STORM DRAIN INLET FILTER OPERATIONS & MAINTENANCE INSPECTION PROCEDURE

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DRAINAGE REPORT for

STORM DRAIN INLET FILTER OPERATIONS & MAINTENANCE

INSPECTION PROCEDURE

Inspection of the Storm Drain Inlet Filter shall be conducted visually with the storm drain grate removed. The locations of each of the installed Storm Drain Inlet Filters are identified in Attachment A. All work shall be done in accordance with State of Hawaii Department of Transportation (HDOT) Highways Division Permit for the Occupancy & Use of State Highway Right-of-Way. The inspection procedure is listed below:

Prepare the Storm Drain Inlet Filter Inspection Form by completing the necessary information. A template is provided in Attachment B.
Photograph the initial condition of the Storm Drain Inlet Filter.
Remove and dispose of all debris that has accumulated inside the Storm Drain Inlet Filter and is covering the screen at the bottom of the inlet filter assembly.
Remove the hydrocarbon boom that is attached to the inside of the Storm Drain Inlet Filter assembly. Examine the condition of the hydrocarbon boom and note if the boom is damaged or discolored by contaminates on the inspection form.
Remove the screen covering the filter media compartment.
Assess the condition of the filter media. Indicate if filter media is discolored by pollutant saturation, sediment laden, or damaged on the inspection form.
Photograph the condition of the filter media. If the filter media is layered, the photograph taken shall accurately show the condition of each layer of filter media.
Review the Storm Drain Inlet Filter structure(s) for damage. Note any damage to the structure components on the inspection form.
Indicate if the sealant around the top outer edge or along the middle seam of two adjacent grate inlet filters is damaged on the inspection form.
Re-install the filter media compartment screen, petroleum boom, and inlet grate.
Indicate if maintenance is needed on the inspection form if any one of the conditions below exist:
- Missing or damaged structure components.
- Discolored filter media.
- Damaged sealant.
- Hydrocarbon Boom damaged or discolored.
Finalize the inspection report after all of the inlet inspections are complete.
Submit the completed inspection report and all associated pictures to HDOT Highways Division.

STORM DRAIN INLET FILTER OPERATIONS & MAINTENANCE

MAINTENANCE PROCEDURE

Maintenance personnel should wait at least two days after the most recent rain event before attempting to repair any damaged Storm Drain Inlet Filter. Components requiring maintenance shall be indicated in the inspection form provided by HDOT. All work shall be done in accordance with Hawaii Department of Transportation (HDOT) Highways Division Permit for the Occupancy & Use of State Highway Right-of-Way and 2005 Standard Specifications for Road and Bridge Construction as amended. The maintenance procedure is listed below:

Structurally damaged Storm Drain Inlet Filter units shall be repaired to their original operating condition or removed and replaced. The replacement unit shall perform equal or better than the existing Storm Drain Inlet Filter to be replaced. The new Storm Drain Inlet Filter shall be installed per the Manufacture’s recommendations. The existing and damaged Storm Drain Inlet Filter shall be disposed of per the manufacturer’s recommendations. The inlet shall not be left unprotected for any length of time.

Remove and dispose of all debris that has accumulated inside the Storm Drain Inlet Filter and is covering the screen at the bottom of the inlet filter assembly.
Replace hydrocarbon boom if discolored by contaminants or damaged with BioClean© BioSorb Media Filtration Storm Boom or approved equal. The hydrocarbon boom shall be fastened in the original location in which it was removed with Black, UV Resistant cable ties with a minimum tensile strength 50 lbs. The unusable hydrocarbon boom shall be disposed of per the manufacturer’s recommendations.

If necessary, repair the sealant around the top outer edge or along the middle seam of two adjacent grate inlet filters with Sil-Flex (RTV 7500) or as recommended by the Manufacturer. All areas where two pieces of metal interface or there are visible gaps shall be sealed.
Remove and dispose of all damaged filter media. The replacement filter media shall be BioClean© BioMediaGreen Multi-Layer Filter Media or approved equal. The new filter media shall be installed per the Manufacture’s recommendations. Waste filter media shall be disposed of per the manufacturer’s recommendations.
Document all maintenance activities for the current maintenance period on the Storm Drain Inlet Filter Maintenance Log Form provided in Attachment C.

STORM DRAIN INLET FILTER OPERATIONS & MAINTENANCE

ANNUAL REPORT

In accordance with the Memorandum of Agreement among the Advisory Council on Historic Preservation, Federal Highway Administration, and the Hawaii State Historic Preservation Officer, The State of Hawaii Department of Transportation - Highways Division shall furnish an annual report to the National Park Service that summarizes actual maintenance of the Storm Drain Inlet Filters located from Project Baseline Sta. 1120+88 to Sta. 80+50, see Attachment A. Form templates to guide inspection and maintenance staff in providing the information required in the annual report are attached. Required information is as follows:

Drywell location
Date Drywell was Inspected
Inspection Comments
List of Maintenance Performed
- Drywell location
- If filter media is replaced, date of replacement
- If filter media is replaced, condition of filter media that was replaced.
- Comments

The report shall be submitted annually to the National Park Service no later than December 16 of each year and made available to parties of the MOA and NHOs that participated in the consultation process. The annual report shall include copies of the following forms indicating work completed during the current maintenance period:

Storm Drain Inlet Filter Inspection Form (Attachment B)
Storm Drain Inlet Filter Maintenance Log Form (Attachment C)
Storm Drain Inlet Filter Media Replacement Log Form (Attachment D)

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