC STD. 3.32 IP INLET PROTECTION E&SC STD. 3.07 ® SO SODDING E&SC STD. 3.33 CIP CULVERT INLET PROTECTION E&SC STD.3.08 ® MULCHING E&SC STD. 3.35 DD DIVERSION DIKE E&SC STD. 3.09 -DDDD- B( STABILIZATION MATTING ES&C STD. 3.36 ST TEMP. SEDIMENT TRAP E&SC STD. 3.13 TP TREE PROTECTION E&SC STD. 338 Tp OP OUTLET PROTECTION E&SC STD. 3.18 DC DUST CONTROL E&SC STD. 3.39 TO TOPSOILING E&SC STD. 3.30 SOILS INFO: SOILS GROUP12D - CATOCTIN SILT LOAM, 15 TO 25%SLOPES SOILS GROUP 23C -YADKIN CLAY LOAM, 7 TO 15%SLOPES SOILS GROUP 71 B - RABUN CLAY LOAM, 2 TO 7%SLOPES I c I cununvv uv�n N I TEMP. DIVERSION DD J DIKE #1 RAILROAD NOTE TEMP. SEDIMENT TRAP $T TP TREE PROTECTION TMP 7RTNERSHIP 80' RIGHT OF WAY FOR RAILROAD IS PER DB 274-70 AND THE N I D.A. = 0.60 AC. ANTEC PARTNERIGHT OF WAY AND TRACK MAP FOR THE THESAPEAKE AND _ 4' WIDE EMBANK. (TOP ELEV. 382.00) 1 STORYMETAL WAREHOUSE FENCING AT DB 854-1 16 OHIO RAILWAY COMPANY DATED DUNE 31,1916, AND LAST END OF STATE BOTTOM OF TRAP ELEV. 378.00 #1822BROA EET PARCEL A REVISED JULY 17, 1978. THIS CONFLICTS H FIELD PROJECT LIMITS #1820BROADWAYSTREET N MAINTENANCE SIGN WE STONE WEIR 5 ELEV. 37 1:1 SLOPE IN DB 693-352 PLAT 1 STORYMETAL WAREHOUSE AND ADJACENT N AND PUTS OF REC FOR THE SUBJECT S IL 23C WET VOLUME = 45 CY PREPARATION FOR MANAGED STEEP - J AND ADJACENT PROPERT� Ir DRY VOLUME = 58 CY SLOPES, TYP. (LI ZONING RETAINING WALL / TMP 77-40A _ SOI B BROADWAY CENTER LLC I - - _ _ _ _ _ EtF BaX-385 = - -471 _ (LI ZONING) I Ip L� I/' / / \5 DB 4436 814'TO 6"ARBORVITAE 10 E °SAS I /S LIMITS OF OUTE / /// R DISTURBANCE, TYP. _ \ �O I AS P IOR TO 2THI KOR (1.0 ACRE) - I I L - IN T,LLING TRAP F NEED D\ \ \ / \ / / O/ � MAPLE 4. A�(E III h i I O I D- I - I I / / / / / 0 30, POPLAR i' \ III--I�T� I SILT FEN E \ I I BLDG AD O 28"HICKORY l7" l 11 l $F I I I Huacs LIMIT , TYP. \ I I / /I I - � /4F TEE S�AIPILI-'-Gw HVAGX LAWN QGM EN ROUG 373 PgTECTN SITE I /)/ I 1 11 1:1 SL PE ('IS) GRAD n 0�l3�I SPRUCIEI PI \ I 1 C 11 1 I 2IMAGNOLIA rV ITI�� osseo PORCH I I I I I l OI P�N I I 0M/ ULBI/ CIP cswq I BRLCWALE 48„POPLAR 1-STY R�g/01 , / J I IoI lII jl I\ \II I1 w/2 / /V r 20' VEPCO ESMTO _____j___f_ �BR%SWiLEDB 564-50 (PRIVAT E)04L TRAL TELEPHONE (TEMPDIVER ON E3Fn5rTNasCOMPANYOFVA.ESML DB 628-485 (PRIVATE)WWW i IKE # CSw .SIP�D 2'MAGNOU IICHER Q y„CCD ATERIAL o 2:1 SLOP 49o.7 LIMITS OF VADISTURBANCTOCKPILE I ui3sC14, / MAINTAIN II� 5HICK ci ( W SSMH PAVEENAAS WAY � / TOP=372.9' O AOTHESUNE RF NTRANCE TR S E 9W..O.W.T FEN E /y� \� / // l [� O9342-J93PAT V �SF rAGNou4'HK �DB007-✓08 PLAT SSMH O TMP 78-21B TOP376.36' I o / 7 DB335-136PLAT OY INV. IN 364.2' (10" PVC) WOOLEN MILLS, LLC INV. IN 3P6D8RTOO(T8"PEDROP) 1 3V III�1111 II I I \ 1 \ D.A. TO DB 500024ANAG--6 STEEP NoNu364.2SLOP, TY j / y�P V T0(10" PVC) 75 )�DB 841-42AT 364P-sc R 0 O� ILI ZONING) INLET ULTI.kH�CTION / 2k3' GRATE INLET [] OM ^H/MNEY O YIT OHU TOP=375.8' \ OX 0- \ ` \row \ tlms SF� SF Ow ��/5q I I \ G F INV=374.8' SSMH � � I \ \� \ \\ � � j • ---- ONV/ TOP 376.26' \ \ T. tiL o swoo I I I Pao �iq�!!F / INV. IN364.9' \ T \ \�� \ I�C� INV. OUT364.4' l / p \ V D 6 / L+MA/N�PPRQX/ / / G / SDMH � H P ATE) EDGEPAV9. J J - - R. - i0P374.31' VT N,a I I I I I I T E TP r7 ON O \ ( 8„T P ox \ OTECTION1•I , W _Vlj A hyA / R. . CROZZG� - - INV. IN 372.3' ' I ` -Wj 3 -Y WJ _ 8 /P \ P EUSST \ � -I c INV. OUT 362.9' '�W� 0��� S W 4 M PLESNAC� / �) STREET �W j �W� �WB �W� -WB B / \ S M ` T MAPLE O 111 i VE 3 / R.W.S.A.60 FORCEMA/N(APPROX.� \ \ \ \ \� 383 ARK#> -OHV / \ wV (SILT FENCE F 1 I \ 11�p0EG T""ccc I � / MANAGED STEEP s� \��� ��� _�. /� \ - - I I SLOPES, TYP. fCA\ \� _ _ F �W�/ S �C [GOT R/GHI�OF LINE 1 c LRF -370 ` / GRAVEL P RKLNG \ TOP 389.73' I 1 FH / INV. IN 3857 (8" TCP) N. W. CD / S SILT FEN - / INV. IN 386.2' (8" TCP) NORTH yyA1ERL TMP 76 210 INV. OUT 384.5'(8" TCP) SYLVESTER LAWRENCE, JR. & _ \ / - / , (MANHOLE DRY) GRA�e WARREN L. HERRING 115 E�tN 8"0IP S PCSAS. , -- E- - t _/ E l / ( w I GARAGE-9STORY DB621-507 BROADWAYSi. (END) 1 C _ PARCEL "/ to MARCHANTST(BEGIN) S - _ SOILS LIMITS, TYP. SOILS LIMITS, TYP. s�o \� - - _ _ DB 542 568 PLAT ( 1 �� SOIL - _ (LI ZONING)LIMITS OF /1 I F �___ TMP 78-21 P DISTURBANCE, TYP. 28'SANfTARY SEWER & ���� ALFRED B. SADTLER (1.0ACRE) SOIL 12D WATERLINE EASEMENTS DB 4278-469 DB 342-197, 202 PLAT SOIL 23C (PUBLIC) SSMH LOT 6, BLOCK A TOPDB 338-308 PLAT INV. IN .42' / DB 1579-591 PLAT / / NV. N 371.4' (10" TCP1 / 0 10' 20' 4C INV. IN 372.4' (4"CIP) (LI ZONING) INV. OUT 371.2' (10" TCP) I waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 LTH OF vt� �r . r V y Alan G. Franklin Lic. No. 35326 .0 10-12-2022 <v. �`rIONAL ti�G~ professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase / MAY 19, 2022 i issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions EROSION CONTROL PLAN - STAGE A sheet title EC103 sheet number CONSTRUCTION SEQUENCE MAINTENANCE NOTES 1. WHILE CONTINUING TO MAINTAIN SEDIMENT TRAP, BEGIN INSTALLATION OF PARKING LOT SUB -BASE, CURBING, AND TRENCH IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY AND AFTER EACH SIGNIFICANT DRAINS. RAINFALL. THE FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR. 2. MAINTAIN SEDIMENT TRAP AS LONG AS POSSIBLE DURING PARKING LOT CONSTRUCTION. 1. THE INLET PROTECTION WILL BE CHECKED REGULARLY FOR SEDIMENT CLEANOUT. 3. AS THE TIME NEARS TO REMOVE THE SEDIMENT TRAP, STABILIZE ALL UPSTREAM DISTURBED AREAS WITH TURF OR GRAVEL, 2. THE GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP WHICH WOULD PREVENT DRAINAGE. AND CONTACT THE COUNTY EROSION CONTROL OFFICER FOR APPROVAL. IF THE GRAVEL IS CLOGGED BY SEDIMENT, IT SHALL BE REMOVED AND CLEANED OR REPLACED. 4. IDENTIFY A LIKELY PERIOD OF DRY WEATHER AND DECOMMISSION THE SEDIMENT TRAP ACCORDINGLY. 3. THE SILT FENCE BARRIER WILL BE CHECKED REGULARLY FOR UNDERMINING OR DETERIORATION OF THE FABRIC. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHES HALF WAY TO THE TOP OF 5. INSTALL THE UNDERGROUND DETENTION SYSTEM AND INCOMING/OUTGOING STORM STRUCTURES WITH INLET AND OUTLET THE BARRIER. PROTECTION. 4. THE SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS MAINTAINED. AREAS SHALL BE 6. INSTALL ALL OTHER SITE PLAN UTILITIES, SIDEWALKS, PARKING LOTS, AND DRIVES WHILE MAINTAINING ADEQUATE FERTILIZED AND RE -SEEDED AS DETERMINED NECESSARY BY THE COUNTY INSPECTOR IN ACCORDANCE WITH THE VIRGINIA DOWNSTREAM SEDIMENT TRAPPING MEASURES. EROSION & SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992). 7. ONCE ALL FINAL GRADES ARE REACHED ON NON -PAVED AREAS BEGIN ESTABLISHMENT OF VEGETATION ON WITH 5. ADDITIONAL MEASURES MAY BE REQUIRED AT THE REQUEST OF THE COUNTY INSPECTOR. PERMANENT SEEDING OR SODDING, MULCHING, FERTILIZATION, AND LIMING. AMEND SOILS WHERE NEEDED. CONSULT WITH LANDSCAPE ARCHITECT BEFORE ESTABLISHING VEGETATION. 8. ONCE REMAINDER OF SITE HAS BEEN DEEMED STABILIZED BY THE COUNTY INSPECTOR AND ALL CONSTRUCTION ACTIVITIES ARE COMPLETED, RESTORE STAGING AND ACCESS AREAS TO ACCEPTABLE (PRE -CONSTRUCTION) CONDITIONS, INSTALL LANDSCAPE PLAN PLANTINGS, AND REMOVE ALL OTHER EROSION CONTROL MEASURES. E&SC MEASURES CE CONSTRUCTION ENTRANCE E&SC STD. 3.02 T$ TEMPORARY SEEDING E&SC STD. 3.31 SF SILT FENCE E&SC STD. 3.06 Sl PERMANENT SEEDING E&SC STD. 3.32 IP INLET PROTECTION E&SC STD. 3.07 ® $O SODDING E&SC STD. 3.33 CIP CULVERT INLET PROTECTION E&SC STD.3.08 ® MULCHING E&SC STD. 3.35 DD DIVERSION DIKE E&SC STD. 3.09 -DDDD- STABILIZATION MATTING ES&C STD. 3.36 ST TEMP. SEDIMENT TRAP E&SC STD. 3.13 TP TREE PROTECTION E&SC STD. 338 Tp OP OUTLET PROTECTION E&SC STD. 3.18 DC DUST CONTROL E&SC STD. 3.39 TO TOPSOILING E&SC STD. 3.30 SOILS INFO: SOILS GROUP12D - CATOCTIN SILT LOAM, 15 TO 25%SLOPES SOILS GROUP 23C -YADKIN CLAY LOAM, 7 TO 15%SLOPES SOILS GROUP 71 B - RABUN CLAY LOAM, 2 TO 7%SLOPES I i cununvv uv�n I J RAILROAD NOTE TP TMP 780' RIGHT OF WAY FOR RAILROAD IS PER DB 274-70 AND THE N I ANTEC PARTNERSHIP TREE PROTECTION RIGHT OF WAY AND TRACK MAP FOR THE THESAPEAKE AND 1 STORYMETAL WAREHOUSE FENCING AT DB 854-1 16 OHIO RAILWAY COMPANY DATED DUNE 3 , 1916, AND LAST END OF STATE #1822BROA EET PARCEL A REVISED JULY 17, 1978. THIS CONFLICTS H FIELD PROJECT LIMITS #1820BROADWAYSTREET MAINTENANCE SIGN MONUMENTATION AND P TS OF RECQFJD FOR THE SUBJECT MANAGED STEEP DB 693-352 PLAT 1 STORYMETAL WAREHOUSE - -J AND ADJACENT PROPERT CONIC. WALL MAX. HT. SLOPES, TYP. I'LI ZONING) Q / C TMP 77-40A , I 84.00TW 84.00TW 86.00TW f00B TW 89.00TW BROADWAY CENTER LLC I 81.50BW 81.50BW 83.00BW $62SBw- ELFG�ZIx- DB 4436-471 I _ _ _ 5 (8)4"TO6"ARBORVITAEI'LI ZONING) I - 10" HC E LIMITS OF / I�� DISTURBANCE, TYP. IP 28"HI°KOR - (7 NLTT PR TECTI (1.0 ACRE) \ - I ao / O50"/ MAPLE I / 4,- MA,JE �I' POPLAR I� _I I I _ SILT FEN E \ � - i J °�y\ _ \ _-_� - \ -_ I - - 0 WHICKORY g HI CS L / J / / / / /T'ASH SF I -- - - -- �r I , �I J \ \ LAWN Trrpp� EESAPLI GS I l TFREE I I I / 0-4 373� Pt�TECTITP I/ /IDROP I LET �N I IP OTECTIO� IP DC 89.00 I n I I I I I I I I O3�"SPRUCEI UG-SWM O/ 85. r I I I SYSTEM I I - � 11 1 I 2IMAGNOLIA I I l I I •l 1/R ll/ I /1! I I Osseo PORCH I I I I I I I / Q / / I - I I I I I I I 30' MULBBRRY 89.00 vV -_ csw- 11 I / / J i I� 86. I I I I /___� I -_r=-- 1 I I /o I � \ - - BR/CK WALE - _ - � � / 46TI6PLAR ill X �- O l l l2-STY.�IIIIIII I=-/---�-- Hill HHST GING AREA I I o N W/ \ 20' VEPCO ESM'i. lian/ i - - BR%C SWi1LEt -1 - f r -I I DB 564-50 (PRIVATE) \ TO hSO 20'CENTRAL TELEPHONE iIII IIIIIIIII Oe I - J hT I I RAiN zus 1 I I / / / l ¢ / COMPANY OF VA. ESMT. / -W W�W �V� \ --- waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 LTH OF vt� �r . r V y Alan G. Franklin Lic. No. 35326 .0 10-12-2022 <v. �`rIONAL ti�G~ professional seal EUGENE RYANG project manager ALAN FRANKLIN project team I I \ DB 628-485 (PRIVATE) 1J csw /R\G� MAR H A N TI9o.r9"CD UGSS 0 2:1 SLOPE/ LIproject name SYTM FFIw VACS DJ ISFS OF URBANCICo%wA« 1 2. (1. ACRE) WNPAVED CONSTRUCTION\WHICK SSMH ENTRANCE //O/ 10, VA PACIFIC INVESTMENTS LLC TOP=372.9' OHtlNf O $ client SSMH S \ \ P / �JJ/// /� / 1 �J c, soR°'W 2088 UNION STREET, SUITE 1 BO WOOD SIrT FEN E I IN ER DID II I �y Co / / SF / l ~ o/ DB542-59PLAT SAN FRANCISCO, CA 9413 i0P376.36 S \ N \ � IN TPROT C I / 391 / V Co� / / 9"HK INV. IN364.2 (10" PVC) \ T (/ / / ENCH RK#Z / /� _/ / 2 AGNOUA / l/ 3� / / DB700/7 PLAT project address TM P 78-21 B INV. IN 368.1 (8" DROP) S CIO \ G� ��` 3 .5/61 WOOLEN MILLS, LLC INV. IN364.2 DB335-136PLAT DB 5000-249 INV.OUT364.0'110"PVC) 1 / -L / V y J I LL / MANAG,eu STEEP / / o� / \\�\E W P02022-00022 COMCASTBOXTOBE 378 SLOP TYP. y project number DB 841-429 PLAT --_ I / / i N P LOCATED 1 1 dl \ \ / w / % / / / 5' PE 8"C R i O / 0� (LI ZONING) \ LTI. H q0 / e � / lR �t OCIP CUL RTINLET \ ° L „ ,or T -7 YE J R\G/ WPO/VSMP PROTECTION �l 1 1 1 � - CHIMNEY 0' HU E O I T CHU INV=374.8' I \ \ 24 a o --- F SF t1m4 SF j N F / /5/ / /// / f / / T / project phase -I SSMH n \� a / �- ONV IAt\ 9�e FSG i0P 376.26' \ \ u� T, Q � � - - - p �`i 11 / INV. IN364.9' ? U' C �� / / �6 �L'p C� „�G ossco I / / 1 GJP�� 9y�FF / MAY to 2022 \ �,P V b ssco / I issue date INV. OUT364.4' \ ONU �P R. LrMA/N�PPRQX/ / \ p1E) EDGE PAV9. TOP 374.31' N I I SDMH TR TON O \ -W -W3 8 T P 8 LP A WA / . CRO _ P EUSSR \ / - INV. IN 372.3' 1 I 1 \ Cx c / INV. OUT72.3' ' \. \ -y� H -wJ 4" M PLE SNA STREETCLOSED / -RWS,A• 0JEORCEMA/N(VgJ JWB� - \ B 3 pOUTLET ION O / \ S SM W \ I \ 8"MADIP o )II VE`' / 3 \ / BEKCHMARKTl7 (SILT FENCE 11'DOE6 I p / MANAGED STEEP s� �\ \ c _ /� \- I 1 - - O SLOPES, TYP. fCA\ \� _ F �W�/ S �C cor R/GHI�OFWAYUNE 1 c lRF -370 h- ` / GRAVEL P RK/NG \ TOP 389.73' I 2'x3' GRATE INLET \ FH / \ � INV. IN385.7' (8"iCP) N.W. � I S 1. 12.03.2021 -ELIMINATE OFF -SITE IMPROVEMENTS TOP=375.8' SILT FEN E� G\Q I S� _ / INV. IN386.2' (8"iCP) NORTH TMP 78 21Q " 6 a _ 1, revisions INV.=374.8' /j INV. OUT 384.5'(8"iCP) SYLVESTER LAWRENCE, JR. & 8"pIPWATER �p - / a (MANHOLE DRY) WARREN L. HERRING o O AOS ESN � Z S� 5 �/ ( w I GARAGE-9STORY DB621507 BROADWAYSi. (END) �C � _ N � to MARCHANTSi(BEGIN) S S�0 �\ - PARCEL "E" 568 DB 4 PLAT I� 5 2 ( / �LI ZONING) /I ' EROSION CONTROL / LIMITS OF TMP 78-21 P DISTURBANCE, TYP. PLAN -STAGE B WATERLINE SEWER EASEMENTS I �c� ALFRED B. SADTLER (1.0 ACRE) sheet title WATERL197,20PLATDB 4278-469 (P BLIC) 7, M PLAT I LOT 6, BLOCK A (PUBLIC) SSMH DB 338-308 PLAT INV.TOP IN .42' / DB 1579-591 PLAT / / NV. N 371.4' (10" TCP1 / 0 10' 20' 40' INV. IN 372.4' (4"CIP) (LI ZONING) INV. OUT 371.2' (10" iCP) I EC 1 04 sheet number DRAINAGE SWALE DIRECTS FLOW TO SEDIMENT BASIN 70' MIN. 3" SM-2A ASPHALT TOP COURSE DIVERSION DITCH) A< 1 SIDE ELEVATION EXISTING GROUND 70' MIN. i ASPHALT PAVED WASHRACK /2% 12' MIN. DIVERSION DITCH MIN. J POSITIVE DRAINAGE WIDTH AT DESIGN WATER TO SEDIMENT ELEVATION IS 4.0' 1 TRAPPING DEVICE PLAN VIEW MUST EXTEND FULL WIDTH OF INGRESS AND EGRESS OPERATION EXISTING PAVEMENT 6" VDOT#21A AGGREGATE BASE MIN. EXISTING PAVEMENT r ,N. SET 1J12" WATER HYDRANT WITH FROST PROOF HYDRANT 3' ABOVE GRADE AND 4' OFF EDGE OF PAVEMENT -- -- -- -- -- 1 ill kkq LEI ACCEPTABLE TEMPORARY SEEDING PLANT MATERIALS QUICK REFERENCE FOR ALL REGIONS RATE PLANTING DATES SPECIES (LBS/ACRE) SEPT. 1- FEB. 15 50/50 MIX OF ANNUAL RYEGRASS & CEREAL WINTER RYE 50-100 FEB. 16 - APR. 30 ANNUAL RYEGRASS 60-100 MAY 1 - AUG. 31 GERMAN MILLET 50 TEMPORARY SEEDING .A.A.A0-ARCHIVE\Region TenkCADk04 Details\Pages from Chapter 3 - 3.32.jpg PERMANENT SEEDING RUNOFF WATER WITH SEDIMEr S DRIP SNOV BOAR SPECIFIC APPLICATION THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE HEAVY FLOWS ARE EXPECTED AND WHERE AN OVERFLOW CAPACITY IS NECESSARY TO PREVENT EXCESSIVE PONDING AROUND THE STRUCTURE. * GRAVEL SHALL BE VDOT #3, #357 OR #5 COARSE AGGREGATE. DROP INLET PROTECTION SOURCE: VA. DSWC T 1 1 18" mlin. i i i i i i i i i 1 PLATE 3.09-1 acted Soil Flow t�4.5' min.�l TEMPORARY DIVERSION DIKE 4CE **USE PLASTIC FENCING FOR TREE PROTECTION PLASTIC FENCING SHALL BE 40 INCH HIGH "INTERNATIONAL ORANGE" PLASTIC (POLYETHYLENE) WEB FENCING SECURED TO CONVENTIONAL 60-INCH TALL METAL "T" OR "U" POSTS DRIVEN TO A MINIMUM DEPTH OF 18 INCHES ON 6-FOOT MINIMUM CENTERS. THE FENCING SHALL BE INSTALLED AT THE LIMITS OF CLEARING. THE FENCE SHOULD HAVE THE FOLLOWING MINIMUM PHYSICAL QUALITIES: • TENSILE YIELD: AVERAGE 2,000 LBS PER 4-FOOT WIDTH (ASTM D638) • ULTIMATE TENSILE YIELD: AVERAGE 2,900 LBS PER 4-FOOT WIDTH (ASTM D638) • ELONGATION AT BREAK (%): GREATER THAN 1000% (ASTM D638) • CHEMICAL RESISTANCE: INERT TO MOST CHEMICAL AND ACIDS ANCHOR SLOT NOTES APPROXIMATELY 200 STAPLES REQUIRED PER 100 SQ. YDS. OF MATERIAL ROLL. ANCHOR SLOTS, JUNCTION SLOTS & CHECK SLOTS TO BE BURIED 6" TO 12". 12" MAX. 4:1 OR FLATTER 6" MAX. STEEPER THAN 4:1 EDGE AND END JOINTS 4f* TO BE SNUGLY ABUTTED JUNCTION SLOT (JUTE MESH WILL HAVE CHECK SLOT* STAPLED LAP JOINT IN LIEU OF EDGE JOINT) TERMINAL FOLD �I LAP JOINT 2" MIN. 5' MAX. 4:1 OR FLATTER I (JUTE MESH ONLY) 3' MAX. STEEPER THAN 4:1 ��I —TAMP FIRMLY I ANCHOR SLOT I I =m- - -m m-m- 2^ IR RIRII =m=R =m=m=m=m m==m=m=m=m= =m=R =m-m-m-m m- -m-m m=m= =m=R *CHECK SLOT . T-m- =m-R I I I I Co - - 2" ,,, T^ ^„ 7IV lur—�' v L I I I I I I I I I I TAMP CHECK SLOT FIRMLY z VAR. VAR. NDo_ III III-IIIdIJI PLAN VIEW o STAPLING DIAGRAM *CHECK SLOTS AT MIN. STAPLE FORMED FROM NO. 11 STEEL WIRE. 50' C-C INTERVALS; 8" STAPLE MIN. LENGTH FOR SANDY SOIL. NOT REQ.'D WITH ALL JUNCTION SLOT 6" STAPLE MIN. LENGTH FOR OTHER SOIL. "COMBINATION" BLANKETS 1711 TAMP TERMINAL FOLD 4" TAMP FIRMLY 1,7 2" SOIL STABILIZATION BLANKET TYPICAL TREATMENT - 1 INSTALLATION CRITERIA TREE PROTECTION CLASS Al RIP RAP — (BROWN RIVERSTONE OR LUCK CHALET) A .N�..• :ail! �i`J�•:� �� �L�i SECTION A -A FILTER CLOTH KEY IN 6%9'; RECOMMENDED FOR ENTIRE PERIMETER OUTLET PROTECTION SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control, Sherwood & Wyant PLATE. 3.05-1 1. SET POSTS AND EXCAVATE A 4"X4" 2. STAPLE WIRE FENCING TO THE POSTS. TRENCH UPSLOPE ALONG THE LINE OF POSTS. I � 1 1 FLOW a" 3. ATTACH THE FILTER FABRIC TO THE WIRE 4. BACKFILL AND COMPACT THE FENCE AND EXTEND IT INTO THE TRENCH. EXCAVATED SOIL. FLOW EXTENSION OF FABRIC AND WIRE INTO THE TRENCH. CONSTRUCTION OF A SILT FENCE Drainage Area (acres) (<3) 0.6 Ac. Trap Volumes: CREST OF STONE WEIR Elevation (ft) Area (so Volume (cy) 378 626 0 - 379 806 27 DRY STORAGE N VPRIBI£ 380 992 60 381 1358 103 382 1753 161 ME STORAGE �, u•IL (D(GM1FD> PLTCF CLOTH _V TOM -WE %AIE ].1}t CMRSE *G41iEC.LiE— CU55 [ RpMP Wet Storage Wet Storage Required (cy) (67*DA) 40.2 Bottom of stone weir (ft) 379.5 Wet Storage Provided at this Eelevation (cy) 45.0 Slope of Wet Storage Sides 1:1 Weir Length (ft) (6xDA) 3.6 Dry Storage: Bottom of Trap Elevation (ft) 378 Dry Storage Required (cy) (67*13A) 402 Bottom Trap Dimensions: irregular Crest of Stone Weir 381.0 Top of Dam Elevation (ft) 382 Dry Storage Provided at this Elevation (cy) 58.0 Top Width of Dam (ft) 4 Slope of Dry Storage Sides 21 Top Trap Dimensions irregular SEDIMENT TRAP 175 _F 7 150 125 Y U 100 w i 75 0 50 25 0 377 378 379 380 381 ELEVATION (FT) 382 383 GROUND ELEV. 4' "DRY" ELEV. 381.00 67 C.V./ AC. 2.5' N "DRY"STORAGE 58 CUBIC YARDS "WET" ELEV. 379.50 =. ORIGINAI GROUND 67 C.Y./ AC. ELEV. "WET"STORAGE 45 CUBIC YARDS (EXCAVATED) CLASS=RIPRAP FILTER CLOTH BOTTOM ELEV. 378.00 * SEE PLATE 3.13-1 COARSE AGGREGATE CROSS SECTION OF OUTLET CLASS I RIPRAP 4' STONE WEIR gggle INV. ELEV.379.50 -�_. CREST ELEV. 381.00 4' WIDE DIVERSION BERM ELEV. 382.00 1�7�C�OARSrAGGREGATE 1 // EXCAVATED FILTER CLOTH AREA �� COARSE AGGREGATE SHALL BE VDOT #3. #357 OR #5 OUTLET (PERSPECTIVE VIEW) TEMPORARY SEDIMENT TRAP waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions EROSION CONTROL DETAILS sheet title (WITH WIRE SUPPORT) EC105 sheet number SITE WALLS GENERAL STRUCTURAL NOTES GENERAUBUILDING CODE ALL WORK SHALL BE PERFORMED IN ACCORDANCE WITH THE 2018 VIRGINIA CONSTRUCTION CODE, PART 1 OF THE VIRGINIA UNIFORM STATEWIDE BUILDING CODE (VUSBC), EFFECTIVE JULY 1, 2021. DESIGN LOADS WALL DESIGN EARTH PRESSURES (EQUIVALENT FLUID PRESSURES) ARE AS FOLLOWS: CRUSHED STONE BACKFILL ACTIVE PRESSURE 32 PCF PASSIVE 250 PCF FRICTION COEFFICIENT FOR SLIDING 0.35 FOUNDATIONS FOUNDATIONS FOR RETAINING WALLS ARE SPREAD FOOTINGS BEARING ON EITHER NATURAL SOIL OR ENGINEERED COMPACTED FILL WITH AN ASSUMED SOIL BEARING CAPACITY OF 2,000 PSF. CONCRETE ALL CONCRETE WORK SHALL CONFORM TO ALL REQUIREMENTS OF ACI 301-08 "SPECIFICATIONS FOR STRUCTURAL CONCRETE" AND ACI 318-05 "BUILDING CODE REQUIREMENTS FOR STRUCTURAL CONCRETE". f'c=3,000 PSI (FOOTINGS) ASTM A615 GRADE 60 (TYPICAL REINFORCING STEEL) 3/4" X 3/4" VEE GROOVE JOINT EACH FACE CUT ALTERNATE HORIZ BARS AT JOINT EARTH FACE PLACE CONTROL JOINTS AT 20'-0" MAX OC WALL CONTROL JOINT NO SCALE CONCRETE SITE WALL SCHEDULE DIMENSIONS REINFORCING Hw "W" "L" BARS "0" BARS 0'-0" - 4'-0" 2'4" (2) - #5 #5 @ 18" 4'-0" - 6'-0" 3'4" (3) - #5 #5 @ 18" 4" DIA PERFORATED DRAIN ENCASED IN #5 CRUSHED STONE WRAPPED IN FILTER FABRIC. DRAIN TO SUITABLE OUTLET 3/4" CHAMFER, TYP ---------- \ "0" BARS #57 STON 7 BACKFILL 1-1y 2 \ I \ �u "L" BARS CONT RAILING BY OTHERS II a..; #4 AT 12" (HORIZ) (LAP V-10") 8" 8" CONC „W„ ELT H pF k, o Stephen D. Barber Lic. No. 025731 �pOS— sSfONAL 0�Y TYPICAL CONCRETE SITE WALL SECTION 3/4" = V-0" N 0 rn N N Z 0 rr w z 1.— LU LU J LU J cn LU o O = J o TQ T y r U MARCHANT PAVILION RETAINING WALL PROJECT No.: 2204-15 ISSUE DATE: 8/16/2022 CONCRETE RETAINING WALLS SK=1 waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions EROSION CONTROL DETAILS sheet title EC106 sheet number [ I I ANT EC PARTNERSHIP I #1820BROADWAYSTREET I 1 II [ DB 854-116 1 STORY METAL WAREHOUSE 1 STORY METAL WAREHOUSE PARCEL A J x� H w o #1822 BROADWAY STREET DB 693 352 PLAT Q ' O m END OF STATE MAINTENANCE SIGN (LI ZONING) K? o 1i - ',;z '�- ,," ,�.,_ (8i 4" i0 6"ARBORVITAE -` 5 k t k ' X "HKBR 10"CHE PRE-DEV. WATERSHED TO OUTFALL 1 N / 7 C. / z8°HICKORY - / ` (SHEET FLOW TO WOOLEN MILLS) I D.A. = 3,534 SF 1 1 1 \ / \ i ENE / 0561MAPLE CN = 95 \ I ( I �\ \ - - / / I / / / I I 4„MA�E g �j -_ \ O ITYGAS `AP R�X.) I U/C \ Tc - 5 Min. \ i �C C / � G G / / / / I O'POPLA� Tc PATH \ III u/C / / JI EDGE PA 7. J I'CDj \ ; ;. I PRE-DEV. WATE�2SH D TO I O 28"HICKORY HVAC's / �( 1� / D OI)TFALL 2-(T2" CM "�I I \69 /. Iz / D.A.HVAC 38,�46 SF l ' I / GM'S ® LAWN/ 4-F TT EESAPLIE,IGS D. I I I l y l OUTFALL 1 N CtLAWN ° I (SHEET FLOW TO WOOLEN MILLS) Z / I / / : / Tc 5.4 Mtn. o3�"SPRUCE( I waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8i77 Charlottesville, VA 22902 �O��PLTH OF' vt� �r . r c v Alan G. Franklin Lic. No. 35326 .0 10-21-2022 . ONAL ICSW OUTFALL 3 (SHEET FLOW TO RR) Q1(PRE) = 0.21 CFS RV1(PRE) = 428 CF 2000 MARCHANT Q2(PRE) = 0.30 CFS Q1O(PRE) = 0.61 CFS project name VA PACIFIC INVESTMENTS LLC 0 10' 20' 40' client �Z6p6MMMMNMMM=M�2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.22.2022 - FINAL SITE PLAN REVIEW COMMENTS revisions PRE -DEVELOPMENT D.A. MAP sheet title SW100 sheet number RAILROAD NOTE FHA 11450 POST-DEV. WATERSHED 2 TO S W M TMP 77-40E WRIGHT OF WAY FOR RAILROAD IS PER DB 274-70 AND THE RIGHT OF WAY AND N (Q. = 2,521 GPM) (18" STO RMTAN K) ANTEC PARTNERSHIP TRACK MAP FOR THE CHESAPEAKE AND OHIO RAILWAY OMPANY DATED JUNE END OF STATE D.A. = 27,809 SF /STORYMETAL WAREHOUSE DB 854-116 30, 1916, AND LAST REVISED JULY 17, 1978, THIS CONFLI S (LIZONINGJ WITH FIELD MAINTENANCE SIGN ROADWAYSTR PARCEL A MONUMENTATION AND PLATS OF RECORD FOR THE $U CT AND ADJACENT RV1)POST) = 2,479 CF #1820BROADWAYST,PEET PROPERTIES. DB 693-352 PLAT 1 STORYMETAL WAREHOUSE — CN = 78 (1-YR) STORM/BMP " CN = 79 (10-YR) EASEMENT, TYP. TMP 77-40A Tc = 5.0 Min. BROADWAY CENTER LLC j o _ DB 4436-471 I — — —_ _— _ — _— _ — -- — _ _ — _— —s —sao _-C-ifAlNLiroKF (Li ZONING) I /Pf W-- POST-DEV. WATERSHED TO OUTFALL 1 (SHEET FLOW TO WOOLEN MILLS) / D.A. = 6,224 SF �� S RMWATER/ MP w \ U C=AREAUN�DER I _M INTENANCE 1 1 CN = 95 STORfv1W TER/B / C NSTRU�iIONFORINSTAL ONO I Tc = 5 Min. \ I� EA WMENT I w I I A MAINTENANCE EA T r- — —�o ARrsLULPTURE,TYP. / N AROUNIJ\,PERkT OF U/C S ATERSHEIJ/D.A. 0 / Tc PATH -� - I PERIMEABLE`PAVE E T I — — — (P MEABLE PPP�VEN= 1) / PARKING AREAS CN 81 I �� I Vacs \ VR DJU TED CN 77 (y-YR)/ \ VRR JU TED C [,a't9v(l 0-YR)� STORM/BMP HVAc® A OUTFALL 1 I EASEMENT, TYP. (SHEET FLOW TO WO�L�N MILLS) I / /N KAING DEN R ABLE PA EMENT I C I I l I I I I SUB-WAT�SHEDID.A. � I I I Q1(Posr) = 0.58 CFS I IN I I 18'I TORtv1TA V K Tc PATH / (R INGAR EN 1) BD RV1 PosT = 1,264 CF I I I CN 75 I I LRs I '_� °uco PORCH VRRM ADJ ST CN — 72 (} YR) ' / 0 I I I L— J csw I I VRRM AD ST CN 73 (10-YR)I Qlo(Posr) = 1 .l 1 CFS 1 I / I I N — _ BR/CK WALE PAVE NII .3 — ... — ... —PERM22 _ -...—...—...—.I. — 11 O is I NT / 2-STY. /BSMT. n a FFE l esMT.+ / BRIC SWALE L J / / - e RALN lase SUB SHE D.A. C w w v w di t csw CNRM AB E PEMNT 1) ib \ d co wA« // / J ` vncs �I I VRRRM ADJ�ST�D CN = 8/1/(1 OYfR)R) / O � XC'o OF� 7r 70 I LawN �Yb �f�Y / ��J �lll� lIT o 0NESIINf I I 0/ / /� �// I �17 50'RO.W. s T PATH - y Tc AT�I %�`� � � � � � PST-qF,J�/. AT ED / � ��� � � � / D9342-193PLAr \S \ \ I (SAL CONC.) -� 391 j �/ /BEN A K#2 \O FAL 3 / ° /// / O9542-568PLAT � /- / �(SR1FLED TO R) DBIGb7-SOBPLAT o _ \ D9335-135PLAT OUTFALL 2 (12" CMP) Q1(POST) = 0.33 CFS 1 \ RV=2470+148CF=0A)7CF \ — CH391' D.f�� �,181 '3 Tc = �.o Min IRS / G�� Off/ 1(POST) Q10(POST) = 2.91 CFS 1 N \\\ I d! s� \ CHIMN \ ��1-IU /O � �-/- OHU TMP 78-216 WOOLEN MILLS, LLC N _..._ �6\�\ao ION ° l G�P�"1VV \ oqP�o�gPFF \ AGEDTEEP / DB 5000-249 ES, / waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 �o��PLTH OF vt� �r . r � v Alan G. Franklin Lic. No. 35326 0 10-21-2022 . �`rIONAL ti��~ professional seal EUGENE RYANG project manager ALAN FRANKLIN project team DB 841-429 PLAT 01 \ EDGEPAV7. (LI ZONING) y� wit W� S \ \ \ I STREETCLOSED —NJ —Wj —WJ —WI —VN —ir \ N S I ¢ O �I I �E� VEL I G � \ � \ � \ \ � Tc�A 1H1 I \ � � I � �d W S P�KNG\ �SUB-WATERSHED D—.A. D I GH Of WAY�LINE c/ O lRf STORMWRAADTLE/BMP' \ \ (DIRECT TO STORMTANK) �) S MAINTE \ENAN 2,789 SF @ CN = 98 TMP7821Q "� a� IW OUTFACE 3 SYLVESTER LAWRENCE, JR. & / 2000 M A R C H A N T EASEtvtENT � / 573SF @ CN = 61 � oo � FHA10426 (SHEET FLOW TO RR) \�S t EDGEGRAV — WARREN L. HERRING qz�I� / / )Qm= 2,178 GPM GARAG1 project name EZN / S E-1 STORY DB 621 507 W N I ° Q 1(POST) = 0.41 CFS PARCEL"E" a IW / RV1(POST) = 856 CF VA PACIFIC INVESTMENTS LLC BROADWAYST. (END) \ \ - DB 542-568 PLAT / Q10(POST) = 0.87 CFS client �� POST-DEV. WATERSHED 2 - - (LIZONING) 11 MARCHANTSi(BEGIN) I / / 2088 UNION STREET, SUITE 1 \ � �� (NO SWM) HATCHED AREA — — � — — L -` — / SAN FRANCISCO, CA 9413 TMP 78-2IF D.A. = 8,371 SF project address mac- ALFRED B. SADTLERV1 (PRE)= 326 CIF / 0 10' 20' 40' 1 DB4278-469 CN = 67 / LOT6, BLOCK Tc = 5.0 Min. 7 6%mmm%mmmmm� �- - _-- - - W P02022-00022 STORMWATER MANAGEMENT QUANTITY CALCULATIONS project number VSMP CHANNEL PROTECTION CRITERIA & FLOOD PROTECTION NARRATIVE VSMP CHANNEL PROTECTION CRITERIA WPO/VSMP This re -development project creates an increase of impervious cover and subsequently an increase in project phase runoff volume and peak flow from the development site to three existing outfalls (1, 2,& 3). At Outfalls OUTFACE 1 & OUTFACE 3 land 3, the runoff/volume increase is minor and is addressed b maintaining the runoff as sheet flow that The proposed development conditions will create increased volumes of sheet flow at Outfall 1 and v g MAY 19, 2022 Outfall 2 as identified on the plan. It is the opinion of the Engineer of Record that this increased volume in opinion of the Engineer of Record will not cause or contribute to erosion, sedimentation, or flooding of issue date down gradient properties or resources and that no further water quantity controls are required per of sheet flow will not cause or contribute to erosion, sedimentation, or flooding of down gradient 9VAC25-870-66(D). To address the increased runoff volume and peak flow at Outfall 2, the two parking properties or resources and that no further water quantity controls are required per 9VAC25-870-66(D). lots will be constructed of permeable pavers, a rain garden will be constructed to help attenuate runoff OUTFALL2 from building roofs, and an underground stormwater detention system are proposed. A majority of the per 9VAC25-870-66 (B) (3) proposed development stormwater will be routed to the underground detention system and released to an existing 12" CMP under Marchant Street (Outfall 2) as required by 9VAC25-870-66(B) & (C). Q1(Allowable) _ [I.F. x (Q1(Pre) x RV1 (Pre))/RV1 (Post)] In order to satisfy the TP Load Reduction requirements for this re -development activity, the two on -site I.F. = 0.9 (Less than 1 Acre) Q1(Pre) = 0.69 cfs parking bays will be constructed of permeable concrete interlocking pavement (Permeable Pavement - RV1(Pre) = 1,623 cf Level 1) and a rain garden (Rain Garden # 1) will also be constructed. Additionally, nutrient credits RV1(Post) = 2,479 + 326 = 2,805 cf purchased from an approved Nutrient Bank will also be required because the proposed WQ BMPs do Q1(Allowable) = [0.9 x (0.69 x 1,623/2,805)] = 0.36 cfs not remove the entire required TP load reduction. Q1(Post)= 0.29 cfs < Q(1)Allowable= 0.36 cfs (CRITERIA MET) FLOOD PROTECTION CRITERIA OUTFALL 1 & OUTFALL 3 Satisfied per 9VAC25-870-66(D) OUTFALL 2 per 9VAC25-870-66(C)(2) 01o(Post) = 2.95 cfs < Q1o(Pre) =3.10 cfs (CRITERIA MET) 1. 10.22.2022 - FINAL SITE PLAN REVIEW COMMENTS revisions POST -DEVELOPMENT D.A. MAP sheet title SW101 sheet number IC .. 0 ci) 2AS Po Dev 1 (sheet to Po -Dev 2 to SWM Woolen) 2P 3S 1L " StormTrap Post-Dev 3 (sh t to Outfall 3 (Sheet Flow to RR) RR) 3 L Outfall 3 (Sheet Flow to Outfall 2 (12" CMP) RR) Post-Dev 2 (no SWM) Drainage Diagram for Marchant-Post Subcat Reach Aon Link Prepared by {enter your company name here), Printed 5/4/2022 HydroCADO 9.10 sln 06424 @ 2010 HydroCAD Software Solutions LLC Summaryfor Subcatchment 3S: Post-Dev3 (sheet to RR) [49] Hint: Tc<2dt mayrequire smallerdt Runoff = 0.41 cfs @ 11.95 hrs, Volume= 856 cf, Depth> 1.98" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-Year Rainfall=3.00" 4,094 1,087 98 Unconnected pavement, HSG B 61 >75% Grass cover, Good, HSG B 5,181 90 Weighted Average 1,087 20.98% Pervious Area 4,094 79.02% Impervious Area 4,094 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (fdft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Link 1 L: Outfall 3 (Sheet Row to RR) Inflow Area = 6,224 sf, 93.06% Impervious, Inflow Depth> 2.44" for 1-Year event Inflow = 0.58 cfs @ 11.95 hrs, Volume= 1,264 cf Primary = 0.58 cfs @ 11.95 hrs, Volume= 1,264 cf, Men= 0%, Lag= 0.0 min Primaryoutflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Inflow Area = Inflow = Outflow = Primary = Summary for Subcatchment 2AS: Post-Dev2 to SWM (1yr) [49] Hint: Tc<2dt may require smaller dt Runoff = 1.22 cfs @ 11.96 hrs, Volume= 2,479 cf, Depth> 1.07" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-Year Rainfall=3.00" Area (sf) CN Description 8,958 78 DA-A (Adjusted CN from VRRM) 8,944 72 DA-B (Adjusted CN from VRRM) 6,545 81 DA-C (Adjusted CN from VRRM) 2,789 98 DA-D (Unconnected pavement, HSG B) 573 61 DA-D (>75% Grass cover, Good, HSG B) 27,809 78 Weighted Average, UI Adjusted CN = 77 25,020 89.97% Pervious Area 2,789 10.03% Impervious Area 2,789 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (tuft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Pond 2P:18" StormTrap 27,809 sf, 10.03% Impervious, Inflow Depth > 1.07" for 1-Year event 1.22 cfs @ 11.96 hrs, Volume= 2,479 cf 0.20 cfs @ 12.18 hrs, Volume= 2,373 cf, Atten= 84%, Lag=13.3 min 0.20 cfs @ 12.18 hrs, Volume= 2,373 cf Routing by Stor-Ind method, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 376.73' @ 12.18 hrs Surf.Area= 1,410 sf Storage= 895 cf Plug -Flow detention time= 75.6 min calculated for 2,373 cf (96% of inflow) Center -of -Mass det. time= 51.9 min (903.0 - 851.1 ) Volume Invert Avail.Storage Storage Description #1 376.00' 1,253 cf #57 travel + 12" on all sides (Irregular) Listed below (Recalc) 4,935 cf Overall -1,803 cf Embedded = 3,132 cf x 40.0% Voids #2 376.00' 1,722 cf 18" StormTank (Irregular) Listed below (Recalc) Inside #1 1,803 cf Overall x 95.5% Voids 2,975 cf Total Available Storage Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic -feet) (cubic -feet) (sq-ft) 376.00 1,410 212.0 0 0 1,410 379.50 1,410 212.0 4,935 4,935 2,152 Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic -feet) (cubic -feet) (sq-ft) 376.00 1,202 204.0 0 0 1,202 377.50 1,202 204.0 1,803 1,803 1,508 Device Routing Invert Ouflet Devices #1 Primary 376.00' 12.0" Round 12" HDPE L= 100.0' CPP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 376.00' / 375.00' S= 0.0100 'f Cc= 0.900 n= 0.012 #2 Device 1 376.00' 3.0" Vert. 3" PVC C= 0.600 #3 Device 1 376.69' 6.0" Vert. (3) - 6" PVC X 3.00 C= 0.600 PrimaryOutRow Max--0.20 cfs @ 12.18 hrs HW=376.73' (Free Discharge) L1=12" HDPE (Passes 0.20 cfs of 1.77 cfs potential flow) 12=3" PVC (Orifice Controls 0.18 cfs @ 3.73 fps) 3=(3) - 6" PVC (Orifice Controls 0.01 cfs @ 0.65 fps) Summaryfor Subcatchment 3S: Post-Dev 3 (sheet to RR) [49] Hint: Tc<2dt may require smaller dt Runoff = 0.41 cfs @ 11.95 hrs, Volume= 856 cf, Depth> 1.98" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-Year Rainfall=3.00" Area (sfl CN Descriotion 4,094 1,087 98 Unconnected pavement, HSG B 61 >75% Grass cover, Good, HSG B 5,181 90 Weighted Average 1,087 20.98% Pervious Area 4,094 79.02% Impervious Area 4,094 100.00% Unconnected To Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Link 3L: Outfall 3 (Sheet Row to RR) Inflow Area = 5,181 sf, 79.02% Impervious, Inflow Depth > 1.98" for 1-Year event Inflow = 0.41 cfs @ 11.95 hrs, Volume= 856 cf Primary = 0.41 cfs @ 11.95 hrs, Volume= 856 cf, Men= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Summary for Subcatchment 2BS: Post-Dev 2 (no SWM) [49] Hint: Tc<2dt may require smaller dt Runoff = 0.14 cfs @ 11.98 hrs, Volume= 326 cf, Depth> 0.47" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-Year Rainfall=3.00" Summary for Link 2L: Outfall 2 (12" CMP) Area (sf) CN Description Inflow Area = 36,180 sf, 11.42% Impervious, Inflow Depth > 0.90" for 1-Year event 0 98 Unconnected pavement, HSG B Inflow = 0.29 cfs @ 12.00 hrs, Volume= 2,700 cf 4,861 61 >75% Grass cover, Good, HSG B 1,344 98 Unconnected pavement, HSG B2,166 Primary = 0.29 cfs @ 12.00 hrs, Volume= 2,700 cf, Aften= 0%, Lag= 0.0 min 61 >75% Grass cover, Good, HSG B 8,371 67 Weighted Average, UI Adjusted CN = 64 Primaryoutflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs 7,027 83.94% Pervious Area 1,344 16.06% Impervious Area 1,344 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295 8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions STORMWATER MODEL (1 YR) sheet title SW 102 sheet number ICno0 ci) 2AS Po Dev 1 (sheet to Po -Dev 2 to SWM Woolen) 2P 3S 1L " StormTrap Post-Dev 3 (sh t to Outfall 3 (Sheet Flow to RR) RR) 3 L Outfall 3 (Sheet Flow to Outfall 2 (12" CMP) RR) Subcat Reach Aon Link a Post-Dev 2 (no SWM) Drainage Diagram for Marchant-Post Prepared by {enter your company name here), Printed 5/4/2022 HydroCAD® 9.10 s/n 06424 © 2010 HydroCAD Software Solutions LLC Summary for Subcatchment 1 S: Post-Dev 1 (sheet to Woolen) [49] Hint: Tc<2dt m ay requi re smaller dt Runoff = 1.11 cfs @ 11.95 hrs, Volume= 2,511 cf, Depth> 4.84" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.50" Area (sfl CN Descriotion 5,792 432 98 Unconnected pavement, HSG B 61 >75% Grass cover, Good, HSG B 6,224 95 Weighted Average 432 6.94% Pervious Area 5,792 93.06% Impervious Area 5,792 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Link 1 L: Outfall 3 (Sheet Flow to RR) Inflow Area = 6,224 sf, 93.06% Impervious, Inflow Depth > 4.84" for 10-Year event Inflow = 1.11 cfs @ 11.95 hrs, Volume= 2,511 cf Primary = 1.11 cfs @ 11.95 hrs, Volume= 2,511 cf, Atten= 0%, Lag= 0.0 min Primaryoutflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Inflow Area = Inflow = Outflow = Primary = Summary for Subcatchment 14S: Post-Dev2 to SWM (10yr) [49] Hint: Tc<2dt may require smaller dt Runoff = 3.57 cfs @ 11.96 hrs, Volume= 7,271 cf, Depth> 3.14" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.50" Area (so CN Description 8,958 79 DXA(Adjusted CN from VRRM) 8,944 73 DXB (Adjusted CN from VRRM) 6,545 82 DXC (Adjusted CN from VRRM) 2,782 98 Unconnected pavement, HSG B 573 61 >75% Grass cover, Good, HSG B 27,802 79 Weighted Average, UI Adjusted CN = 78 25,020 89.99% Pervious Area 2,782 10.01 % Impervious Area 2.782 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Pond 2P:18" StormTrap 27,802 sf, 10.01 % Impervious, Inflow Depth > 3.14" for 10-Year event 3.57 cfs @ 11.96 hrs, Volume= 7,271 cf 2.40 cfs @ 12.03 hrs, Volume= 7,101 cf, Atten= 33%, Lag=4.2 min 2.40 cfs @ 12.03 hrs, Volume= 7,101 cf Routing byStor-Ind method, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 377.50' @ 12.03 hrs Surt.Area= 1,410 sf Storage=1,844 cf Plug -Flow detention time=47.4 min calculated for7,101 cf(98%of inflow) Center-of-k1lass det. time= 33.6 min (852.0 - 818.3) Volume Invert Avail.Storage Storage Description #1 376.00' 1,253 cf #57 travel + 12" on all sides (Irregular) Listed below (Recalc) 4,935 cf Overall -1,803 cf Embedded = 3,132 cf x40.0%Voids #2 376.00' 1,722 cf 18" StormTank (Irregular) Listed below (Recalc) Inside #1 1,803 cf Overall x 95.5% Voids 2,975 cf Total Available Storage Elevation Surf.Area Perim. Inc.Store Cum.Store V\Iet.Area (feet) (sq-ft) (feet) (cubic -feet) (cubic -feet) (sq-ft) 376.00 1,410 212.0 0 0 1,410 379.50 1,410 212.0 4,935 4,935 2,152 Elevation Surf.Area Perim. Inc.Store Cum.Store V\Iet.Area (feet) (sq-ft) (feet) (cubic -feet) (cubic -feet) (sq-ft) 376.00 1,202 204.0 0 0 1,202 377.50 1,202 204.0 1,803 1,803 1,508 Device Routing Invert Outlet Devices #1 Primary 376.00' 12.0" Round 12" HDPE L= 100.0' CPP, square edge headwall, Ke= 0.500 Inlet / Ouflet Invert-- 376.00' / 375.00' S= 0.0100 'f Cc= 0.900 n= 0.012 #2 Device 1 376.00' 3.0" Vert. 3" PVC C= 0.600 #3 Device 1 376.69' 6.0" Vert. (3) - 6" PVC X 3.00 C= 0.600 Primary OutRow Max=2.36 cfs @ 12.03 hrs HVV=377.48' (Free Discharge) t1=12" HDPE (Passes 2.36 cfs of3.74 cis potential flow) 12=3" PVC (Orifice Controls 0.28 cfs @5.60 fps) 3=(3) - 6" PVC (Orifice Controls 2.08 cfs @ 3.54 fps) Summary for Link 2L: Outfall 2 (12" CMP) Inflow Area = 36,173 sf, 11.41 % Impervious, Inflow Depth > 2.80" for 10-Year event Inflow = 2.95 cfs @ 12.00 hrs, Volume= 8,435 cf Primary = 2.95 cfs @ 12.00 hrs, Volume= 8,435 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Summaryfor Subcatchment 3S: Post-Dev3 (sheet to RR) [49] Hint: Tc<2dt mayrequire smaller dt Runoff = 0.87 cfs @ 11.95 hrs, Volume= 1,876 cf, Depth> 4.35" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.50" Area (sfl CN Descriotion 4,094 1,087 98 Unconnected pavement, HSG B 61 >75% Grass cover, Good, HSG B 5,181 90 Weighted Average 1,087 20.98% Pervious Area 4,094 79.02% Impervious Area 4,094 100.00% Unconnected Inflow Area = Inflow = Primary = Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Link 3L: Outfall 3 (Sheet Flow to RR) 5,181 sf, 79.02% Impervious, Inflow Depth > 4.35" for 10-Year event 0.87 cfs @ 11.95 hrs, Volume= 1,876 cf 0.87 cfs @ 11.95 hrs, Volume= 1,876 cf, Atten= 0%, Lag= 0.0 min Primaryoutflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Summary for Subcatchment 2BS: Post-Dev 2 (no SWM) [49] Hint: Tc<2dt may require smaller dt Runoff = 0.66 cfs @ 11.96 hrs, Volume= 1,334 cf, Depth> 1.91" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.50" Area (sf) CN Descriotion 0 98 Unconnected pavement, HSG B 4,861 61 >75% Grass cover, Good, HSG B 1,344 98 Unconnected pavement, HSG B 2,166 61 >75% Grass cover, Good, HSG B 8,371 67 Weighted Average, UI Adjusted CN = 64 7,027 83.94% Pervious Area 1,344 16.06% Impervious Area 1,344 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295 8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions STORMWATER MODEL (1 OYR) sheet title SWI03 sheet number b SOIL 23C PRE -DEVELOPMENT MAP POST -DEVELOPMENT MAP i 0 15' 30' 60' 1- VRRM LAND USE KEY (PRE-DEV) ILIMITS OF DISTURBANCE 1.00 ACRES MANAGED TURF, HSG B 0.68 ACRES r ;'= IMPERVIOUS COVER, HSG B 0.32 ACRES 0 15' 30' 60' 1- VRRM LAND USE KEY (POST-DEV) ILIMITS OF DISTURBANCE 1.00 ACRES MANAGED TURF, HSG B 0.42 ACRES Y IMPERVIOUS COVER, HSG B 0.58 ACRES CALCULATIONS WATER QUALITY CONTROL In order to satisfy the TP Load Reduction requirements for this re -development activity, the two on -site parking bays will be constructed of permeable concrete interlocking pavement (Permeable Pavement - Level 1) and a rain garden (Rain Garden # 1) will also be constructed. Additionally, nutrient credits purchased from an approved Nutrient Bank will also be required because the proposed WQ BMPs do not remove the entire required TP load reduction. TP Load Reduction Required = 0.63 Ibs/yr The WQ plan is comprised of 3 sub -watersheds, DA A, DA B, and DA C on the VRRM spreadsheet (shown on subsequent sheet). Permeable Pavement - Level 1 for DA A Rain Garden #1 for DAB Permeable Pavement - Level 1 for DA C DA A Water Quality Volume TV = 368 cf (from D.A. "A" on the VRMM spreadsheet) Permeable Pavement A (Level 1) 3,347 sf of permeable paver on 12" stone reservoir layer w/ underdrain Volume available in stone reservoir = 3,347 cf x 0.40 = 1,339 cf TP Load Reduction Provided = 0.10 Ibs/yr DA B Water Quality Volume TV = 370 cf (from D.A. "B" on the VRMM spreadsheet) Micro-Bioretention Rain Garden (Leve 1) Surface Area Required CDA = 8,944 sf SARequired = 3% of contributing drainage area (CDA) = 0.03 x 8,944 = 268 sf SAProvided=268 sf TP Load Reduction Provided =0.10 Ibs/yr DA C Water Quality Volume Tv = 312 cf (from D.A. "C" on the VRMM spreadsheet) Permeable Pavement C (Level 1) 2,543 sf of permeable paver on 12" stone reservoir layer w/ underdrain Volume available in stone reservoir = 2,543 cf x 0.40 = 1,017 cf TP Load Reduction Provided = 0.08 Ibs/yr Total TP Load Reduction Provided = 0.10 + 0.10 + 0.08 = 0.28 Ibs/yr Nutrient Credit Purchase Required = 0.63 - 0.28 = 0.36 Ibs/yr (as shown on VRRM spreadsheet) ECOSYSTEM SERVICES, LLC 1739 Allied Street, Suite A Charlottesville, VA 22903 540.578.4296 www.ecosystemservices.us ion0mcosystemservices.us May 18, 2022 Alan Franklin, PE waterstreet studio 418 East Main Street Charlottesville, VA 22902 RE: Nutrient Offset Credit— Credit Availability Letter Project: 2000 Marchant Drive Project Address: 2000 Marchant Drive, Charlottesville, VA 22902 W Project HUC: 02090204 U Bank HUC: 02080204 Bank Address:1705 Lambs Road, Charlottesville, VA 22901 Dear Mr. Franklin, 1 We appreciate the opportunity to provide a credit availability letter for 0.50 pounds of phosphorus for 11 the above referenced project. This letter is to certify that as of today, May 18, 2022, Ivy Creek Nutrient 1,11 Bank has 171.08 pounds of phosphorus (TP), 263.26 pounds of nitrogen (TN), and 53,946.89 pounds f �',�! TSS available for transfer to those entities requiring offsets in accordarl'te with the Chesapeake B:y Watershed Nutrient Credit Exchange Prograll Code § 62.1-44.19:14 a Iseq.). Those offsets are also transferable in accordance with the Virginia stormwater oA Code § 62.1-44.15:35) and i the Virginia Soil and Water Conservation Board's Guidance Document on Stormwater Nonpoint Nutrient ' Offsets approved on July 23, 2009, to those regulated entities qualifying for nutrient credits. a0 We can certainl a ommodate your needs and could offer to fulfil,llthe order of 0.50 pounds of phosphorus. Please feel free to contact us with an questions. I hope we have the opportunity to work together on this �.� any p pp Y g +� f project. r° ro ail �,r��'u �8 •� t a� Sincerely, I� �� •� p°� ri,ti '1_ i ,zi V ��° y. i � cosystem Services LLC Eu o ,E° 1-'V B P ai�„1 q'-�'i 1i ° �,°�,PIa ���' vh _���``t�a���' I i[l� III I`1��, �''♦���� �' f��� �� �I b� '�. n Jonathan R. Roller, AOSE PISS CNMPt� i Manager Authorized Representative J waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 TH OF .v CO f r� Alan G. Franklin Lic. No. 35326 0 10-12-2022 W. �`rIONAL ti��~ professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions STORMWATER QUALITY MAP sheet title swi sheet number 04 Virginia Runoff Reduction Method Worksheet DEQ Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2011 Stds & Specs Site Summary Project Title: Marchant Date: 44663 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) Total Rainfall (in): 43 Total Disturbed Acreage: 1.00 A soils B Soils C Soils D Soils Totals % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.68 0.00 0.00 0.68 68 Impervious Cover (acres) 0.00 0.32 0.00 0.00 0.32 32 1.00 100 Post-ReDevelopment Land Cover (acres) A soils B Soils C Soils D Soils Totals % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.42 0.00 0.00 0.42 42 Impervious Cover (acres) 0.00 0.58 0.00 0.00 0.58 58 1.00 100 Site Tv and Land Cover Nutrient Loads Final Post -Development Post- Post- Adjusted Pre- (Post-ReDevelopment Development & New Impervious) ReDevelopment (New Impervious) ReDevelopment Site Rv 0.64 0.52 0.95 0.52 Treatment Volume (ft3) 2,305 1,408 897 1,408 TP Load (lb/yr) 1 1.45 1 0.88 1 0.56 1 0.88 Total TP Load Reduction Required (lb/yr) 0.63 0.18 0.46 Final Post -Development Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment TN Load (lb/yr) 10.36 7.18 Site Compliance Summary Maximum % Reduction Required Below Pre-ReDevelopment Load 20% Total Runoff Volume Reduction (ft) 328 Total TP Load Reduction Achieved (lb/yr) 0.27 Total TN Load Reduction Achieved (lb/yr) 2.07 Remaining Post Development TP Load (lb/yr) 1.18 Remaining TP Load Reduction (lb/yr) Required 0.36 Runoff Volume and CN Calculations 1-yearstorm 2-yearstorm 30-yearstorm Target Rainfall Event (in) 1 3.00 3.60 5.50 Pre- ReDevelopment FinalPost-Development Post-ReDevelopmentTP TP Load per acre TP Load per acre Load per acre (lb/acre/yr) (Ib/acre/yr) (Ib/acre/yr) 1.20 1.45 1.20 Drainage Areas RV & CN Drainage Area A Drainage Area B Drainage Area C Drainage Area D Drainage Area E CN 81 75 84 0 0 RR (ft3) 124 110 93 0 0 1-year return period RV wo RR (ws-in) 1.31 0.96 1.52 0.00 0.00 RV w RR (ws-in) 1.11 0.82 1.32 0.00 0.00 CN adjusted 78 72 81 0 0 2-year return period RV wo RR (ws-in) 1.79 1.37 2.02 0.00 0.00 RV w RR (ws-in) 1.59 1.23 1.83 0.00 0.00 CN adjusted 78 73 81 0 0 10-year return period RV wo RR (ws-in) 3.43 2.86 3.73 0.00 0.00 RV w RR (ws-in) 1 3.23 2.72 3.53 0.00 0.00 CN adjusted 79 73 82 1 0 0 Drainage Area Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf (acres) 0.08 0.13 0.05 0.00 0.00 0.26 Impervious Cover (acres) 0.09 0.08 0.08 0.00 0.00 0.25 Total Area (acres) 0.17 0.21 0.13 0.00 0.00 0.51 Drainage Area Compliance Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total TP Load Reduced (lb/yr) 0.10 0.10 0.08 0.00 0.00 0.27 TN Load Reduced(lb/yr) 0.73 0.79 0.55 0.00 0.00 2.07 Drainage Area A Summary Land Cover Summary A Soils B Soils C Soils D Soils Total % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.08 0.00 0.00 0.08 47 Impervious Cover (acres) 0.00 0.09 0.00 0.00 0.09 53 0.17 BMP Selections Managed Turf Impervious BMP Treatment TP Load from Untreated TP Load TP Removed TP Remaining Downstream Treatment Practice Credit Area Cover Credit a Volume (ft) Upstream to Practice (Ibs) (Ib/yr) (Ib/yr) to be Employed (acres) Area (acres) Practices (Ibs) 3.a. Permeable Pavement #1 (Spec #7) 0.08 275.88 0.00 0.17 0.10 0.07 Total Impervious Cover Treated (acres) 0.08 Total Turf Area Treated (acres) 0.00 Total TP Load Reduction Achieved in D.A. 0.10 (lb/yr) Total TN Load Reduction Achieved in D.A. 0.73 (lb/yr) 1 Drainage Area B Summary Land Cover Summary A Soils B Soils C Soils D Soils Total % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.13 0.00 0.00 0.13 62 Impervious Cover (acres) 0.00 0.08 0.00 0.00 0.08 38 0.21 BMP Selections Managed Turf Impervious BMP Treatment TP Load from Untreated TP Load TP Removed TP Remaining Downstream Treatment Practice Credit Area Cover Credit a Volume (ft) Upstream to Practice (Ibs) (Ib/yr) (Ib/yr) to be Employed (acres) Area (acres) Practices (Ibs) 2.f. To Rain Garden #1, M Micro-Bioretention #1 (Spec #9) 0.08 275.88 0.00 0.17 0.10 0.08 Total Impervious Cover Treated (acres) 0.08 Total Turf Area Treated (acres) 0.00 Total TP Load Reduction Achieved in D.A. (lb/yr) 0.10 Total TN Load Reduction Achieved in D.A. (Ib/yr) 0.79 Drainage Area C Summary Land Cover Summary A Soils B Soils C Soils D Soils Total % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.05 0.00 0.00 0.05 38 Impervious Cover (acres) 0.00 0.08 0.00 0.00 0.08 62 0.13 BMP Selections Managed Turf Impervious BMP Treatment TP Load from Untreated TP Load TP Removed TP Remaining Downstream Treatment Practice Credit Area Cover Credit a Volume (ft) Upstream to Practice (Ibs) (Ib/yr) (Ib/yr) to be Employed (acres) Area (acres) Practices (Ibs) 3.a. Permeable Pavement #1 (Spec #7) 0.06 206.91 0.00 0.13 0.08 0.05 Total Impervious Cover Treated (acres) 0.06 Total Turf Area Treated (acres) 0.00 Total TP Load Reduction Achieved in D.A. (lb/yr) 0.08 Total TN Load Reduction Achieved in D.A. (Ib/yr) 0.55 waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295 8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions VRRM SPREADSHEETS sheet title SWI05 sheet number T-0" (914 mm) p00000017 a000000q o ® 000 oo® 0D0a00oo0ooC D0000� 0o00 ooa a Q O O o 00 O °o O O °o Q 1'-6" o00 0000® ooa (457 mm) 1 D 0000 0000 0000 0000 a o � ®0000 000a ®�o�o 0000 ® � b 000000� a000000d E E r9 CD T TOP T w J m H w w J) 1 FRONT ISOMETRIC VIEW SIDE STORMTANK MODULES DESCRIPTION HEIGHT in. mm CAPACITY cf cu. m. NOMINAL VOID RATIO WEIGHT lbs. k ST-18 18 (457) 6.436 (0.18) 95.5% 22.7 (10) ST-30 30 (762) 10.876 (0.31) 96.5% 29.5 (13) ST-36 36 (914) 13.096 (0.37) 97.0% 33.1 (15) V-6" (457 mm) ma Dma Dma Dma D®a D® ma Dma Dma Dma Dma Dm On Lma Loa Loa Eon pm T®v oma oma oma omv omy ®a Dma Dma M Dma DO aDIDaDaDID 18" (457 mm) 1 \ STORMTRAP MODULE 1 '-6" r(457 mm) o E _I rn �LO v t 24" (610 mm) SIDE PANEL 1 '-6" (457 mm) ma Dma Dma Dma Dma Dm ma Dma Dma Dma D®a D® aDaDaDaDaD .-. ®a �ma p®a pma pma om s= ®° 7e 7,A °m° °,®a° °® a� a� a� a� `�'; aDaDaDaDaD ma LOA LOA Dma DEon a L® ®a Dma Dma Dma Dma Dm ma Dma Dma Dma D®a D® 30" (762 mm) SIDE PANEL o E CV 10 00 NOTES: 1. SIDE PANELS TO BE INSTALLED ALONG SYSTEM PERIMETER, UNLESS OTHERWISE SPECIFIED. 2. ALL HEIGHTS TO BE CUT FROM A 36" (914 mm) SIDE PANEL AT PRE -SCRIBED LOCATIONS. 3 1 STORMTRAP SIDE PANELS 1106 SCALE: NITS CONCRETE RING PORT KIT (DESIGNED BY OTHERS) BOX WITH LID RISER PIPE BRENTWOOD OBSERVATION PORT FLEXIBLE COUPLING 4 OBSERVATION PORT SW 106 SCALE : NITS 1'-6" (457 mm) *DIDaDaDID ma Dma Dma Dma Dma Dm A 0 A o a o A o a 17 ma Dma Dma Dma Dma Dm ma Dma Dma Dma Dma Dm 4 Dma D®a Dma D®a D® a7�®a ao®a pma � a7 aU�® �U,011 ®a ®a D®a D®a Dma Dma D® ®a D®a D®a D®a D®a D® ma LOA LOA Dma Dma Dm ®a Dma Dma Dma Dma Dm ma Dma Dma Dma Dma Dm 36" (914 mm) SIDE PANEL FINISHED IMPERVIOUS SURFACE (SEE PAVING SECTION DETAIL) SUITABLE COMPACTED FILL PROPEX GEOTEX 601 NON -WOVEN GEOTEXTILE (OR EQUAL) AND STONE/SOIL INTERFACE IMPERMEABLE LINER SURROUNDING MODULES VDOT #57 STONE CONTRACTOR RESPONSIBLE FOR ENSURING SUBGRADE SOILS MEET BEARING AND SETTLING REQUIREMENTS STEP 1: T-0" (914 mm) 1'-6" (457 mm) p000000o a000000q 0000 000a 0000 0000 �o®o oa000aoao0 o®a0 OD00OIIDO� °" 0OaDO0(11 1' 6" D o 0000 0 0 000o a 0 (457 mm) �0 0 o o 0 <> Q D 0 1 oDO0a C> OaDOOao 0°®0000° 0000°" 0 oa000 0000 c) 0000 o�o� ®�o10 o�o� a o 0 0 0 0 0 0 0 0 0 0 0 o d 9.. (229 mm) SEE TABLE A FOR OPENING SIZE TABLE A: OBSERVATION PORT DIMENSION PORT SIZE OPEN SIZE RISER PIPE DIA. 6" (152 mm) 7" (178 mm) 6" (152 ml 8" (203 mm) 9" (229 mm) 8" (203 ml 10" (254 mm) 11" (279 mm) 10" (254 ml LAYOUT & CUT OPENING INTO THE CENTER OF THE TOP PLATEN FOR BRENTWOOD OBSERVATION PORT. •X• A. CTl A - ru FLANGE PLATE MARK & CUT FLANGE PLATE FLUSH WITH MODULE SIDE "WHEN MODULE IS ON THE PERIMETER OF THE SYSTEM." \/C/—CT A TEE, ADCA %A/IT" A IATC JIVI\I VIIl11 VI\ MODULES 2 l STORMTRAP TYPICAL SECTION SW 106 I SCALE: NITS STACKING PIN (2 PLACES) STEP 2: PLACES) TION PORT :NT HOLES (2 -EN ALIGN PORT PLATE WITH TOP PANEL: INSERT TWO STORMTANK MODULE STACKING PINS INTO THE CIRCULAR RECESSES IN THE TOP PLATEN OF THE STORMTANK MODULE. INSERT THE SHORT SIDE OF THE PORT PIPE STUB INTO THE PLATEN ALIGNING THE PORT PLATE ALIGNMENT HOLES WITH THE STACKING PINS. CTPP R- NON-WOVEN GEOTEXTILE FABRIC (PROPEX GEOTEX 601 OR APPROVED EQUAL) INSTALL GEOTEXTILE: WRAP SPECIFIED GEOTEXTILE FABRIC AROUND ENTIRE INSTALLATION OF STORMTANK MODULES. CUT "X" PATTERN INTO GEOTEXTILE FABRIC AT OBSERVATION PORT AND PEEL EDGES OUT. STEP 3: INSTALL OBSERVATION PORT CTPP A- " xi. , w ATION PORT WITH SS BANDING, WATER RESISTANT TAPE OR NYLON ZIP -TIE waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS -ADD EC106 & SW 108 revisions STORMWATER MANAGEMENT DETAILS sheet title PLAN VIEW - PORT PLATE IN POSITION 5 \ OBSERVATION PORT INSTALLATION SEAL FABRIC TO OBSERVATION PORT SWI06 sheet number c+Trn n. c+Trn n. LOCATE AND MARK OPENING TR OR PIPES TO BE INSTALLED OTr-n A. INSTALL PIPE (SLIP FIT) REMOVE SIDE PANELS FROM MODULES AND CUT OPENING OPENING FOR PIPE INSTALLATION SIDE PANEL 1811 aDaDaDaDaD ®a p®a p®a p®a p®a p® PER PLAN 0 o a o ago a o a oLL 0 OF PIPE F PLAN PER PLAN SIDE PANEL INLET PIPE (BY OTHERS) REINSTALL SIDE PANELS OTrn C. WRAP AND SECURE GEOTEXTILE STORMRAP: INLET/OUTLET PIPE INSTALLATION SCALE : NTS STORMTANK® 18" MODULES INSTALLED IN STRICT ADHERANCE TO STORMTANO 18" MODULES INSTALLED IN STRICT ADHERANCE TO 3 ), STORMTANK: INLET PIPE FROM TRENCH DRAINS JLALt : STORMTANK® 18" MODULES INSTALLED IN STRICT ADHERANCE TO 5 STORMTANK: OUTLET DETAIL SW 107 SCALE: NTS N GEOTEXTILE FABRIC (PROPEX 1 OR APPROVED EQUAL) SEAL FABRIC TO INLET PIPE WITH SS BANDING, WATER RESISTANT TAPE OR NYLON ZIP TIE (BY OTHERS) PVC OUTLET (SEE PLAN FOR LOCATION(S) AND SIZE VEGETATED SLOPE 3' �OP O� EMBANKMENT FI FV AR1 on OVERFLOW STRUCTURE - NYLOPLAST 24" DROP -IN DOME GRATE RIM = 380.50 TRANSITION TO 10" STANDPIPE TO TO TOP OF STORMTANK STORMTANK®/ 18" MODULES INSTALLED IN STRICT ADHERANCE TO INSTALLATION SPECIFICATIONS TANK INV.376.00 BRENTWOOD 10" OBSERVATION PORT RAMP SOIL LAYER UP TO LIP OF STRUCTURE OR PROVIDE STONE PROTECTION AROUND STRUCTURE, TYP. RAIN GARDEN SURFACE ELEV.380.25 3" MULCH LAYER ON SURFACE OF FILTER BED 18" BIO-MEDIA MIX* �(ALLOWFOR SETTLING) �3" VDOT #8 STONE A FILTER LAYER 12" VDOT #57 STONE (DOUBLE WASHED) \\//\\ BIO-MIEDIA MIX SPECIFICATION /\/• 85%-88%SAND /AA/� • 8%- 12%SOIL FINES VAS• 3%-5%ORGANIC MATTER IN THE FORM OF LEAF COMPOST iAAiAAiA�iA�iA�iA�iA�iA�iA�iA�iA�iA� i� • THE VOLUME OF FILTER MEDIA BASED ON 12" 110% OF THE PLAN VOLUME, TO ACCOUNT FOR SETTLING OR COMPACTION RAIN GARDEN SECTION SCALE: NITS VDOT CG-2 CURB NO. 9 AGGREGAT IN OPENINGS AQUA -BRIO TYPE 4L CONCRETE PAVERS 3 -1'MIN. THICK 2" VDOT #8 AGGREGATE 4" VDOT #57 STONE 8" VDOT #2 STONE NEEDLED, NON -WOVEN, FILTER FABRIC — WITH A FLOW RATE GREATER THAN 125 GPM/SF AND AN APPARENT OPENING SIZE EQUIVALENT TO US #70 OR #80 SIEVE UNCOMPACTED SUBGRADE UNLESS COMPACTION IS REQUIRED FOR STRUCTURAL SUPPORT ON LOW STRENGTH SOILS `VDOT#21A GRAVEL BASE 1. 4" PERFORATED PVC/HDPE PIPE ALONG DOWNHILL PERIMETER AND AT 20' O.C. ACROSS SECTION 2. EXTEND CLEANOUT PIPES TO THE SURFACE WITH VENTED CAPS 3. CONNECT TO DRAINAGE SYSTEM WITH NON -PERFORATED PIPE PERMEABLE PAVEMENT SECTION SCALE : NITS Cl . Ill 1.o . "I /" , C. STRICT rIONS waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions STORMWATER MANAGEMENT DETAILS sheet title swi sheet number 07 RAINGARDEN MATERIAL SPECIFICATIONS Table 9.6. Bioretention Material Specifications Material Specific tion Notes Filter Media to contain: Filter Media • 85%-88% sand The volume of filter media based on 110% Composition 8%-12% soil fines of the plan volume, to account for settling * 3%-5% organic matter in the form or compaction. of leaf compost P-Index range = 10-30, OR Filter Media Between 7 and 21 mg/kg of P in the The media must be procured from Testing soil media. approved filter media vendors. CECs greater than 10 Mulch Layer Use aged, shredded hardwood bark Lay a 2 to 3 inch layer on the surface of the mulch filter bed. Alternative Use river stone or pea gravel, coir and Lay a 2 to 3 inch layer of to suppress weed Surface Cover jute matting, or turf cover. growth. Loamy sand or sandy loam texture, Top Soil with less than 5% clay content, pH 3 inch surface depth. For Turf Cover corrected to between 6 and 7, and an organic matter content of at least 2%. Use a non -woven geotextile fabric with Apply only to the sides and above the Geotextile/Liner a flow rate of > 110 gal./min./sq. ft. underdrain. For hotspots and certain karst (e.g., Geotex 351 or equivalent) sites only, use an appropriate liner on bottom. Choking Layer Lay a 2 to 4 inch layer of sand over a 2 inch layer of choker stone (typically #8 or #89 washed gravel), which is laid over the underdrain stone. Stone Jacket for Underdrain 1 inch stone should be double -washed 12 inches for the underdrain; and/or Storage and clean and free of all fines (e.g., 12 to 18 inches for the stone storage layer, Layer VDOT #57 stone). if needed Use 6 inch rigid schedule 40 PVC pipe Lay the perforated pipe under the length of Underdrains, (or equivalent corrugated HDPE for the bioretention cell, and install non- Cleanouts, and micro-bioretention), with 3/8-inch perforated pipe as needed to connect with Observation Perforations at 6 inches on center; the storm drain system. Install T's and Y's Wells position each underdrain on a 1% or as needed, depending on the underdrain 2% slope located nor more than 20 configuration. Extend cleanout pipes to the feet from the next pipe. surface with vented caps at the Ts and Ys. Establish plant materials as specified in the Plant one tree per 250 square feet (15 landscaping plan and the recommended feet on -center, minimum 1 inch plant list. caliper). In general, plant spacing must be sufficient Shrubs a minimum of 30 inches high to ensure the plant material achieves 80% planted a minimum of 10 feet on- cover in the proposed planting areas within Plant Materials center. a 3-year period. Plant ground cover plugs at 12 to 18 If seed mixes are used, they should be inches on -center; Plant container- from a qualified supplier, should be grown plants at 18 to 24 inches on- appropriate for stormwater basin center, depending on the initial plant applications, and should consist of native size and how large it will grow. species (unless the seeding is to establish maintained to . RAINGARDEN INSPECTION AND MAINTENANCE PERMEABLE PAVEMENT INSPECTION AND MAINTENANCE GUIDELINES: Bio-Retention and Dry Swale Maintenance Inspections MAINTENANCE OF PERMEABLE PAVEMENT IS DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE PRACTICE. It is highly recommended that a spring maintenance inspection and cleanup be conducted at each IT IS HIGHLY RECOMMENDED THAT A SPRING MAINTENANCE INSPECTION AND CLEANUP BE CONDUCTED AT EACH PERMEABLE PAVEMENT bioretention area. The following is a list of some of the key maintenance problems to look for: SITE. • Check to see if 75% to 90% cover (mulch plus vegetative cover) has been achieved in the THE FOLLOWING ARE SUGGESTED ANNUAL MAINTENANCE INSPECTION POINTS FOR PERMEABLE PAVEMENTS: bed, and measure the depth of the remaining mulch. • Check for sediment buildup at curb cuts, gravel diaphragms or pavement edges that prevents • THE DRAWDOWN RATE SHOULD BE MEASURED AT THE OBSERVATION WELL FOR THREE (3) DAYS FOLLOWING A STORM EVENT IN flow from getting into the bed, and check for other signs of bypassing. EXCESS OF 1 /2 INCH IN DEPTH. IF STANDING WATER IS STILL OBSERVED IN THE WELL AFTER THREE DAYS, THIS IS A CLEAR SIGN THAT • Check for any winter- or salt -killed vegetation, and replace it with hardier species. CLOGGING IS A PROBLEM. • Note presence of accumulated sand, sediment and trash in the pre-treatment cell or filter beds, and remove it. • INSPECT THE SURFACE OF THE PERMEABLE PAVEMENT FOR EVIDENCE OF SEDIMENT DEPOSITION, ORGANIC DEBRIS, STAINING OR • Inspect bioretention side slopes and grass filter strips for evidence of any rill or gully erosion, PONDING THAT MAY INDICATE SURFACE CLOGGING. IF ANY SIGNS OF CLOGGING ARE NOTED, SCHEDULE A VACUUM SWEEPER (NO and repair it. BROOMS OR WATER SPRAY) TO REMOVE DEPOSITED MATERIAL. THEN, TEST SECTIONS BY POURING WATER FROM A FIVE GALLON • Check the bioretention bed for evidence of mulch flotation, excessive ponding, dead plants or BUCKET TO ENSURE THEY WORK. concentrated flows, and take appropriate remedial action. • Check inflow points for clogging, and remove any sediment. • Look for any bare soil or sediment sources in the contributing drainage area, and stabilize • INSPECT THE STRUCTURAL INTEGRITY OF THE PAVEMENT SURFACE, LOOKING FOR SIGNS OF SURFACE DETERIORATION, SUCH AS them immediately. SLUMPING, CRACKING, SPALLING OR BROKEN PAVERS. REPLACE OR REPAIR AFFECTED AREAS, AS NECESSARY. • Check for clogged or slow -draining soil media, a crust formed on the top layer, inappropriate soil media, or other causes of insufficient filtering time, and restore proper filtration • CHECK INLETS, PRETREATMENT CELLS AND ANY FLOW DIVERSION STRUCTURES FOR SEDIMENT BUILDUP AND STRUCTURAL DAMAGE. characteristics. NOTE IF ANY SEDIMENT NEEDS TO BE REMOVED. Suggested Annual Maintenance Activities for Bioretention and Dry Swale Maintenance Tasks ■ mill Frequency • Mowing of grass filter strips and bioretention turf cover < 4 times a year • Sot weeding, erosion repair, trash removal, and mulch raking Twice during growing season • Add reinforcement planting to maintain desired the vegetation density As needed • Remove invasive plants using recommended control methods • Stabilize the contributing drainage area to prevent erosion • Spring inspection and cleanup • Supplement mulch to maintain a 3 inch layer Annually • Prune trees and shrubs • Remove sediment in re -treatment cells and inflow points Once every 2 to 3 years • Replace the mulch layer Every 3 years STORMTANK INSPECTION AND MAINTENANCE • INSPECT THE CONDITION OF THE OBSERVATION WELL AND MAKE SURE IT IS STILL CAPPED. • GENERALLY INSPECT ANY CONTRIBUTING DRAINAGE AREA FOR ANY CONTROLLABLE SOURCES OF SEDIMENT OR EROSION. Description Proper inspection and maintenance of a subsurface stormwater storage system are vital to ensuring proper product functioning and system longevity. It is recommended that during construction the contractor takes the necessary steps to prevent sediment from entering the subsurface system. This may include the installation of a bypass pipe around the system until the site is stabilized. The contractor should install and maintain all site erosion and sediment per Best Management Practices (BMP) and local, state, and federal regulations. Once the site is stabilized, the contractor should remove and properly dispose of erosion and sediment per BMP and all local, state, and federal regulations. Care should be taken during removal to prevent collected sediment or debris from entering the stormwater system. Once the controls are removed, the system should be flushed to remove any sediment or construction debris by following the maintenance procedure outlined below. During the first service year, a visual inspection should be completed during and after each major rainfall event, in addition to semi-annual inspections, to establish a pattern of sediment and debris buildup. Each stormwater system is unique, and multiple criteria can affect maintenance frequency. For example, whether or not a system design includes inlet protection or a pretreatment device has a substantial effect on the system's need for maintenance. Other factors include where the runoff is coming from (hardscape, gravel, soil, etc.) and seasonal changes like autumn leaves and winter salt. During and after the second year of service, an established annual inspection frequency, based on the information collected during the first year, should be followed. At a minimum, an inspection should be performed semi-annually. Additional inspections may be required at the change of seasons for regions that experience adverse conditions (leaves, cinders, salt, sand, etc). Maintenance Procedures Inspection 1. Inspect all observation ports, inflow and outflow connections, and the discharge area. 2. Identify and log any sediment and debris accumulation, system backup, or discharge rate changes. 3. If there is a sufficient need for cleanout, contact a local cleaning company for assistance. Cleaning: 1. If a pretreatment device is installed, follow manufacturer recommendations. 2. Using a vacuum pump truck, evacuate debris from the inflow and outflow points. 3. Flush the system with clean water, forcing debris from the system. 4. Repeat steps 2 and 3 until no debris is evident. 12 (Al Milk COUNTY OF ALBEMARLE Department of Community Development Construction Record Drawings (As -built) for VSMP The following is a list of information required on construction record drawings for stormwater facilities (reference Water Protection Ordinance 17-422). It is preferable that the construction record drawing be prepared by someone other than the designer. Please do not provide design drawings as construction record drawings. A. A signed and dated professional seal of the preparing engineer or surveyor. B. The name and address of the firm and individual preparing the drawings on the title sheet. C. The constructed location of all items associated with each facility, and the inspection records to verify proper dimensions, materials and installation. The items include, but are not limited to the following: 1. Inspection Records and photographs for pipe trenches and bedding, including underdrains. 2. Video Pipe Inspection for any pipes which are not accessible or viewable. 3. Updated Location with geo-coordinates of all facilities. 4. Verified Drainage Area maps for the drainage area treated, and for drainage to the facilities. 5. Current physical and topographic survey for all earthen structures. Ponds should include a survey of the pond bottom. Surveys should verify pond volumes are per design. Corrections may be required for alterations from the design. 6. Plants, location and type. 7. Plans and profiles for all culverts, Pipes, Risers, Weirs and Drainage Structures - Display the installed type of drainage structures, culvert/pipe size, weirs, materials, inlets or end treatment(s), inlet and outlet protection, alignment and invert elevations compared to design. 8. Computations: For significant deviations from design, provide sealed computations verifying that the as -built condition is equivalent or better than design. 9. Ditch Lines - Display the constructed location of all ditch lines and channels, including typical sections and linings. 10. Easements - Show all platted easements with dead book references labeled. Facilities and drainage must be within platted easements. Provide copies of recorded documents. 11. Guardrail, fences or other safety provisions - Display the constructed location of all safety provisions; fences, guardrail, including the type, length and applied end treatments, compared to design. 12. Material layers — biofilter media, stone layers, sand layers, keyways and cores must be verified as to material types and depths. Include inspection reports, boring or test pit reports and materials certifications. Biofilter media must be an approved state mix. 13. Access roads — show location of access roads, surface treatment, drainage, etc, as applicable. 14. Compaction reports are required to verify fill compaction in dams. 15. Manufacturers certifications for proprietary BMP's certifying proper installation and functioning. waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 professional seal EUGENE RYANG project manager ALAN FRANKLIN project team 2000 MARCHANT project name VA PACIFIC INVESTMENTS LLC client 2088 UNION STREET, SUITE 1 SAN FRANCISCO, CA 9413 project address W P02022-00022 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 10.19.22 - CO. COMMENTS - ADD EC106 & SW 108 revisions STORMWATER MANAGEMENT MAINTENANCE sheet title SWI08 sheet number