post rainfall inspection conducted 6/9 @ 2 PM

WIP on Teresa intersection.

Syman Crew onsite applying tacifier mulch for site stabilization. This will satisfy a requirement of the Notice of Violation posted 5/28

Observations:
- Silt fence installed on the curve of Brian Way was undercut but did capture a lot of mud behind J hook of fence. (1)
- Runooff from block 1 lot 5 has caused some erosion on the slope above the onsite stormwater pond.(2)
- There is sediment runoff occuring at the corner of La Cuesta & Hakkasan , Block 2 lot 11 (3)
- trackout on Hakkasan and common drive originating from staging area on lots 15-16 of block 2 in the SE corner of sub. (4)

Correction requests:

1. Repair or reinstall section of silt fence. Remove accumulated mud behind J-hook. Clean up loose mud/dirt in area. Consider installing check dams or velocity controls in rill leading to this discharge point.

2. Install top of slope diversion berm or other control to prevent runoff from flowing over slope to cause erosion. Fix or reseed/tacify eroded area. Repair rip rap below stormwater outlet/clean mud out of pond. Consider installing silt fence or wattle between the disturbed revegetating slope and the stormwater pond.

3. Clean up dirt on sidewalk and street. Install perimeter sediment control on low spot of block 2 lot 11 to retain or filter runoff from this area.

4. Clean up trackout from block 2 lot 16 to Hakkasan, install construction entrance or relocate staging area to prevent trackout from this area.

Emailed inspection report to Rhett.

NOV compliance date is this Friday 6/12, but will grant 1 week extension to complete correction requests in NOV and listed above.

Post rainfall turbidity testing conducted with site RP Steve and Syman Company

Prior to these samples, testing with Syman company found a descrepency between the two meters. See turbidity log in SWPPP for syman readings

3 point calibration on meter prior @ 12:05
20 NTU standard : 20.2 on meter
100 NTU standard: 95 on meter
800 NTU standard: 786 on meter

Water coming into Ridgepoint Pond from stormwater inlet pipe @12:09: 633 NTU* dirty from water line project uphill. Very low flow, from dewatering/water line break

Pond water near the Ridgepoint Pond outlet pipe 31.7 NTU

Water coming out of site final outfall before entering rip rap section & stream: 161 NTU (472 NTU less than dirty background water from Granite/Suez project; 129 NTU more than Ridgpoint pond surface water at outlet)

Downstream from site outfal rip rap 146 NTU

Ridgepoint pond water quality has been negatively effected by runoff from the Granite/Suez site. ACHD notified, should be responsible for cleaning out storm drains and replacing the geotextile, flushing the riprap.

However water for the Ridgepoint pond outlet does get dirtier by the time it discharges at the site outfall potentially due to water mixing in dirty sumps in manholes and/or a leakage of the plugged resevoir joining the bypass water flow.

Investigation in progress

BMPs installed and operable.

No violations observed, no corrections requested.

Landscaping crew onsite weeding and cutting vegetation and invasive thistle on slope next to Eyrie Way.

Post rainfail turbidity inspection conducted 4-5 PM Sunday June 7 after significant rain event

Water coming into Ridgepoint Pond from stormwater inlet pipe: 45.5 NTU

Water near the Ridgepoint Pond outlet pipe 42 NTU

Water coming out of site final outfall before entering rip rap section & stream: 218 NTU (increase 175 NTU over background water)

10 meters Downstream from site outfall rip rap: 215 NTU

Additional measurements taken offsite:

Downstream from site in creek @ Starview curve 190 NTU

ACHD stormater channel by East Parkcenter Bridge 25.4 NTU

Outlet into Walling Creek/Boise River side channel 16.8 NTU

Boise River tested upstream @ Barber Park 2.4 NTU

Inspection was turbidity testing only, post rainfall site inspection is in progress.