The City plans to maintain treatment BMPs within CSLTG13 (Harrison Ave) based on BMP RAM and NPDES inspections. Infiltration Basins are considered Essential BMPs and will be maintained by the City Street Maintenance crew on an As-Needed basis. Maintenance will be performed by backhoe and/or hand crew (possible CCC work) to remove excess sediment from the basin. Emphasis will be placed on restoring the soil to an infiltration rate consistent with the BMP RAM benchmark value. Perforated Pipes (modeled as Infiltration Basins in PLRM) are considered Key BMPs and will be maintained using a Vactor to remove sediment as needed.

The City plans to inspect all treatment BMPs with CSLTG13 (Harrison Ave) in accordance with the BMP RAM. Additional inspections may be performed if required by NPDES permits, or to assess performance or maintenance needs. Inspections will take place beginning in spring and will continue through the fall. The Infiltration Basin, which is the essential BMP, will be inspected according to the BMP RAM and NPDES permit. Engineering staff will use the Constant Head Permeameter (CHP) to determine the infiltration rate of the basin. Staff will also perform a visual inspection and record results with a handheld GPS unit. Perforated Pipes will be inspected multiple times per year as conditions allow. Inspections of all BMPs will take place in the late spring or early summer.

The underground perforated pipe was modeled as an infiltration basin in PLRM, based on recommendations by NHC. Since it is not possible to use a CHP on perforated pipe, or assess vegetation in an underground pipe, a stadia rod will be used and the assessment method (Settling basin) was updated in 2018 to reflect the applicable assessment method.