Why ECO: Advantages/Maintenance

Professional_Why ECO_Advantages

The Permeable Paver Advantages

EP Henry ECO™ Line of  Permeable Pavers…

  • infiltrate, filter and decrease stormwater runoff rate and reduce Total Maximum Daily Load (TMDL).
  • are LEED® point eligible for Sustainable Sites, Water Efficiency, Materials & Resources and/or Innovative Design; Contribute to Green Globe points.
  • meet U.S. Environmental Protection Agency (EPA) stormwater performance criteria as a structural best management practice (BMP) while providing parking, road and pedestrian surfaces.
  • help meet local, state and provincial stormwater drainage design criteria, and provide compliance with the U.S. National Pollutant Discharge Elimination System (NPDES) regulations.
  • are the only paver selected by the USEPA to be used in a long term study of permeable pavement options vs. traditional non-permeable paving.
  • provide 100% pervious surface by runoff passing through small, aggregate-filled openings between solid high-strength durable concrete pavers.
  • reduce or eliminate stormwater detention and retention ponds, storm sewers, drainage appurtenances, and related costs.
  • may be used on sloped sites with proper design.
  • have the modular concrete units that allow for project phasing; open-graded base and subbase materials are typically available locally.
  • are ideal for implementation with rainwater harvesting systems (systems capable of storing water for on-site irrigation or building grey water use).
  • may be designed with underground stormwater storage systems, over many slower-draining clay soils and in cold climates.
  • process and reduce pollutants from vehicular oil drippings.

Construction advantages over other permeable pavement systems:

  • Professional_Why ECO_Advantages2b

    can install and compact aggregate subbase and base with standard paving equipment
  • pavers, non-frozen bedding material and base/subbase are installable in freezing temperatures over non-frozen soil subgrade
  • no post-installation curing time is necessary - surface is ready to use upon installation; modular construction allows for project phasing

 

Permeable Paver Maintenance
If properly installed and maintained, an EP Henry ECO Permeable Pavers should function for many decades. Maintaining surface infiltration and resulting exfiltration is essential to their optimum long-term performance.

Guidelines for properly maintaining EP Henry permeable paver systems:

  • Once or twice annually (typically spring/fall): vacuum surface, adjusting vacuuming schedule per sediment loading and/or any build up of sand deposits from winter.
  • Use of a dry vacuum-type sweeper is recommended during precipitation-free periods to remove encrusted sediment, leaves, grass clippings, etc. Vacuum and sweeper settings should be adjusted in order to prevent removal of aggregate from the paver voids and joints.
  • The use of pressure washers on open-jointed permeable paver systems is not recommended. Application of a commercial vacuum sweeper with water jets, sweeper and vacuum bar attachment will cause evacuation of clogged void materials from joint and void openings. This material may be recycled at a wash site or new aggregate materials may be utilized. (Refer to specifications for size and grade). Typically, jointing materials should be swept into joints and void openings until the bottom of the chamfer is full.
  • For removal of water ponding on surface immediately after a storm (due to paver joints or openings being severely loaded with sediment): test the surface infiltration rate using ASTM C1701. Vacuum clean to remove surface sediment and soiled aggregate (typically ½"  to 1" or 13-25 mm deep), refill joints with clean aggregate, sweep surface clean, and test the infiltration rate again per C1701 to minimum 50% increase.
  • Adjacent properties, pavements, landscaped areas and grasses should be monitored periodically to ensure that runoff from these sources is not depositing silts and debris on the permeable surface. Construction traffic, agricultural areas (no ground cover), beach area, and areas subject to high winds that will carry these fine particles will require more frequent sweeping than urban areas.
  • Permeable joint material may be added or replaced by mechanically or manually sweeping into joints and void areas if necessary. Refer to paver specifications for type and grade.
  • Settlements in pavement surface, access for utility repair, and the removal of broken or damaged pavers by an experienced paver installer is recommended. Pavers should be extracted; setting bed and void materials should be salvaged and kept separate.
  • Base materials should be removed if access for utilities is required. Settlement repair depending on depth can be restored with additional base materials if settlement exceeds +/- 3/8" over a 10' straight edge. Setting bed will be made level and pavers re-instated with void materials replaced in joints and voids with compaction bringing the pavers to flush and ready-to-use condition.

During Annual Inspections:

  • Replenish aggregate in joints if more than ½". (13 mm) from chamfer bottoms on paver surfaces.
  • Inspect vegetation around the paver surface perimeter for cover and soil stability, repair/replant as needed.
  • Inspect and repair all paver surface deformations exceeding ½" (13 mm).
  • Repair pavers offset by more than ¼" (6 mm) above/below adjacent units or curbs, inlets, etc.
  • Replace cracked paver units impairing surface structural integrity.
  • Check drains outfalls for free flow of water and outflow from observation well after a major storm.

Suggested Winter Maintenance

Snow removal - Snow and ice on year-round parking surfaces, streets and plazas can be plowed with truck-mounted blades, power brooms, snow-blowers, or manually shoveled. Snowplow blades should be equipped with a rubber edge and set at 1/4" above the pavement.

Deicing - Salt may be used to melt ice if necessary, but can affect the quality and pH of water leaving the paver system and could require additional monitoring and analysis. Sand is not recommended for use, as it can accelerate the rate of clogging in voids and will require increased frequency of sweeping. Open-graded chips may used for traction when ice is present, but they will likely will require sweeping and removal in the spring.

Source: ICPI Inspectors Guide for PCIP Installation and Maintenance