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Home My WebLink AboutWPO202200022 Plan - VSMP 2022-05-27VICINITY MAP: 111 = 1,000' 4 = t -`Woolen i'[is poAyc SITE �cco L000 317 *1 388 yart Rd Qµ.,IV 53 �a SHEET INDEX SHEET # SHEET TITLE EC100 COVER SHEET EC101 EROSION CONTROL PLAN NARRATIVE EC102 EXISTING CONDITIONS 2000 M A R C H A N T EC103 EROSION CONTROL PLAN - STAGE A EC104 EROSION CONTROL PLAN - STAGE B EC105 EROSION CONTROL DETAILS SW 100 PRE -DEVELOPMENT D.A. MAP SW 101 POST -DEVELOPMENT D.A. MAP SW 102 STORMWATER MODEI (1 yr) WPO/VSMP SW103 STORMWATER MODEL (IOYR) SW 104 STORMWATER QUALITY MAP SW 105 VRRM SPREADSHEETS SW 106 STORMWATER MANAGEMENT DETAILS ALBEMARLE COUNTY, VIRGINIA SW 107 STORMWATER MANAGEMENT DETAILS STANDARDS AND SPECIFICATIONS 1. VIRGINIA DEPARTMENT OF TRANSPORTATION (V.D.O.T.) ROAD AND BRIDGE SPECIFICATIONS, DATED 2007. 2. VIRGINIA DEPARTMENT OF TRANSPORTATION (V.D.O.T.) ROAD AND BRIDGE STANDARDS, DATED 2008. 3. VIRGINIA DEPARTMENT OF TRANSPORTATION (V.D.O.T.) WORK AREA PROTECTION MANUAL, DATED 2011. 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, 8TH 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 2005. 8. INTERNATIONAL CODE COUNCIL AMERICAN NATIONAL STANDARD- ACCESSIBLE & USABLE BUILDINGS AND FACILITIES, DATED 2009. 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 I TREE TO BE REMOVED x UTILITY LINE TO BE REMOVED 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/1 OOOSF. 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. 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 �}titiTH OF'r UAIanG.Frankfin NOT FOR CONSTRUCTION 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 project number WPO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions COVER SHEET sheet title EC100 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 EXPAND ENCROACH ONTO AN ADJACENT VACANT PIECE OF LAND THAT LIES BETWEEN THE MARCHANT STREET RIGHT OF WAY AND THE SUBJECT PROPERTY. THERE WILL BE 4.1.0 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 GADEN, AND AN UNDERGROUND STORMWATER DETENTION TANK WHICH WILL ALLOW FOR RELEASE OF STORMWATER BACK INTO THE EXISITNG DOWNSTREAM STORM SYSTEM AT ACCEPTABLE RATE. CONSTRUCTION SCHEDULE SITE CONSTRUCTION WILL BEGIN JANUARY OF 2023 AND CONCLUDE BY DECEMBER OF 2023. 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 THE 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 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 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 RESEEDED AS DETERMINED NECESSARY BY THE CITY OF CHARLOTTESVILLE E & S INSPECTOR IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK, THIRD EDITION (1992). 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. VEGETATIVE PRACTICES 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 30 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 STOCKPILES 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 BORROWS 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 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 INTE RITY OF THE BA IN DURING A TWENTY-FIVE 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. NON -ERODIBLE MATERIAL SHALL BE USED FOR THE CONSTRUCTION OF CAUSEWAYS AND COFFERDAMS. EARTHEN FILL MAY BE USED FOR THE STRUCTURES IF ARMORED BY NON -ERODIBLE 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 NON -ERODIBLE MATERIAL SHALL BE PROVIDED. 14. ALL APPLICABLE FEDERAL, STATE AND LOCAL REGULATIONS 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 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 THESE REGULATIONS. f. APPLICABLE SAFETY REGULATIONS 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 LOCAL PROGRAM 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. STORMWATER RUNOFF CONSIDERATION (MS-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: 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 ONE HUNDRED 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; AND (b) ALL PREVIOUSLY CONSTRUCTED MAN-MADE CHANNELS SHALL BE ANALYZED BY THE USE OF A TEN-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 TEN-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 CHANNEL TO A CONDITION WHERE A TEN-YEAR STORM WILL NOT OVERTOP THE BANKS AND A TWO-YEAR STORM WILL NOT CAUSE EROSION TO THE CHANNEL BED OR BANKS; OR (2) IMPROVE THE PIPE OR PIPE SYSTEM TO A CONDITION WHERE THE TEN-YEAR STORM IS CONTAINED WITHIN THE APPURTENANCES; OR (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 TEN-YEAR STORM TO INCREASE WHEN RUNOFF OUTFALLS INTO A MAN-MADE CHANNEL; OR (4) PROVIDE A COMBINATION OF CHANNEL IMPROVEMENT, STORM WATER DETENTION OR OTHER MEASURES WHICH IS SATISFACTORY TO THE PLAN -APPROVING 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 OF THE SUBJECT PROJECT. f. IF THE APPLICANT CHOOSES AN OPTION THAT INCLUDES STORM WATER DETENTION HE SHALL OBTAIN APPROVAL FROM THE LOCALITY 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 DISSIPATERS SHALL BE PLACED AT THE OUTFALL OF ALL DETENTION FACILITIES AS NECESSARY TO PROVIDE A STABILIZED TRANSITION FROM THE FACILITY TO THE RECEIVING CHANNEL. h. 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 STORM WATER RUNOFF 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. waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 NOT FOR CONSTRUCTION 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 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions EROSION CONTROL PLAN NARRATIVE sheet title EC101 sheet number CONSTRUCTION SEQUENCE MAINTENANCE NOTES 1. CLEARLY MARK LIMITS OF WORK. 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. 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. 1. THE INLET PROTECTION WILL BE CHECKED REGULARLY FOR SEDIMENT CLEANOUT. 3. INSTALL PERIMETER SILT FENCING, INLET PROTECTION, TREE PROTECTION, AND ALL OTHER PERIMETER MEASURES AS 2. THE GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP WHICH WOULD PREVENT DRAINAGE. SHOWN ON THE PLAN. IF THE GRAVEL IS CLOGGED BY SEDIMENT, IT SHALL BE REMOVED AND CLEANED OR REPLACED. 4. ESTABLISH STAGING AREA AND STOCKPILE AREA AS SHOWN ON PLAN. 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. RE-ROUTE GAS LINE AS SHOWN ON THE PLANS. MAINTAIN EROSION CONTROL AT DOWNHILL PERIMETER OF UTILITY THE BARRIER. TRENCH. 4. THE SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS MAINTAINED. AREAS SHALL 6. ONCE GAS UTILITIES ARE RE-ROUTED, INSTALL TEMPORARY SEDIMENT TRAP AND ASSOCIATED DIVERSION DIKES. BE FERTILIZED AND RESEEDED AS DETERMINED NECESSARY BY VIRGINIA TECH SITE DEVELOPMENT DEPARTMENT. 7. ESTABLISH ROUGH GRADES SHOWN ON STAGE A PLAN AND INSTALL TEMPORARY SEEDING ON ALL DISTURBED AREAS. B. CONSTRUCT BUILDING PADS AND CONTINUE BUILDING CONSTRUCTION WHILE MAINTAINING SEDIMENT TRAP. 9. MOVE TO STAGE B ESC PLAN PLAN I I I I N TEMP. DIVERSION DD DIKE #1 TEMP. SEDIMENT TRAP $T Tp TREE TMP 7RTNE N I D.A. = 0.60 AC. ANTEC PARTNERSHIP PROTECTION DB 854-1 16 _ 4' WIDE EMBANK. (TOP ELEV. 382.00) I STORYMETAL WAREHOUSE FENCING AT END OF STATE BOTTOM OF TRAP ELEV. 378.00 #18229ROA EET PROJECT LIMITS PARCEL A N MAINTENANCE SIGN 4.0' STONE WEIR @ ELEV. 37 1:1 SLOPE IN DB 693-352 PLAT S IL 23C WET VOLUME = 45 CY MANAGED STEEP DRY VOLUME = 58 CY PREPARATION FOR SLOPES, TYP. (LI ZONING) RETAINING WALL TMP 77-40A - _ _ SOI B BROADWAY CENTER LLC E&SC MEASURES CE CONSTRUCTION ENTRANCE E&SC STD. 3.02 T$ TEMPORARY SEEDING E&SC STD. 3.31 $F SILT FENCE E&SC STD. 3.06 SF P$ PERMANENT SEEDING E&SC STD. 3.32 IP INLET PROTECTION E&SC STD. 3.07 ® $� 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 DD DD- 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 OC DUST CONTROL E&SC STD. 3.39 TQ 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 d VAUVVVUUI.A I J RAILROAD NOTE 80' RIGHT OF WAY FOR RAILROAD IS PER DB 274-70 AND THE RIGHT OF WAY AND TRACK MAP FOR THE THESAPEAKE AND OHIO RAILWAY COMPANY DATED JUNE 3 , 1916, AND LAST REVISED JULY 17, 1978. THIS CONFLICTS YVFH FIELD MONUMENTATION AND PLATS OF RECQFP FOR THE SUBJECT - - J AND ADJACENT PROPERTA x/ Q DB4436-471 6H4/NiVMIfF _ _ _ _ 1 \ 5 (8) 410 CARBORVITAE (LI ZONING) I IP / / ' - - - X- 10" HCE o I / S LIMITS OF I C R �OUTE G ��• DISTURBANCE, TYP. \ O I ASP IOR TO \ 29'HICKOR (1.0 ACRE) I I L \N TgLLING TRAP F NEED D 1 l / \ / / / OJMAPLE AE C4 3.5 1 I I �I C4 G .5' j Po�k SILT FEN E J BLDG PAD Q 28'HICKORY OII� Huacs G�L / _J /7'ASH $F I �l I I II j' l / I LIMIT,, TYP. \ I I I / -2 JI a \ \ LAWN / 4- F T T EE SAPLI GS I / I/I /I I I I I I ' II - o cMs Hvnc®@ {TNEE ROUGH P12QTECTN A @ 16SITE I I II I Cl3I /EI373 1:1 SL PE GRAD n SPRUC�TP // I gal C4 IO 2IMAGNOLIAC LV RTIfyLET FIR N oggCO PORCH ° CIP 11 l I III I �I I I I I I l � T I---- I // � I � 11\ -I � I I 9 _ _csw_ J 30" MULB RY - �BR/CKWACEJ -- --� / _ / ZTr \ --- _ I L 49T PLAR 1 I loll 20' VEPCO ESMT. --------- / I j@ 5' 11 62\ 3@16' B 16' IoM 2-STMW/ \ IIIIIII ��-- --y- \ xp III FF 39SO4' l \----- ---(-- 1 / I\ I ,i I I 1 5 = =JJ I \ I / I / - - - - BR/C SWALE f r -I I DB 564-50 (PRIVATE) \ I I 1 11 EEEn'dfMT.+ / L/ / 20'CENTRALTELEPHONE (TEMP. DIVER ON \ I -- - I 1 RA[Naesa 1 I / / 1 / COMPANY OF VA. ESMT. I \ J C pIKE # - - - csw_ , II I /L ) / y - - - - - - _- _ \\ I I I I A H @ Q \ w 1 / I NE/ z' MAGNOLI I / / Q / / / DB 628-485 (PRIVATE) \ / I�CO wa[[ 0 11"CHERR P - - - - - \ NI 0 19" C�D \ \ 0 2:1 SLOPE / w vAccs DIS URBANC - - -' 1 I rn .r�/ �/ / LIMyTS OF L / O �OF CE MAINTAIN EXISTING\I \ I "HICK \ q� I \ I / G58�/ / / / (1. jFACRE) (.... SSMH S PAVE ENTRANCE AS I I 11 H WAY / / / TOP=372.9' \ C STRUCTION \ ` TYL IVERSION \1nIII -� i I I / O/ l/ / 11 _ RF S I I / % / OTHESUNE / l I O NTRANCE \ \ AIR SE I / / / / I / l l / / /l 50'R.O.W. SI FEN E / U c� \ \ \ \ I11" I I� I B3 @ B3 I � LL / / �� / / h i / D8342-193PLAT S s \ " e ( /\ / d V / �I / BENCHNRK#2 NSF / c� / D8542-568PLAT V 9" HK SSMH SO\ I I I I I i \ AH� 1 G/ 5� / / / 2' AGNO A / U �j / DB 1007-508PLAT TMP 78-21B TOP376.36' o, o / / / D833S-136PLAT INV. IN 364.2' 10" PVC � / i WOOLEN M ILLS, LLC INV. IN 368.T 18"DROP) I I I I I D.A. TO , O� / -L / U TRAPS I / / �/ / �SO�S�U/EP ON/ DB 5000-249 INV. IN364.2' � i I � c / �. DB841-429PLAT oUT364.0'(10"PVC) ' 315 \ / I \ \ / / J I / / 5"PE U -8' R (LI ZONING) DROP INLET \ M LTI.I H�BI o44L ✓ - / / / lR J G�� IF, P OTECTION \ _ \ F`(�,z� - \ / 2'x3' GRA TE INLET [\] C g\` CHIMNEY M I F� / C8`529 �U TOP=375.8' Q \ BO \ \rnw SF SF ONV / / / / INV=374.8' SSMH I \ \ �` 24 ---- / "\ F� SF ow _ E _ - - - IT / - _ - 4f TOP 376.26' N \\\� V C�$ �GQ o ssco INV. IN 364.9' ` 1 \ ssco / P INV. OUT 364.4' \ I / I \ ONv IP l l_ _ �R �• D ATE) EDGEPAVT. / MAIN APPR X/ / TOP 374.31' \ � � � � � N-cs ISDMH I I I I I � \ T E T P � ON \ � 8„T P � � � � \ ox �- OTECTION U w -VVJ 8, / q yyq / R.. CROA/G0 �Q INV. IN372.3' ' �� '"fit I 1 _wB�JH3 W��f/d ` ` ` P EUSSb \\I 4"M PLESNA c ` STREETCLOSED l / INV. OUT362.9' - J Or � S w \ e � / -IAIJ 'rA.� �WJ �WJ WJ _ B / - R.W.S.A.60 FORCEMAIN[APPROX.� \ \ \ \� \ B83 ARK#> -ONE / S\ \ \ W SM w F I 8"MAPLE o v GEG vEL \ / ISILT FENCE 1 I D 1 Tt MANAGED STEEP i cr\\\\ \\� _� /� W \ - - - I - SLOPES, TYP. �T F / S �C G07 rt R/GHI�Of YLINE I c lRF J -370 GR4 t EL P RK/NG \ TOP 389.73' 1 FH / INV. IN 385.T (8" iCP) N.W. 1 SILT FEN E \ SE \2 I S/ / I INV. IN386.2' (8"TCP) NORTH TMP 78 21Q "% a IW SFU ' \ I d C - - I I \ I / NV. OUT384.5' (8"TCPI SYLVESTER LAWRENCE, JR. & RL - (MANHOLE DRY) WARREN L. HERRING / C) C EtN g�IP S ACSpS• SO� T EDGEGRA�[ - - t I� CgRAGE 1 STORY DB 621 507 W N I° BROADWAYST. (END) �� - �� 1 C m � C� -j _ PARCEL E 4 to / MARCHANT Si (BEGIN) S - SOILS LIMITS, TYP. I 1 / S - _ - DB 542-568 PLAT SOILS LIMITS, TYP. i � � - I / ��F SOIL 71 B _ _ (LI ZONING) /I LIMITS OF I / / TMP 78-21 P DISTURBANCE, TYP. 28'SANITARY 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 TOP 377.42' DB 338-308 PLAT l / / INV. IN 371.4' (10" TCP) DB 1579-591 PLAT / / / �Z 0 10' 20' 40' INV. IN 372.4' (4" CIP) (LI ZONING) INV. OUT371.2' (10" TCP) #1820BROADWAYSTREET I STORYMETAL WAREHOUSE waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 NOT FOR CONSTRUCTION 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 project number WPO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions EROSION CONTROL PLAN STAGE A sheet title C 1 n , v3 sheet number T I r I i T ES E ACIFIC INVESTMENTS, LLC , 23 PLAT AREL C 1.361 ACRES SURVEYOR'S CERTIFICATION 2.) 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, N 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 OF ALL EXISTING UTILITIES BEFORE COMMENCING WORK. THE CONTRACTOR AGREES TO BE FULLY RESPONSIBLE FOR ANY AND ALL ORIGINAL DATA WAS OBTAINED STARTING ON FEBRUARY 2018 THRU JANUARY 7, 2020, UPDATED LOADING DOCK 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 AND TRACK MAP FOR THE CHESAPEAKE AND OHIO RAILWAY COMPANY I N 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 MISS UTILITY TICKET A804500955 Taken: 02/14/18 10:51 AM AND ADJACENT PROPERTIES. i MISS UTILITY CONTACT INFORMATION: TELEPHONE: 1-800-552-7001. TMP 77-40E 41820 BROADWAY STREET v I 4.) PROPERTY LIES WITHIN FLOOD ZONE 'X", NOTA F. .. DEFINED 100-YEAR FLOOD ANTEC PARTNERSHIP 1 STORY METAL WAREHOUSE a 1 STORY METAL WAREHOUSE DB 854-116 J W x' a PARCEL A o _m #1822 BROADWAY STREET DB 693 352 PLAT Q 11 a O m END OF STATE MAINTENANCE SIGN �? p M 365 IP l 4' DIP / f _ I -_ - .. 10 38�H o°° ° o° o° o o <� 6"ARBORVITAE yt X (814„ TO 0 a HKBR / "CHE C. / / �\7 28"HICKORY I I / /� NE / ��MAPLE / I 4"MA E rL TYGAS`P R�X.J I U/C I, `J G U/C 0 30 POPLAR A EDGE PA 7. G�- \ T \ \ 0 28 "HICKORY I HVAC'S / Mo LAWN I / OGn4'S HVAC® I LAWNI 4-F TTJtEESAPLIE,IGS 3,73\ z 1 �� I:/N-r 1 I / I r\ I I I I I 3 "SPRUCE I I I I 1 .rEE39s.a' I I I 2I'MAGNOLIA I o IRS waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 ( NOT FOR CONSTRUCTION professional seal EUGENE RYANG project manager ALAN FRANKLIN project team SSCOB PORCH 9agoecx 30MB� RRY J/ CSW —I I� 2-STY. W//BBSM'T. �\\ �_ / — / — /—BRICK ALE -- I — — plC -- /I / . {{ 20' VEPCO ESM7. — _ 48" P(JPLARO l I I o 39 --R H �i —U/C I I DB 564 50 — — — — — CG-6 — I V n -FFE 375 M' FFE39394 _ _ _ 20' CENTRAL TELEPHONE COMPANY 0 I6� )—_�----------------- �\ ( I I I I B 628-485 �v / i G I BRIG SWALE U/C / VA. E$M T. / �\ CIRAVE NI I _ FFE3a,JIMT. RAx=�3, 1 DPRIVATE) I L — — — _ � w , �: (PRIVATE) / ° i vnvERs — CSW — IIII 3en snr. I D 'v II1" ,HERB C� P��C1�• 7' DOG FFEWN es ALL 2 MAGN / .39d8 / I W D II / FFE nr. I�CONC`w I OLI 1 / / \ I1 a �a o./r LI VAC'S v� •� \I w oik W HICKOfjh' \ \ \ , / / \ / / cSV� L WN TOPH372.9' S\ �� \ \\1 \ \ \ \✓i I� \ /// �< --� /�� / I / / O/� / // / o ? S\ � /.� / � � / / �XOTHES LINE / - / / / / / / -} RF � �• P•`\ 10 WOOD _ /011" S\ \ \ \ I \ I I II I `V-376.6'AVED PARTm - o9HK PORCH TMP 78-218 CEDAR iBENCH r AGNo Q Q Q\ 2000 MARCHANT WOOLEN MILLS, LLC SSMH \ S I II / project name TOP=376.36 �� 2 I I / / 0/ / &W TERLINE/ /� f DB 5000-249 INV. IN 364.2 (10" PVC) S I - - I \ \ ONV/ J _ _ / II �� / VA PACIFIC INVESTMENTS LLC DB 841-429 PLAT 375 \ `� J 2-STORY D 42- T i x P� N 368.1' (8" DROP) / / / INV.-364.2' \ �dxw0 D. / / / / 5„PE EME R` �H �oF� client INV. OU 64.0' (10" PVC) ` ( \ M LTI 14 — o — — BL.15" H RY I S/27°34'571 339 / / IRS 01 \% a _ _ _ _ _ _ y�Cc� 2088 UNION STREET, SUITE 1 -�. DBL.1 "MM�U'BRY. \ �\ CHIMNEY \ wM GINLAP D "�PUBLi Mr COMCAST BOX ) IR e UFT / / i \ _�_ \ iAILB \ project address AN CISCO CA 9413 T — to \ ( uL + ; w "MULBRY. �f 1rcM mv= .2' / — — — — — — — ONE IMARC ANT ST EET F. —( — — — — — —� gIBF FJ� '� - INV.=384.1' EDGEPAV'— 4 o5sCO2 . 4' MULB \ — S U c¢WH (PRtA I J�o Mq�YFF / SSMH \ \ \ \ VEPCOE Ow q, SSCO? / DB 4 3-592 LAT---- TOP=376.26' 2'x3 G T ' . \ O ' O`PR�P`E1 — — — $ET�PZ V7=�j— —/ — — —/ l — /MAI INV. IN=364.9' \)TOP 375 \ mow- project number INV. OUT=364.4' s \ �M� INV 3748 Y N \ _ / \ U —WU —WU —'r W H, � �_yl�—W j DIP PIREUS STIR ET CLOSED P \ R.W.S O'FOR MAIN( PPROX.) '� \ V1j U—W O /S / pWC.S.AWATE" E 4M PLESNAC� \ C /)) $-------- _� —W0 `� � 0 � W� i \\ \ L - �ENCH MARK # 1 V / GRAVEL PARKING S �9 M I \ \ I 1 8"MAPLE ) I\ I G G VEV' / 3a - - - - - - - - - project phase SDMH \ \ \ Y \ OH oGE I o / TOP=374.31' INV. N=372\ I.3' \ 1p— — /W _ _ wM +I \_ I / O / NV.OUT=362.9' `7IGOT — — I / RIGHTOF WAY LINE \ I — — RF — — —370 — — — i/Ssue date2022 E.j_.n,AV T— —�N ?i,�. . `..`.E. = \\yx{'' , .P• N P I m I I FH / �� ` \ _ _ :.•:— GHQ^ g1 TMP 78-21Q . Iw P\s I I I GARAGE-1 STORY SYLVESTER LAWRENCE, JR. & 3ST W \ WARREN L. HERRING DB 621-507 to BROADWAY ST. (END) S 5� 5 s�- —I F I PARCEL'E' I ° Iw MARCHANT ST. (BEGIN) DB 542-568 PLAT I / IRF i TMP 78-21 P %J ALFRED B. SADTLER SANITARY SEWER & WATERLINE SSMH \ RF \ \ \C�9`F \ \ DB 4278-469 SSMH EASEMENTS TOP=377.42' / c4T� LOT 6, BLOCK A TOP=389.73' TEMPORARY BENCH MARKS'7 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 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. 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. 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. 1. THE INLET PROTECTION WILL BE CHECKED REGULARLY FOR SEDIMENT CLEANOUT. 3. INSTALL PERIMETER SILT FENCING, INLET PROTECTION, TREE PROTECTION, AND ALL OTHER PERIMETER MEASURES AS 2. THE GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP WHICH WOULD PREVENT DRAINAGE. SHOWN ON THE PLAN. IF THE GRAVEL IS CLOGGED BY SEDIMENT, IT SHALL BE REMOVED AND CLEANED OR REPLACED. 4. ESTABLISH STAGING AREA AND STOCKPILE AREA AS SHOWN ON PLAN. 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. RE-ROUTE GAS LINE AS SHOWN ON THE PLANS. MAINTAIN EROSION CONTROL AT DOWNHILL PERIMETER OF UTILITY THE BARRIER. TRENCH. 4. THE SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS MAINTAINED. AREAS SHALL 6. ONCE GAS UTILITIES ARE RE-ROUTED, INSTALL TEMPORARY SEDIMENT TRAP AND ASSOCIATED DIVERSION DIKES. BE FERTILIZED AND RESEEDED AS DETERMINED NECESSARY BY VIRGINIA TECH SITE DEVELOPMENT DEPARTMENT. 7. ESTABLISH ROUGH GRADES SHOWN ON STAGE A PLAN AND INSTALL TEMPORARY SEEDING ON ALL DISTURBED AREAS. B. CONSTRUCT BUILDING PADS AND CONTINUE BUILDING CONSTRUCTION WHILE MAINTAINING SEDIMENT TRAP. 9. MOVE TO STAGE B ESC PLAN PLAN I I I I N TEMP. DIVERSION DD DIKE #1 TEMP. SEDIMENT TRAP $T Tp TREE TMP 7RTNE N I D.A. = 0.60 AC. ANTEC PARTNERSHIP PROTECTION DB 854-1 16 _ 4' WIDE EMBANK. (TOP ELEV. 382.00) CSTORYMETAL WAREHOUSE FENCING AT END OF STATE BOTTOM OF TRAP ELEV. 378.00 #18229ROA EET PROJECT LIMITS PARCEL A N MAINTENANCE SIGN 4.0' STONE WEIR @ ELEV. 37 1:1 SLOPE IN DB 693-352 PLAT S IL 23C WET VOLUME = 45 CY MANAGED STEEP DRY VOLUME = 58 CY PREPARATION FOR SLOPES, TYP. (LI ZONING) RETAINING WALL TMP 77-40A - _ _ SOI B BROADWAY CENTER LLC E&SC MEASURES CE CONSTRUCTION ENTRANCE E&SC STD. 3.02 T$ TEMPORARY SEEDING E&SC STD. 3.31 $F SILT FENCE E&SC STD. 3.06 SF P$ PERMANENT SEEDING E&SC STD. 3.32 IP INLET PROTECTION E&SC STD. 3.07 ® $� 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 DD DD- 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 d VAUVVVUUI.A I J RAILROAD NOTE 80' RIGHT OF WAY FOR RAILROAD IS PER DB 274-70 AND THE RIGHT OF WAY AND TRACK MAP FOR THE THESAPEAKE AND OHIO RAILWAY COMPANY DATED JUNE 3 , 1916, AND LAST REVISED JULY 17, 1978. THIS CONFLICTS YVFH FIELD MONUMENTATION AND PLATS OF RECQFP FOR THE SUBJECT - - J AND ADJACENT PROPERTA x/ Q DB4436-471 I I / - 6H4/NiAMIfF _ _ _ _ 1 \ 5 (8) 410 CARBORVITAE (LI ZONING) X- I IP / / ' - - - - -6 ASH h/J/ o I / S LIMITS OF I ROUTE DISTURBANCE, TYP. \ O I ASP IOR TO \ 28"HICKOR (1.0 ACRE) I I L \N TgLLING TRAP F NEED D / / OJMAPLE 4„ ABLE 0 30P0(jR SILT FEN E $I \l -Ii II I\II�j\B J I BLDG PAD OI� /7'ASHQ8 Hacs F LIMIT , TYP. \\ I o_ iiPOR 1 I o GMs HV\®LAWN I/ 4- F TI EE SAPLI I GS EN ROUGH 373PROTECTN 1:1 SL PSITE Ol II SPRUCIE I I /I GRAD 80 �TP I'90'1 C LV RTIfLET 2IMAGNOLIA TI I I PR TECTI N � CH O/R h l III qI 30" MULB RYCIP csw1I I BR/CWTr l I - -I L - -7 / \\\ I I \ I \ L -48"F PLAR 2-STY 1110 - I / 20' VEPCO ESMT -04' DB 564-50 (PRIVAT E)F395aMr+ 20'CENTRALTELEPHONE EEEn/ I I IN// ?f. /lI p_ COMPANYESMiTEMP. DIVER ON DB 628-485 (PRIVATE) IKE # DD cswa-_,/ /z'MAGNOLI I"CHERR _ // == 9C 2:1 SLOPE/ /o / //// v��DIS URBANC 37S / wE�I R\GOOF CE HICK (1.ACRE)�WNOAINTAIN EXISTING -WAY SSMH PAVEENTANCEAS RFTOP=372.9' ATYL VERSION orHEsNESTRNTRANCE PR S50'R.O.W/. \ I I� I BO WOOD SI FEN E / I / Utu d cn \ I� �\ h / / OB342-193PLAT e ( /� coI / BENCH RK#2 NSF / / c � / D8542-568PLAT V ° 9"HK SSMH S \ \ I I I i / / / 3333��g�5555•.rEvT T' AGNO A / U �j / / DB1007-I&PLAT TMP 78-21B TOP376.36' O I o, o \ \ / I / / / / D8335-136PLAT INV. IN 364.2' I l0" PVC) I WOOLEN M ILLS, LLC D.A. TO INV. IN 368.T IT DROP) I I I I I --LL TRAP MANAG,eU STEEP DB 5000-249 INV.IN364.2' J ) \ G / / /SLO, TYP Py\ DB 841-429 PLAT oUT364.0'(10"PVC( ' 315 \ III I / d I \ \ / / J I / / 5"PE U -8"C R / ON (LI ZONING) IF DROP INLET \ M LTL �fH�BR; /0 ✓ / / / / lR5 \G�( P OTECTION \ SV` \ \ 2'x3' GRA TE INLET Z [\] C / e�( CHIMNEY wwR I F -� - 0T 9� O 3 �L �U / J / TOP=375.8' Q \ BO a I 1 0 \rnw SF SIF ONU / / / / INV=374.8' TSSMHOP376.26' n I \\ �`\ \1 Li • ---- / "\ F�_SF OW Q I / I T /_ _ -� E - - IT / -Q��\` INV. IN 364.9' ? T \ C \� P �L' V Cob �G o ssco G�P� INV. OUT364.4' \ 1 \ I \ \ O� IF sscoR. N� D ATE) EDGEPAVT. / LfMAINyAPPR9X/ / TOP374.31' \ Nc� ISDMH I I I I I \ T E TP ON \ 8„T P \ ox- - -- - - OTECTION U w _W3 8, / q WA NV. IN372.3' ' �� '" t I 1 _W3�RJ MAI ` ` P EUSSb \\I 4"M PLESNA c ` STREETCLOSED l / INV. OUT362.9' - B Or � S \N \ \ / -IAIJ 'rA.� �WJ �WJ �WJ _ B / /� M / - R.W.S.A.60 FORCEMACN[APPROX.� \ \ \ \� \ BB3 ARK#1 -ONV / S\ \ \ W SM w F I 8"MAPLE ° v GEG vEL \ TTTttt (SILT FENCE 1 I D 1 MANAGED STEEP i cr\ \\\ \\� _ � /� W \ - - - I - 1 1 - - C SLOPES, TYP. �T \ F / S �C G07 rt R/GHI�Of YLINE I c IRF J -370 GR4 t EL PARK/NG \ TOP 389.73' 1 FH / INV. IN 385.T (8" TCP) N.W. 1 SILT FEN E \ \2 I g/ / / I NV. IN386.2' (8"TCP) NORTH TMP 78 21Q a 1W SFU NV. OUT 384.5'(8"TCP) SYLVESTER LAWRENCE, JR. & o o le (MANHOLE DRY) WARREN L. HERRING EtN g�IP S ACSpS• SO� T EDGEGRA�C - - t I� GARAGE-1 STORY DB 621 507 BROADWAYST. (END)�� -j _ PARCEL a E to / MARCHANTST(BEGIN) S - SOILS LIMITS, TYP. I 1 / - � DB 542-568 PLAT I SOILS LIMITS, TYP. I SOIL 71 B _ _ (LI ZONING) /I LIMITS OF I / / TMP 78-21 P DISTURBANCE, TYP. 28'SANITARY SEWER & I �� ALFRED B. SADTLER (1.0ACRE) SOIL 12D WATERLINE EASEMENTS DB 4278-469 DB 342-197, 202 PLAT I SOIL 23C (PUBLIC) SSMH LOT 6, BLOCK A TOP 377.42' DB 338-308 PLAT l / / INV. IN 371.4' (10" TCP) DB 1579-591 PLAT / / / �Z 0 10' 20' 40' INV. IN 372.4' (4" CIP) (LI ZONING) INV. OUT371.2' (10" TCP) #1820BROADWAYSTREET I STORYMf-w WAREHOUSE waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 I NOT FOR CONSTRUCTION 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 project number WPO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions EROSION CONTROL PLAN STAGE A sheet title C 1 n , v3 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 12% 12' MIN. 2% DIVERSION DITCH MIN.— POSITIVE DRAINAGE WIDTH AT DESIGN WATER TO SEDIMENT ELEVATION IS 4.0' I 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. T �T �T��T�_� _•--•Y��T��T��T��T��T��T��T��T��T��T��T��T��T�_�- - - SET 1J12" WATER HYDRANT WITH FROST PROOF HYDRANT 3' ABOVE GRADE AND 4' OFF EDGE OF PAVEMENT 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 TABLE 3.32*D SITE SPECIFIC SEEDING MIXTURES FOR PIEDMONT AREA Total Lbs. Per Acre Minimum Care Lawn Commercial or Residential M200 lbs. }.ZLor Turf -Type Tall Fescue 95-100% 0-5% 0-5% Hieh-Maintenance Lawn 200-250 lbs. 1Gr�i>�1gr13imaiiii Turf -Type Tall Fescue 100% General Slope (3:1 or less) ](r•rii+ririjr?.1.1w•cue 128 lbs. Red Top Grass 2 lbs. Seasonal Nurse Crop * 20 lbs. 150 lbs. Low -Maintenance Slope (Steeper than 3:1) Iil�t•Ilol�jr iiCue 108lbs. - Red Top Grass 2 lbs. - Seasonal Nurse Crop * 20 lbs. - Crownvetch ** 20 lbs. 150 lbs. * Use seasonal nurse crop in accordance with seeding dates as stated below: February 16th through April ...................... Annual Rye May 1st through August 15th ..................... Foxtail Millet August 16th through October ...................... Annual Rye November through February 15th ................... Winter Rye ** Substitute Sericea lespedeza for Crownvetch east of Farmville, Va. (May through September use hulled Sericea, all other periods, use unbulled Sericea). If Flatpea is used in lieu of Crownvetch, increase rate to 301bs./acre. All legume seed must be properly inoculated. Weeping Lovegrass may be added to any slope or low -maintenance mix during warmer seeding periods; add 10-20 lbs./acre in mixes. PERMANENT SEEDING 2" 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 1 11 EDGE AND END JOINTS 4f* TO BE SNUGLY ABUTTED JUNCTION SLOT I (JUTE MESH WILL HAVE CHECK SLOT* STAPLED LAP JOINT IN LIEU OF EDGE JOINT) TERMINAL FOLD �I LAP JOINT 2" MIN. F MAX. 4:1 OR FLATTER I (JUTE MESH ONLY) 3' MAX. STEEPER THAN 4:1 ��I —TAMP FIRMLY I ANCHOR SLOT I I I I II I I I II *CHECK SLOT ,,, T^ ^„ 7IV lur—�' v L I I I I I I I I I I TAMP CHECK SLOT FIRMLY z VAR. VAR. NDo_ ui ui-IIIdIJI PLAN VIEW o STAPLING DIAGRAM Fru *CHECK SLOTS AT MIN. STAPLE FORMED FROM NO. 11 STEEL WIRE. 50' C-C INTERVALS; 8" STAPLE MIN. LENGTH FOR SANDY SOIL. NOT REWD WITH ALL JUNCTION SLOT 6" STAPLE MIN. LENGTH FOR OTHER SOIL. "COMBINATION" BLANKETS 1711 TAMP TERMINAL FOLD 4" TAMP FIRMLY 1,7 z" 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. 1 1 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 \ - t 379 806 27 DRY STORAGE N VPRIBI£ 380 992 60 381 1358 103 382 1753 161 WET STORAGE �, u•IL (EI(GM1FD> IUEF CLOTX MItlN*L GNo ELM ELM .SEE %AIE ].1}t CWSE ♦GpiEG.LTE� 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 3.131 COARSE AGGREGATE CROSS SECTION OF OUTLET CLASSIRIPRAP 4' STONE WEIR INV. ELEV.379.50 -�_. CREST ELEV. 381.00 4' WIDE DIVERSION BERM ELEV. 382.00 COARSE AGGREGATE 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 NOT FOR CONSTRUCTION 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 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions EROSION CONTROL DETAILS sheet title (WITH WIRE SUPPORT) EC105 sheet number TMP 77-40E #1820 BROADWAY STREET ANTE( PARTNERSHIP 1 STORY METAL WAREHOUSE h I [ ¢ 1 STORY METAL WAREHOUSE DB 854-116 J W "' a PARCEL A H w o I #1822 BROADWAY STREET DB 693 352 PLAT �l7 � p � END OF STATE MAINTENANCE SIGN �? p m �Qdov I 5 Oti m o I - 4' IP 85 (8)4" i0 6"ARBORVITAE � %� "CHE PRE-DEV. WATERSHED TO OUTFALL 1 N / T C. 0" 777 28"HICKORY (SHEET FLOW TO WOOLEN MILLS) ENE 56' waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 CN = 95534 SF C9 \ �\ \ / / / U/ 'MAPLE 41MA�E \ ITYGAS`AR�X) I U/C P . \ Tc = 5 Min. \ i C�C I 1I G G�U/C 3o/lOPLAR Tc PATH GE PAEDGPRE-DEV. WATED TO' O 28"HICKORY Hvncs OI)TFALL 2-(T2" CMP) �I I \ /. / D. . = 38,�46 SF l ' I / GM'S ® LAWN/ 4-F TT EESAPLIE,IGS AWN I I I l y l \ \ OUTFALL 1 N m CN = 69 Hvnc I (SHEET FLOW TO WOOLEN MILLS) Z / I / Tc 5.4 Mtn. / n I 03¢"SPRUCE( I 9 I �6IlIr O-PPEJ3l950. .(} A'`S I NOT FOR CONSTRUCTIONC'Q1(PRE)= 0.33 CFS RV, (PRE)- 697 CIF D I M 2�MAGNOLII IRS professional seal? $$CO?O 0 Q2(PRE)=0.40 CFS .39dM'O30"MULBRY csw /I -_-#2 EUGENE RYANG wALEQlO(PRE)=0.63 CFS 2-STY. BSM'T. BRICK 20'VEPCO ESMTTc P dS -7 CDB564-50 project managero(SHE( LOW) 48"P6PLAR39+-------- A IIcELEPHONE COMPANY 0CG-6 «PE395M-G _j _ -f VA.ESMT-AL- F-U/C / �\ GRAVE NI I I 0j3 I ?� l / / �J DB628-485 ALAN FRANKLIN I ].IPBSMI♦ M RAIN=38581 1 / \ I o / - - - PPRE-D V. W TE SH D / (PRIVATE) project team PAVM cSW .394Er PORCH // l/ - / / ' �C• \ i o - 17"DOGW D PPE3ELZE LCONC//w / Y�� II"CHERR _ ________sue- __II �##$ - -- _� / „EEE TbOU FALLz'MAGNou / a t o J _____�\ \ \ II a.:9"CD \ �GPPNi' / L f �sr�/ (� HEETIFLOWTORR)/ D.A. = 5,0611, O- WN O / SSMH \S I - o \ \ \ \ \ \ i I i // --� i� / CN =�76 / /\ TOP=372.9' \ ` / / Tc =� 5.0 MIRF i o = S\ \ \ rn \ I%� /•- / % \ ./ / XOTHESLINE / - / / 9(. S m /0 P(C \ \ n - Tc PATH/ 9 HK_ 6"CEDARAVEDPAR�l Tc IPATH T AGNO// (SgALLON CONC�)\ PORCH Q�P \ I I Iill I_I I I / R / / / �� TMP78-21B SSMH i OO D WOOLEN MILLS, LLC i TOP-376.36&WTERLINE J, DB 5000-249 (10"PVC) EMEINV. IN 364.2#2010 �\njb �\\DB 841-429 PLAT INV. N 3681(8DROP( 375 2-STORY I D 42- g',C T W0 Ili I D / / / 5" PE �I R F /ON `L. O INV. IN=364.2' • INV. OUT=364.0'(10"PVC) , \ M LTI I ° - BL.15"H RY _ _ _ _ _ S °3457'I'N339 r" O \ GINIAP LI E .ES DBE. 1 "MMU BRY. - \ Y� \ / � I COMCASTBOX R e UP / �\ CHIMNEY WM MAILBOX 27 "BR. / TLAEETINV TI Geemoo- 'qFPIlkF/j4 t6C //C MUosscoVIN:384.1�R ATE)50'WTH IF SSMH ssoz D6�3 592OHGEPAV7. T TOP=376.26' ONO�ED 2x3G / F• / / / INV. IN=364.9' I TOP 375- INV.OUT=364.4' s \ NV 3748 Y N_`y1 -W� U DIP PI EUS ox- �� W� - -✓ \ L^: U �WU -WU O \'_ S.A WATE($1nE 4" M c STREET CLOSED / -WU R.W.S � FORCWEY AIN (P1PJP�OX.) W� WU SDMH i �-� \ \ �- OHYi / �d'S %`/\ \ GRAVEL PARKING�S M y M I \ 1 1 I \ \APLE \ WV TOP 374.31' �$� \ \ ` \ s - - B, O INV.IN=372.3' \ ` _ _ _ W _ � _ wM _ INV. OUT=362.9' \lC �/� R S �T RIGHT�OF WAY LIE I IRF J i A N \ I FH / � I OUTFALL 2` OUTFACE 3 S o TMP 78-21 Q a Iw 12 CMP 0.G I I / GARAGE-1 STORY ( ) U �W I _ _ I \ I / SYLVESTER LAWRENCE, JR. & oo I� / / (SHEET FLOW TO RR) f EDGE GRAVEL �� CD Q1(PRE) = 0.69 CFStp N T - - - - - - _ WARREN L. HERRING I / / <<J 5 S �� jh o Q1(PRE) = 0.21 CFS RVl(PRE) = 1,623 CIF / I I DB621-507 �� IW BROADWAY ST. (END) r \ _ �� - S -I F _ r PARCEL "E" to RV 1(PRE) = 428 C F 2000 M A R C H A N T Q2(PRE) = 1.19 CFS MARCHANTST.(BEGIN) S SO �\ � - � DB542-568PLAT � IW / Q2(PRE) = 0.30 CFS Q1O(PRE) = 3.10 CFS IRF ` 0 i G \\ TMP78-21P �I� _ - I project name ► Summary for Subcatchment 14S:Pre-Dev2(to 12"CMPOutfall) _ _ _ _ /�= / / Q10(PRE) =0.61 CFS SSMH SANITARY SEWER & WATERLINE DB3EASEM202PLAT NOVPIN77.42'=371.(10"TCPI \� IF�T9�c[49]Hint:Tc<2dtmayrequiresmallerdt Summary for Subcatchment 2S: Pre-Dev 3 (sheet to RR) VA PACIFIC INVESTMENTS LLC (PUBLIC( INV. I111=372.4' F I4 " CIP I Runoff = 0.69 cfs @ 11.99 hrs, Volume= 1,623 Of, Depth> 0.51" [49] Hint: Tc<2dt require smaller Z j INV.OU(10"TCPI 0 10' 20' 40' client may requre sma T=371.2'2088 UNION STREET, SUITE 1 Summary for Subcatchment 1OS: Pre-Dev 1 (sheet to Woolen Mills) Runoff bySCS TR-20 method, UH=SCS, Time Span= 8.00-24.00 hrs, dt= 0.05 hrs . Runoff = 0.21 cfs @ 11.96 hrs, Volume= 428 cf, Depth> 1.01" SA N FRA NCISCO CA 9413 Type II 24-hr 1-Year Rainfall=3.00" project address [49] Hint: Tc<2dt may require smaller dt Area (sf) CN Description Runoff by SCS TR-20 method, UH=SCS, Time Span= 8.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-Year Rainfall=3.00 Runoff = 0.33 cfs @ 11.95 hrs, Volume= 697 Of, Depth> 2.37" 8,331 98 Unconnected pavement, HSG B __-- 30,215 61 >75% Grass corer, Good, HSG B Area (so CN Description Runoff bySCS TR-20 method, UH=SCS, Time S an= 8.00-24.00 hrs, dt= 0.05 hrs 38,546 69 Weighted Average, UI Adjusted CN =65 project number y p 2,116 98 Unconnected pavement, HSG B Type II 24-hr 1-Year Rainfal 1=3.00" 30,215 78.39% Pervious Area 2,947 61 >75% Grass cover, Good, HSG B 8,331 21.61 100.00 Unconnecteous ea 5,063 76 Weighted Average WPO/VSMP Area (so CN Description 8,331 100.00 /o Unconnected 2,947 58.21 % Pervious Area project phase 3,281 98 Unconnected pavement, HSG B Tc Length Slope Velocity Capacity Description 2,116 41.79% Impervious Area 253 61 >75% Grass cover, Good, HSG B 2,116 100.00% Unconnected (min) (feet) (fffft) (ft/sec) (cis) 3,534 95 Weighted Aterage 4.9 100 0.0500 0.34 Sheet Row, Sheet How-turf/pavement MAY 19, 2022 253 7.16% Pervious Area n= 0110 P2= 3 67" Tc Length Slope Velocity Capacity Description issue date 3,281 92.84% Impervious Area 0.5 127 0.0787 4.52 Shallow Concentrated Flow, Shallow Concentrated (min) (feet) (fVft) (fUsec) (cfs) 3,281 100.00% Unconnected Unpaved Kw 16.1 fps 5.0 Direct Bttry, Mininum 5.4 227 Total Tc Length Slope Velocity Capacity Description Summary for Subcatchment 14S: Pre-Dev 2 (to 12" CMP Outfall) (min) (feet) (fVft) (fVsec) (cfs) Summary for Subcatchment 14S: Pre-Dev2 (to 12" CMP Outfall) 5.0 Direct B", Mininum [49] Hint: Tc<2dt may require smaller dt [49] Hint: Tc<2dt may require smaller dt Summary for Subcatchment 10S: Pre-Dev 1 (sheet to Woolen Mills) Runoff = 3.10 cfs @ 11.97 hrs, Volume= 6,399 cf, Depth> 1.99" Runoff = 3.10 cfs @ 11.97 hrs, Volume= 6,399 cf, Depth> 1.99" [49] Hint: Tc<2dt may require smaller dt Runoff bySCS TR-20 method, UH=SCS, Time Span= 8.00-24.00 hrs, dt= 0.05 hrs Runoff bySCS TR-20 method, UH=SCS, Time Span= 8.00-24.00 hrs, dl 0.05 hrs Type II 24-hr 10-Year Rainfall=5.50" Runoff = 0.63 cfs @ 11.95 hrs, Volume= 1,366 Of, Depth> 4.64" Type II 24-hr 10-Year Rainfall=5.50" Area (so CN Description Runoff bySCS TR-20 method, UH=SCS, Time Span= 8.00-24.00 hrs, dt= 0.05 hrs Area (sf) CN Description 8,331 98 Unconnected pavement, HSG B Type II 24-hr 10-Year Rainfall=5.50" 8,331 98 Unconnected pavement, HSG B 30,215 61 >75% Grass cover, Good, HSG B 30,215 61 >75% Grass cover, Good, HSG B 38,546 69 Weighted Average, UI Adjusted CN = 65 Area (so CN Description 38,546 69 Weighted Average, UI Adjusted CN =65 30,215 78.39% Pervious Area 3,281 98 Unconnected pavement, HSG B 30,215 78.39% Pervious Area 8,331 21.61 % Impervious Area 253 61 >75% Grass cover, Good, HSG B 8,331 21.61 /o Impervious Area 8,331 100.00% Unconnected 8,331 100.00% Unconnected 3,534 95 Weighted Ar>rrage 253 7.16% Pervious Area Tc Length Slope Velocity Capacity Description Tc Length Slope Velocity Capacity Description 3,281 92.84% Impervious Area (min) (feet) (fVft) (ft/sec) (cis) (min) (feet) (ft/ft) (ft/sec) (cfs) 3,281 100.00% Unconnected 4.9 100 0.0500 0.34 Sheet Row, Sheet Row-turf/pavement 4.9 100 0.0500 0.34 Sheet Flow, Sheet Flow-turf/pavement n= 0.110 P2= 3.67" n= 0.110 P2= 3.67" Tc Length Slope Velocity Capacity Description 0.5 127 0.0787 4.52 Shallow Concentrated Flow, Shallow Concentrated 0.5 127 0.0787 4.52 Shallow Concentrated Row, Shallow Concentrated (min) (feet) (ft/ft) (ft/sec) (cfs) Unpaved Kv=16.1 fps Unpaved Kv= 16.1 fps 5.0 Direct Entry, Mininum 5.4 227 Total 5.4 227 Total 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions PRE -DEVELOPMENT D.A. MAP sheet title SW100 sheet number I TMP 77 40E RAILROAD NOTE POST-DEV. WATERSHED 2 TO SWM 80'RIGHT OF WAY FOR RAILROAD IS PER DB 274-70 AND THE RIGHTOF WAYAND (18" STO RMTAN K) ANTEC PARTNERSHIP TRACK MAP FOR THE CHESAPEAKE AND OHIO RAILWAY OMPANY DATED JUNE D.A. = 27,809 SF /STORYMETAL WAREHOUSE DB 854-116 30, 1916, AND LAST REVISED JULY 17, 1978, THIS CONFLI S WITH FIELD RV 1)POST) = 2,479 CF ROADWAYSTR PARCEL A #IB20BROADWAYSTREET MONUMENTATION AND PLATS OF RECORD FOR THE $U JECT AND ADJACENT N MANAGED STEEP PROPERTIES. CN = 78 (1-YR) SLOPES, T\ v x DB 693-352 PLAT 1 STORYMETAL WAREHOUSE END OF STATE CN - 79 (10-YR) (LIZONING) g TMP 77-40A MAINTENANCE SIGN BROADWAY CENTER LLC — __ — _— _ — _ _ _ —_ _ DB4436-471 ��_ - — _-------- _— — — — 385 —sso (LIZONINGJ I NE lty� - - _ — — cBrAlNLiroK / /E — — - - x- r- - - POST-DEV. WATERSHED TO OUTFACE 1 I ° ° / / / (SHEET FLOW TO WOOLEN MILLS) D.A. = 3,534 SF _ y / U C- AREA(JNDER CN = 95 1 \ �� C fCiOFO INSTALL�tONO/ Tc = 5 Min. \ I I I I I� w I w I I ARTS ULPU_ Tc PATH \ --� \ I I / I �� U/c (P MEABLEPPPAV MEN 1) \ G I I J u\L CN 81 O VACS / J) VRR DJU�TED CN _ 77 (Y-YR) �7 r Hvnc® VRRM A JU TED C� Ga' (l0 YR) OUTFALL I FLOW TO WOOLEN MILLS) I I I 7 J KAING DEN ER EABLE PA EMENT 1 I SUB-WAT�SHEDID.A. I I I O I I Q1(POST) = 0.70 CFS l V / (R INGAR EN 1)I I I I I RV1 (POST) - 1 440 CF I I I I I 18'I TORtv1TA K Tc PATH I I l I I LRS 1111 �o 1 ) - , `� .J_'_� °uco PORCH I VR M ADJ ST CN - 72 (}-YR) I I I / Qlo(Posr) = 1.54 CFS I I I I I I I I _ - - - J csw I VRRM AD ST CN 73 (10-YR) _ O o/CK WALE PER ABLE PAV ENT 1 I O °` 2-STY. /BSMr. EE 9504' ( SUB SHE D AEC r I / a FFE 1TBSMT.+ LU/a / ��— w RA[aaesB (PERM AB E PZEMt_NT 1) // I J I cs co wA« I CN 8 / / / I e / / a (J / Py Nc VR M ADJt STI�D C1J = 81/(1-Y) // XC'o DF� VRI�M ADJUSTED C N - Yb2 (10 R) O / / LIU .� / OTHEStlNf / I I � � �c �/ ll/l 50'R.O.W. s / / / / P /ST-qF,I/. AT 08342-193PLAr \ l y Tc AT�I /W / \ \ \ I (C -� 391 j �/ /8EN A K#2 \0 FALL 3 / ° /// / OB542--568 509PL T s \ \ N I S ALL( O C) w "' / c .� / /(SR T FLO TO R) / ��i DBIGb7-SOBPLAT OUTFACE 2 S\S I 10 j \ D.A. _ ,181 S / \ // / / D9335-135PLAT CAN- 9 (12 CMP) �.0 Main. 1� Q1(POST) = 0.33 CFS RVi POST) = 2,479 +148 CF = 2,627 CF Qlo(POST) = 2.91 CFS TMP 78-21B \ WOOLEN MILLS, LLC DB 5000-249 DB 841-429 PLAT (LI ZONING) \ —W—A G ' � MANAGED STEEP SLOPES, TYP. /LRS/ 1 ® _ CHIMNH �U O O�� OHU7 i]y / ONU F / / ° AGED�TEEP OHS ES, P \ waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 I NOT FOR CONSTRUCTION professional seal EUGENE RYANG project manager ALAN FRANKLIN project team EDGEPAV7. II _ \ SM .�. � —� W —W 3 / 7) STREET CLOSEDB WB WW OTc�A H 01 GPEtlO / RLGH OfWAYLLNE c RKING SUB -WATERSHED D.A. D I I / IRF GRAPECP� (DIRECT TO STORMTANK) S \ TMP OUTFALL3 2000 MARCHANT \ I / 2,789SF@CN=98 V a IW 573 SF @ CN = 61 SYLVESTERLAWRENCE, JR. & I oo I� / / (SHEET FLOW TO RR) WARRENL. HERRING project name W S GARAGE -I STORY DB 621-507 W N ° Q 1(POST) = 0.41 CFS PARCEL"E" a W RV1(POST) = 856 CF DB 542-568 PLAT ; / Q10(POST) = 0.87 CFS VA PACIFIC INVESTMENTS LLC BROADWAYST. (END) \ — — / client �� POST-DEV. WATERSHED 2 - - _ (LIZONING) 11 MARCHANTSi(BEGINj I / / 2088 UNION STREET, SUITE 1 (NO SWM) — � — — T�9 SAN FRANCISCO, CA 9413 TMP 78-21P D.A. = 4,861 SF 1 ��F 7 ALFRED B. SADTLER RV1(PRE) = 148 CF / 0 10' 20' 40' project address DB 4278-469 CN = 61 / LOT6, BLOCK Tc = 5.0 Min. 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 (Less s than 1 Acre) I.F. = 0.9 (Qt(PrL0.69 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) = 2,627 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 1,623/2,627)] = 0.38 cfs not remove the entire required TP load reduction. Q1(Post)= 0.33 cfs < Q(1)Allowable= 0.38 cfs (CRITERIA MET) FLOOD PROTECTION CRITERIA OUTFALL 1 & OUTFALL 3 Satisfied per 9VAC25-870-66(D) OUTFALL 2 per 9VAC25-870-66(C)(2) Qto(Post) = 2.91 cfs < Qto(Pre) =3.10 cfs (CRITERIA MET) 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions POST -DEVELOPMENT D.A. MAP sheet title SW101 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) 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 HydroCAD® 9.10 sln 06424 @ 2010 HydroCAD Software Solutions LLC Summaryfor Subcatchment 3S: Post-Dev3 (sheetto RR) [49] Hint: Tc<2dt mayrequire smallerdt Runoff = 0.41 cfs @ 11.95 hrs, Volume= 856 cf, Depth> 1.98" Runoff bySCS 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 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 Tc Length Slope Velocity Capacity Description (min) (feet) (M) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Link 1 L: Outfall 3 (Sheet Row to RR) Inflow Area = 9,515 sf, 73.70% Impervious, Inflow Depth> 1.82" for 1-Year event Inflow = 0.70 cfs @ 11.96 hrs, Volume= 1,440 cf Primary = 0.70 cfs @ 11.96 hrs, Volume= 1,440 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 2AS: Post-Dev 2 to SWM [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 (so 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) (fUtt) (It/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 0.30 cfs @ 12.12 hrs, Volume= 2,386 cf, Atten= 75%, Lag= 9.2 min 0.30 cfs @ 12.12 hrs, Volume= 2,386 cf Routing byStor-Ind method, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 376.68' @ 12.12 hrs Surf.Area= 1,350 sf Storage= 802 cf Plug -Flow detention time= 54.1 min calculated for 2,380 cf (96% of inflow) Center -of -Mass det. time= 33.3 min (884.5 - 851.1 ) Volume Invert Avail.Storage Storage Description #1 376.00' 661 cf #57 Gravel + 12" on all sides (Irregular) Listed below (Recalc) 3,375 cf Overall -1,722 cf Embedded =1,653 cf x 40.0% Voids #2 376.00' 1,645 cf 18" StormTank (Irregular) Listed below (Recalc) Inside #1 1,722 cf Overall x 95.5% Voids 2,306 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 1,350 206.0 0 0 1,350 378.50 1,350 206.0 3,375 3,375 1,865 Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic -feet) (cubic -feet) (sq-ft) 376.00 1,148 198.0 0 0 1,148 377.50 1,148 198.0 1,722 1,722 1,445 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 / Outlet Invert-- 376.00' / 375.00' S= 0.0100 'f Cc= 0.900 n= 0.012 #2 Device 1 376.00' 4.0" Vert. 4" PVC C= 0.600 #3 Device 1 376.70' 8.0" Vert. (2) - 8" PVC X 2.00 C= 0.600 PrimaryOutRow Max--0.30 cfs @ 12.12 hrs H1/\/=376.68' (Free Discharge) L1=12" HDPE (Passes 0.30 cfs of 1.59 cfs potential flow) 2=4" PVC (Orifice Controls 0.30 cfs @ 3.44 fps) 1 3=(2) - 8" PVC ( Controls 0.00 cfs) Summaryfor Subcatchment 3S: Post-Dev3 (sheet to RR) [49] Hint: Tc<2dt mayrequire 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 (sf) 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 Tc Length Slope Velocity Capacity Description (min) (feet) (M) (ft/sec) (cfs) 5.0 Direct Entry, Summaryfor 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, 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 = 0.05 cfs @ 11.99 hrs, Volume= 148 cf, Depth> 0.36" 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" Summaryfor Link 2L: Outfall 2 (12" CMP) Area (sf) Inflow Area = 32,670 sf, 8.54% Impervious, Inflow Depth > 0.93" for 1-Year event 0 Inflow = 0.33 cfs @ 12.05 hrs, Volum4,861e= 2,534 cf 4,861 Primary = 0.33 cfs @ 12.05 hrs, Volume= 2,534 cf, Atten= 0%, Lag= 0.0 min 4,861 Primary outflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs CN Descriotion 98 Unconnected pavement, HSG B 61 >75% Grass cover, Good, HSG B 61 Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cis) 5.0 Direct Entry, waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295 8177 Charlottesville, VA 22902 NOT FOR CONSTRUCTION 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 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions STORMWATER MODEL (1 YR) sheet title SW 102 sheet number I: e 0 Summary for Subcatchment 14S: Post-Dev 2 to SWM (10yr) ci) Po Dev 1 (sheet to 2AS Pev 2 to SWM Woolen) 2P 9 " StormTrap Outfall 3 (Sheet Flow to RR) 2L Outfall 2 (12" CMP) 3S Post-Dev 3 (sh t to RR) 3L Post-Dev 2 (no SVVM) Outfall 3 (Sheet Flow to RR) Drainage Diagram for Marchant-Post Subcat Reach Aon Link 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 may require smaller dt Runoff = 1.54 cfs @ 11.95 hrs, Volume= 3,282 cf, Depth> 4.14" Runoff bySCS 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 7,013 2,502 98 Unconnected pavement, HSG B 61 >75% Grass cover, Good, HSG B 9,515 88 Weighted Average 2,502 26.30% Pervious Area 7,013 73.70% Impervious Area 7,013 100.00% Unconnected Te Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Summary for Link 1 L: Outfall 3 (Sheet Flow to RR) Inflow Area = 9,515 sf, 73.70% Impervious, Inflow Depth > 4.14" for 10-Year event Inflow = 1.54 cfs @ 11.95 hrs, Volume= 3,282 cf Primary = 1.54 cfs @ 11.95 hrs, Volume= 3,282 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Inflow Area = Inflow = Outflow = Primary = [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 (sq 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) (f lft) (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 2.63 cfs @ 12.02 hrs, Volume= 7,127 cf, Atten= 26%, Lag= 3.7 min 2.63 cfs @ 12.02 hrs, Volume= 7,127 cf Routing byStor-Ind method, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 377.44' @ 12.02 hrs Surf.Area= 1,350 sf Storage= 1,700 cf Plug -Flow detention time= 35.1 min calculated for 7,108 cf (98% of inflow) Center -of -Mass det. time= 23.4 min ( 841.7 - 818.3 ) Volume Invert Avail.Storage Storage Description #1 376.00' 661 cf #57 Gravel + 12" on all sides (Irregular) Listed below (Recalc) 3,375 cf Overall - 1,722 cf Embedded = 1,653 cf x 40.0% Voids #2 376.00' 1,645 cf 18" StormTank (Irregular) Listed below (Recalc) Inside #1 1,722 cf Overall x95.5%Voids 2,306 cf Total Available Storage Elevation Surf.Area Perim. Inc.Store Cum.Store VVet.Area (feet) (sq-ft) (feet) (cubic -feet) (cubic -feet) (sq-ft) 376.00 1,350 206.0 0 0 1,350 378.50 1,350 206.0 3,375 3,375 1,865 Elevation Surf.Area Perim. Inc.Store Cum.Store VVet.Area (feet) (sq-ft) (feet) (cubic -feet) (cubic -feet) (sq-ft) 376.00 1,148 198.0 0 0 1,148 377.50 1,148 198.0 1,722 1,722 1,445 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' 4.0" Vert. 4" PVC C= 0.600 #3 Device 1 376.70' 8.0" Vert. (2) - 8" PVC X 2.00 C= 0.600 PrimaryOutHow Max=2.57 cfs @ 12.02 hrs HVV=377.42' (Free Discharge) t1=12" HDPE (Passes 2.57 cfs of3.64 cfs potential flow) 12=4" PVC (Orifice Controls 0.47 cfs @5.40 fps) 3=(2) -8" PVC (Orifice Controls 2.10 cfs @3.01 fps) Summary for Link 2L: Outfall 2 (12" CMP) Inflow Area = 32,663 sf, 8.52% Impervious, Inflow Depth > 2.87" for 10-Year event Inflow = 2.91 cfs @ 12.01 hrs, Volume= 7,806 cf Primary = 2.91 cfs @ 12.01 hrs, Volume= 7,806 cf, Atten= 0%, Lag= 0.0 min Primaryoutflow = Inflow, Time Span= 5.00-24.00 hrs, dt= 0.05 hrs Summaryfor Subcatchment 3S: Post-Dev3 (sheetto RR) [49] Hint: Tc<2dtmayrequire smallerdt 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 Rai nfall=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 Te 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) Inflow Area = 5,181 sf, 79.02% Impervious, Inflow Depth > 4.35" for 10-Year event Inflow = 0.87 cfs @ 11.95 hrs, Volume= 1,876 cf Primary = 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 = 0.33 cfs @ 11.97 hrs, Volume= 679 cf, Depth> 1.68" 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" FWAMTS MdmeP=D - i . 0. a 0 98 Unconnected pavement, HSG B 4,861 61 >75% Grass cover, Good, HSG B 4,861 61 VAkighted Average 4,861 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, 2000 MARCHANT W PO/VSMP MAY 19, 2022 STORMWATER MODEL (1 OYR) Xref ..\..\..\1-Proiects\0-PROJECT FOLDER\CAD\02 Xrefs\Title Blocks\WSS-TB-ARCH D XREF.dwa SWI03 SDIL 23C I I LIMITS OF DISTURBA (1.0 ACRE) PRE -DEVELOPMENT MAP SOILS DIVIDE, TYP. 268 SF RAIN( T I I L\Vl :IIrd :1011I_1 on N PAVEMENT CHv � LIMITS OF DISTURBANCE, TYP. (1.0 ACRE) Hv,CX POST -DEVELOPMENT MAP 0 15' 30' 60' 1- VRRM LAND USE KEY (PRE-DEV) ILIMITS OF DISTURBANCE 1.00 ACRES MANAGED TURF, HSG B 0.68 ACRES IMPERVIOUS COVER, HSG B 0.32 ACRES C 0 O p0 , _ O O 0 0 0 0 0_? i — OH CHU O U SOIL 12D a � b 0 15' 30' 60' VRRM LAND USE KEY (POST-DEV) ILIMITS OF DISTURBANCE 1.00 ACRES MANAGED TURF, HSG B 0.42 ACRES 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 SA Provided=268 sf TP Load Reduction Provided =0.10 Ibs/yr DA C Wafer 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.ecoUstemservices.us ionCa..ecosystemservices.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 Project HUC: 02080204 Bank HUC: 02080204 Bank Address: 2705 Lambs Road, Charlottesville, VA 22901 Dear Mr. Franklin, W appreciate the opportunity to provide a credit availability letter for 0.50 pounds of phos orus for e above referenced project. This letter is to certify that as of today, May 18, 2022, Ivy Cree utrient Bank has 171.08 pounds of phosphorus (TP), 263.26 pounds of nitrogen ( N), and 53,946.89 unds° °f TSS available for transfer to those entities requiring offsets in accorda a with the Chesap ke B y Watershed Nutrient Credit Exchange Program (VA Code § 62.1-44.19:14 a s�q.). Those offset re al o transferable in accordance with the Virginia stormwater offset program (VA Code § 62.1 44.1 5) a d the Virginia Soil and Water Conservation Board's Guidance Document on Stormwater Nonpoint trie Offsets approved on July 23, 2009, to those regulated entities qualifying for nutrient cr its. e ( �Y° We can certain) a ommodate your needs and could offer to fulfil the order o °0.50, o ' phosphorus. Please feel free to contact us ° h any questions. I hope we have the opportunity to work together on this ¢ j project. Sincerely —'zP✓ Ecosyste171;l ervl s, L . e6 .87Y , BY; , 8 li.ey+Yl'yp ( i'p'�' 1i I (�- II •'i .;� � 1fi- � �i y �,• Ip i -( IL V e` r �' 6 V "y lu d i� II IY d o , i D r pII 1 IV I a� _i) ➢` id 1A I] II�� ' �' 1 y� I �� "� �' �I^1d4P?i,�j,12rpA�'�y .`tY'yp.'S' IQ� I�✓i�-6� l�/ Ip,�( r�rJ q 1 o i� II i 1i 1, �I I� Yll fol it b i dIl l it rlY l II^ll 1 �I III, 1 fig° Ariz �' �I l: f 1,J <I I, i11.i1 i� I/!\ill II i% > ifh �.iai ii Jp4- � � all Ibl ^�Jl lI V: III ;v I,1� �� I�il Ile r>n 7 a Yy II A. 1 I 11 V)i p �II GI I! w a t e r s t reetst u d i o landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 i NOT FOR CONSTRUCTION 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 project number WPO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions STORMWATER QUALITY MAP sheet title SW 104 sheet number 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 1 0.17 1 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 1 0.21 1 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 1 0.13 1 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 NOT FOR CONSTRUCTION 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 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions VRRM SPREADSHEETS sheet title SWI05 sheet number T-0" (914 mm) p00000017 a000000q o ® 000 oo® 0D0a00o0000C 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 b 000000� a000000d E E (O O 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 Ibs. (kg) ST-18 18 (457) 6.436 (0.18) 95.5% 22.7 (10) ST-24 24 (610) 8.656 (0.25) 96.0% 26.3 (12) 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 Ema Loa Loa Eon pm T®v oma oma oma omv omy ®a Dma Dma Dma 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 DO ma Dma Dma Dma D®a D® aDa OaD4Da p®a p®a pma p®a o® E ®� °®° 9OA °m° ®° �® a� a� a� aE a, ®a D®a D®a Dma D®a D® `14; aDaDaDaDaD ma Dma Dma Dma DEon a D® Oa Dma Dma Dma Dma DO ma Dma Dma Dma Dma Dm 30" (762 mm) SIDE PANEL o E CV 00 NOTES: 1. SIDE PANELS TO BE INSTALLED ALONG SYSTEM PERIMETER, UNLESS OTHERWISE SPECIFIED. 2. ALL HEIGHTS TO BE CUT FROM A 36" (914 ml 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 :NTS 1'-6" (457 mm) aDaDaDaDaD ma Dma Dma Dma Dma Dm a o A o a o A o a o ma Dma Dma Dma Dma Dm ma Dma Dma Dma Dma Dm aDa®aDaDaDaD ®a p p®a pma o®a p® a7a7a7 4E aU ®a �®a o®a pma �® ®a D®a D®a Dma Dma D® ®a D®a D®a D®a D®a D® ma Dma Dma Dma Dma Dm Jrova Dma Dma Dma Dma Dm O 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: 3'-0" (914 mm) V-6" (457 mm) p000000o a000000q ® 0000 000a o000 0000 �o o �ao0oa�a�0 o a0 �DO0OaDO0 °� �0ODO)Oao 1'-6 °0000 o O OoOo °a 0 (457 ml ° ° ° 1 DDO�OaDO OaDO�Oa0 0 0 0 0° O O O O °� Q° O Da�Or� r�4M O °Q oo� ®�o�o s 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. QTF-:ID A - An lXJ FLANGE PLATE MARK & CUT FLANGE PLATE FLUSH WITH MODULE SIDE "WHEN MODULE IS ON THE PERIMETER OF THE SYSTEM." PLAN VIEW - PORT PLATE IN POSITION \/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. QTl 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. OBSERVATION PORT INSTALLATION STEP 3: INSTALL OBSERVATION PORT STEP 6: v..'� .,vATION PORT WITH SS BANDING, WATER RESISTANT TAPE OR NYLON ZIP -TIE SEAL FABRIC TO OBSERVATION PORT waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 i I NOT FOR CONSTRUCTION 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 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions STORMWATER MANAGEMENT DETAILS sheet title SWI06 sheet number c+Trn n. c+Trn n. LOCATE AND MARK OPENING TR OR PIPES TO BE INSTALLED OTr-Il A. INSTALL PIPE (SLIP FIT) REMOVE SIDE PANELS FROM MODULES AND CUT OPENING OPENING FOR PIPE INSTALLATION SIDE PANEL 1811 aDaDaDaDaD °a D°a D®a M D®a D® 0a p0a p0a pa p06 p0 PER PLAN °a D®a D®QID®a D®a D® a 4- --i-- p0 0DID °a D°a D°QID°a D°a D° 0a aon p n p0a p0 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 OTrP1 C. WRAP AND SECURE GEOTEXTILE STORMRAP: INLET/OUTLET PIPE INSTALLATION SCALE : NTS STORMTANK® 18" MODULES INSTALLED IN STRICT ADHERANCE TO 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 STORMTANO 18" MODULES INSTALLED IN STRICT ADHERANCE TO 3 \ STORMTANK: INLET PIPE FROM TRENCH DRAINS NTS STORMTANK® 18" MODULES INSTALLED IN STRICT ADHERANCE TO 5 STORMTANK: OUTLET DETAIL SW 107 SCALE: NTS VEGETATED SLOPE 3' �OP O� EMBANKMENT FI FV iw 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 Gu , 18" BIO-MEDIA MIX* �(ALLOW FOR SETTLING) �3" VDOT #8 STONE FILTER LAYER /N 12" VDOT #57 STONE (DOUBLE WASHED) \ BIO-MIEDIA MIX SPECIFICATION /�/• 85%-88%SAND %A�j� • 8%- 12%SOIL FINES ��• 3%-5%ORGANIC MATTER IN THE FORM OF �/� /�� LEAF COMPOST �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: NTS VDOT CG-2 CURB NO. 9 AGGREGAT IN OPENINGS AQUA-BRIC TYPE 4L CONCRETE PAVERS 3 8" 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 Cl .Ill'.o . "I (" '110 STRICT rIONS waterstreetstudio landscape architecture I civil engineering 418 E Main Street 434.295.8177 Charlottesville, VA 22902 NOT FOR CONSTRUCTION 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 project number W PO/VSMP project phase MAY 19, 2022 issue date 1. 12.03.2021 - ELIMINATE OFF -SITE IMPROVEMENTS revisions STORMWATER MANAGEMENT DETAILS sheet title SWI07 sheet number