Sheet_C-504_dated_05_29_2019.pdf

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6"

A2

POROUS CONCRETE PAVEMENT

NO SCALE

NOTES:

1. INSTALL ONE OBSERVATION WELL IN THE BIORETENTION BASIN

(SEE DETAIL C-507).

2. THE OBSERVATION WELL IS TO CONSIST OF 6-INCH DIAMETER PVC

SCHEDULE 40 PIPE (ASTM STD. D 1784) WITH A CAP SET 6 INCHES

ABOVE GROUND LEVEL AND IS TO BE LOCATED NEAR THE

LONGITUDINAL CENTER OF THE BIORETENTION BASIN. THE PIPE

SHALL HAVE A PLASTIC COLLAR WITH RIBS TO PREVENT ROTATION

WHEN REMOVING CAP. THE SCREW TOP LID SHALL BE

A “PANELLA” TYPE CLEANOUT WITH A LOCKING MECHANISM OR

SPECIAL BOLT TO DISCOURAGE VANDALISM. A PERFORATED (1/2

INCH DIAMETER HOLES) PVC SCHEDULE 40 PIPE SHALL BE

PROVIDED AND PLACED VERTICALLY WITHIN THE BIORETENTION

SOIL MEDIA PORTION OF THE BASIN AND A CAP PROVIDED AT THE

BOTTOM OF THE PIPE. THE BOTTOM OF THE CAP SHALL REST ON

THE BIORETENTION BASIN BOTTOM.

B4

OBSERVATION WELL

NO SCALE

6" SCH 40 SOLID

PVC RISER PIPE

6" SCH 40

PERFORATED

PVC PIPE

3" SHREDDED

HARDWOOD

MULCH LAYER

FINISHED GRADE

CLEAN STONE

LAYER

SCREW TOP LID

PIPE SEAL GASKET

A5

CLEANOUT

NO SCALE

SEWER LINE

45° BEND

FINISHED

GRADE

UNLESS CLEANOUT IS IN

18"X18"X6" DEEP CONC. PAD

CONC. PAVEMENT

PLUG IF LINE DOES

NOT CONTINUE

DIRECTION

OF FLOW

C1

INFILTRATION BASIN

NO SCALE

MAINTENANCE NOTES

1. PAVEMENT SURFACES SHOULD BE SWEPT AND VACUUMED TO REDUCE SEDIMENT ACCUMULATION AND

ENSURE CONTINUED SURFACE POROSITY. SWEEPING SHOULD BE PERFORMED AT LEAST TWICE

ANNUALLY WITH A COMMERCIAL CLEANING UNIT. WASHING SYSTEMS AND COMPRESSED AIR UNITS

SHOULD NOT BE USED TO PERFORM SURFACE CLEANING.

2. DRAINAGE PIPES, INLETS, STONE EDGE DRAINS, AND OTHER STRUCTURES WITHIN OR DRAINING TO THE

SUBBASE SHOULD BE CLEANED OUT AT REGULAR INTERVALS.

3. TRUCKS AND OTHER HEAVY VEHICLES CAN GRIND DIRT AND GRIT INTO THE POROUS SURFACES, LEADING TO CLOGGING AND PREMATURE FAILURE. THESE VEHICLES SHOULD BE PREVENTED FROM

TRACKING AND SPILLING MATERIAL ONTO THE PAVEMENT.

4. DEICERS SHOULD BE USED IN MODERATION. WHEN USED, DEICERS SHOULD BE NON-TOXIC AND

ORGANIC AND CAN BE APPLIED EITHER AS CALCIUM MAGNESIUM ACETATE OR AS PRETREATED SALT.

SNOW PLOWING SHOULD BE DONE CAREFULLY WITH BLADES SET ONE-INCH HIGHER THAN NORMAL.

PLOWED SNOW PILES AND SNOWMELT SHOULD NOT BE DIRECTED TO PERMEABLE PAVEMENT.

5. TYPICAL MAINTENANCE ACTIVITIES FOR PERMEABLE PAVING ARE SUMMARIZED BELOW (TABLE 5.17).

CONSTRUCTION NOTES

1. INSTALLATION PROCEDURES ARE VITAL TO THE SUCCESS OF PERVIOUS

PAVEMENT PROJECTS, PARTICULARLY PERVIOUS ASPHALT AND

CONCRETE PAVEMENT MIXES. THE SUBGRADE CANNOT BE OVERLY

COMPACTED WITH THE INCLUSION OF FINE PARTICULATES OR THE VOID

RATIO CRITICAL TO PROVIDING STORAGE FOR LARGE STORM EVENTS

WILL BE LOST. WEATHER CONDITIONS AT THE TIME OF INSTALLATION CAN

AFFECT THE FINAL PRODUCT. EXTREMELY HIGH OR LOW TEMPERATURES

SHOULD BE AVOIDED DURING CONSTRUCTION OF PERVIOUS ASPHALT

AND CONCRETE PAVEMENTS.

2. AREAS FOR POROUS PAVEMENT SYSTEMS SHALL BE CLEARLY MARKED

BEFORE ANY SITE WORK BEGINS TO AVOID SOIL DISTURBANCE AND

COMPACTION DURING CONSTRUCTION.

3. POROUS PAVEMENT AND OTHER INFILTRATION PRACTICES SHOULD BE

INSTALLED TOWARD THE END OF THE CONSTRUCTION PERIOD. UPSTREAM

CONSTRUCTION SHALL BE COMPLETED AND STABILIZED BEFORE

CONNECTION TO POROUS PAVEMENT SYSTEM. A DENSE AND VIGOROUS

VEGETATIVE COVER SHALL BE ESTABLISHED OVER ANY CONTRIBUTING

PERVIOUS DRAINAGE AREAS BEFORE RUNOFF CAN BE ACCEPTED INTO

THE FACILITY.

4. SUBSURFACE AREA SHOULD BE EXCAVATED TO PROPOSED DEPTH.

EXISTING SUBGRADE SHALL NOT BE COMPACTED OR SUBJECT TO

EXCESSIVE CONSTRUCTION EQUIPMENT PRIOR TO PLACEMENT OF

GEOTEXTILE AND STONE BED. WHERE EROSION OF SUBGRADE HAS

CAUSED ACCUMULATION OF FINE MATERIALS AND/OR SURFACE PONDING,

THIS MATERIAL SHALL BE REMOVED WITH LIGHT EQUIPMENT AND THE

UNDERLYING SOILS SCARIFIED TO A MINIMUM DEPTH OF 6 INCHES WITH A

YORK RAKE OR EQUIVALENT AND LIGHT TRACTOR.

5. THE BOTTOM OF THE INFILTRATION BED SHALL BE AT A LEVEL GRADE.

6. PLACE GEOTEXTILE AND RECHARGE BED AGGREGATE IMMEDIATELY

AFTER APPROVAL OF SUBGRADE PREPARATION TO PREVENT

ACCUMULATION OF DEBRIS OR SEDIMENT. PREVENT RUNOFF AND

SEDIMENT FROM ENTERING THE STORAGE BED DURING THE PLACEMENT

OF THE GEOTEXTILE AND AGGREGATE BED.

7. PLACE GEOTEXTILE IN ACCORDANCE WITH MANUFACTURER’S STANDARDS

AND RECOMMENDATIONS. ADJACENT STRIPS OF FILTER FABRIC SHALL

OVERLAP A MINIMUM OF 16 INCHES. FABRIC SHALL BE SECURED AT LEAST

4 FEET OUTSIDE OF BED. THIS EDGE STRIP SHOULD REMAIN IN PLACE

UNTIL ALL BARE SOILS CONTIGUOUS TO BEDS ARE STABILIZED AND

VEGETATED.

8. AS THE SITE IS FULLY STABILIZED, EXCESS GEOTEXTILE CAN BE CUT BACK

TO THE EDGE OF THE BED.

9. INSTALL AGGREGATE COURSE IN LIFTS OF 6-8 INCHES. KEEP EQUIPMENT

MOVEMENT OVER STORAGE BED SUBGRADES TO A MINIMUM. INSTALL

AGGREGATE TO GRADES INDICATED ON THE DRAWINGS. THE MATERIALS

OF CONSTRUCTION SHOULD BE IN ACCORDANCE WITH SPECIFICATION 32

11 20 BASE COURSE FOR RIGID PERVIOUS PAVING.

GENERAL SPECIFICATIONS

1. SUBBASE AGGREGATES SHALL BE CLEAN AND FREE OF FINES. ALL AGGREGATES WITHIN INFILTRATION

STORAGE BEDS SHALL MEET THE FOLLOWING CRITERIA:

· MAXIMUM WASH LOSS OF 0.5%

· MINIMUM DURABILITY INDEX OF 35

· MAXIMUM ABRASION OF 10% FOR 100 REVOLUTIONS AND MAXIMUM OF 50% FOR 500 REVOLUTIONS

INSPECTIONS DURING CONSTRUCTION

1. REGULAR INSPECTIONS SHALL BE MADE DURING THE FOLLOWING STAGES OF CONSTRUCTION:

· DURING EXCAVATION TO SUBGRADE.

· DURING PLACEMENT AND BACKFILL OF ANY DRAINAGE OR DISTRIBUTION SYSTEM(S).

· DURING PLACEMENT OF THE CRUSHED STONE SUBBASE MATERIAL.

· DURING PLACEMENT OF THE SURFACE MATERIAL.

· UPON COMPLETION OF FINAL GRADING AND ESTABLISHMENT OF PERMANENT STABILIZATION.

3:1 SIDE

SLOPES (TYP)

4" TOPSOIL - SEED & MULCH

(SEE NOTE 2)

INSPECTION RISER

(SEE DETAIL THIS SHEET)

EXISTING NATIVE SOIL

WITH INFILTRATION

RATE > 5" PER HOUR

3'-0' MINIMUM

BEDROCK/GROUNDWATER

NOTES

1. BOTTOM OF INFILTRATION BASIN SHALL HAVE A MINIMUM SURFACE AREA OF 167 SF.

2. TOPSOIL SHALL BE HAVE EQUIVALENT INFILTRATION RATE AS EXISTING SOIL

(GREATER THAN 5" PER HOUR).

INFILTRATION BASINS NOTES AND SPECIFICATIONS

1. THE SEQUENCE OF VARIOUS PHASES OF BASIN CONSTRUCTION SHALL BE

COORDINATED WITH THE OVERALL PROJECT CONSTRUCTION SCHEDULE. THE

PARTIALLY EXCAVATED BASIN, CANNOT SERVE AS A SEDIMENTATION BASIN.

2. INITIAL BASIN EXCAVATION SHOULD BE CARRIED TO WITHIN 2 FEET OF THE FINAL

ELEVATION OF THE BASIN FLOOR. FINAL EXCAVATION TO THE FINISHED GRADE

SHOULD BE DEFERRED UNTIL ALL DISTURBED AREAS ON THE WATERSHED HAVE

BEEN STABILIZED OR PROTECTED. THE FINAL PHASE EXCAVATION SHOULD

REMOVE ALL ACCUMULATED SEDIMENT. RELATIVELY LIGHT TRACKED

EQUIPMENT IS RECOMMENDED FOR THIS OPERATION TO AVOID COMPACTION OF

THE BASIN FLOOR. AFTER THE FINAL GRADING IS COMPLETED, THE BASIN

SHOULD RETAIN A HIGHLY POROUS SURFACE TEXTURE.

3. INFILTRATION BASINS MAY BE LINED WITH A 6- TO 12-INCH LAYER OF FILTER

MATERIAL SUCH AS COARSE SAND (AASHTO STD. M-43, SIZES 9 OR 10) TO HELP

PREVENT THE BUILDUP OF IMPERVIOUS DEPOSITS ON THE SOIL SURFACE. THE

FILTER LAYER CAN BE REPLACED OR CLEANED WHEN IT BECOMES CLOGGED.

WHEN A 6-INCH LAYER OF COARSE ORGANIC MATERIAL IS SPECIFIED FOR

DISCING (SUCH AS HULLS, LEAVES, STEMS, ETC.) OR SPADING INTO THE BASIN

FLOOR TO INCREASE THE PERMEABILITY OF THE SOILS, THE BASIN FLOOR

SHOULD BE SOAKED OR INUNDATED FOR A BRIEF PERIOD, THEN ALLOWED TO

DRY SUBSEQUENT TO THIS OPERATION. THIS INDUCES THE ORGANIC MATERIAL

TO DECAY RAPIDLY, LOOSENING THE UPPER SOIL LAYER.

4. EROSION PROTECTION OF INFLOW POINTS TO THE BASIN SHALL ALSO BE

PROVIDED.

5. THE BASIN SIDE SLOPES AND FLOOR SHALL BE STABILIZED WITH VEGETATION.

SELECTION OF SUITABLE VEGETATIVE MATERIALS AND APPLICATION OF

REQUIRED LIME, FERTILIZER, ETC. SHALL BE DONE IN ACCORDANCE WITH THE

THE PERMANENT SEEDING REQUIREMENTS PROVIDED ON SHEETC-752, DETAIL

C4.

6. MOWING SHALL BE CONDUCTED AT LEAST TWICE A YEAR, ONCE IN JUNE AND

AGAIN IN SEPTEMBER.

2'-6"

INFILTRATION

BASIN BOTTOM

6" SCH 40 SOLID

PVC RISER PIPE

6"

THREADED CLEANOUT CAP

INSPECTION RISER

FILTER LAYER

6"

POROUS CONCRETE

SURFACE COURSE

COMPACTED SUBGRADE

SAND LAYER (ONSITE SATISFACTORY

SAND MATERIAL MAY BE USED)

FILTER BLANKET (3/8" DIA. PEA GRAVEL)

3"

8"

RESERVOIR COURSE

(CRUSHED STONE AASHTO NO. 3)

4"

12"

GEOTEXTILE FILTER FABRIC ON

SIDES OF EXCAVATION

INFILTRATION BASIN BOTTOM

(SEE NOTE 1)

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