Investigation fee has been paid as requested. In process of final landscaping and sweep up and dumpster removal.

Once removed ESC permit will be closed, does not affect occupancy status.

rescheduled

Fee's Due: no inspection

WIP: no esc issues at this time

Lusk Place (Vista East) construction is ongoing. Lusk Street is being used for employee parking weekdays and periodically swept on weekends. Requested that streets be swept this weekend.

The newly installed culvert drain area has been sodded over. Hillside banks were hydroseeded/tacified. No sediment runoff from area in Anniversary Inn parking lot.

No violations, spills, or discharges observed. Approved.

Work on culvert for DD3 behind Anniversary Inn is complete and dewatering is shut down to just one pump. End of pipe discharge is very clear as well as downstream from the outlet. Parking lot edges that are muddy not yet curbed have wattle sediment containment installed. DI bags on Lusk are installed at the MS4 inlets and have remaining capacity.

Lusk Street should be swept this weekend or next to remove some loose sediment/trackout when all the worker vehicles are gone. Street is not bad, just needs regular cleaning to keep up with the construction activity.

Approved, no corrections at this time. Will revisit sweeping request next week.

Dewatering is ongoing at Lusk Place. 2 pumps currently running, groundwater is looking clean and clear but one of the hose outlets was stirring up the creek bed. McAlvain crew shut off pump and changed discharge system to go through a pipe and dissipate on some rip rap. Discharge at other end of culvert under Ann. Inn parking lot looked clearer than initial observation.

Turbidity sample taken by McAlvain was at 27 NTU (50 is limit).

No trackout or discharges to MS4 system. Approved. Will begin putting in manholes next week for DD3 new culvert. Dirt to be offhauled. Will need to monitor trackout.

Check on dewatering process...

1 pump is running and discharging through a pipe to the firts culvert. Groundwater is very clear. Straw bale dissipation is still installed at the final outlet west of Anniversary Inn parking lot and is preventing sediment from being churned up.

Water looks good, no new operations started. Approved.

Dewatering for water line project is still in progress. End of pipe discharge looked very close to being over the limit for TSS so I had them divert the hose where activity is occuring to the settling pond.

Requested that discharge point be closely monitored and that turbity test results should be logged.

Will check back.

ACHD ESC Inspector reported that site was now dewatering into MS4. Upon further investigation it turned out the water was from drinking water line flushing by United Water - which is a permitted disharge per stormwater ordinance. Water was picking up sediment from street and nearby stockpile so we stopped flushing and had them run a hose directly into DI to prevent co-mingling with sediment. Change was made and resolved problem.

Checked dewatering operation and one pump was flowing and dishage looked within limits. I requested they keep logging samples and monitor. Water downstream in Ann Morrison creek appears to clear. ACHD will return for turbidity sample.

No corrections at this time, complaint issue resolved.

M

Returned to site to check status of discharge two more times after the morning. Dewatering hose was diverted to a well to prevent having to discharge into the settling pond and creek (discharge offsite) when I returned to site at 10:30 AM. The remaining water in from settling pond was continuing to drain and some sediment could be visibly seen but relatively clear. No turbidity measurement was taken.

While at site I advised Jose to begin documentation for the corrective actions taken the day before. I also refered him to report the issue to regional IDEQ surface water manager Lance Halloway. Dewatering was to continue with close monitoring.

Upon returning via Ann Morrison at 3:15 PM I observed that the creek downstream from site was again turbid up to the tennis courts and first pond.

At site two hoses were discharging into the settling pond and the water at the discharge point did appear turbid, though improved from previous day's issues. I requested that one hose be directed into a the pipe diversion set up earlier and a dissipator placed on the other still in pond. This did improve the quality of the discharge but the flow volume downstream at the discharge out of the culvert under hotel's parking was strong enough to churn up more sediment.

McAlvain was planning to shut off hoses at end of day, but I called at 4:00 PM and requested that they turn off the pumps until we can engineer or provide a way to discharge water within the WQS for TSS.

At 3:30 PM, site RP Jose called to report the discharge of turbid water into the Ann Morrison Park waterway that runs along the bottom of the Bench and into the duck pond, and eventually the Boise River by the Crab Shack/Riverside Inn.

The cause of the discharge was related to trench work for the site by United Water and a need to increase the depth of groundwater and increase amount of dewatering.

UW utilized McAlvain's existing dewatering system which had been effectively treating the discharge to low turbidity levels with 1 pump running. For this operation 3 pumps were used simultaneosly and the increased flow rate created a whirlpool in the settling pond and disturbed silts & sediment within the pond. The 3 outlet hoses into the pond did not have proper dissipation BMPs installed and amount of water flushed this turbid water downstream, overwhelming the already in place wattles and check dams and vegetation that has grown in the creek bed. It sounds like this may have been occuring for several hours before the problem was noticed. I could see the settling pond water was brown but the groundwater fwas very clear.

Corrective action taken:
1. McAlvain shut down from 3 pumps to 2 pumps before my arrival, installed rip rap and pans at the hose outlets, and staked down a GatorGuard wattle at the outlet end of the pond to increase settling time/filter the water.
2. After seeing the outflow of turbid water from site was continuing, I requested they shut down to one pump since, which they did promptly.
3. Jose took a turbidity reading around 4:35 and it was at 94 NTU, which excedes the CGP limit.
4. All pumps were shut down at that time to allow settling in the pond and stop the flow of water out of the site.

After leaving the site, I found that the turbid water had filled the creek up to behind the Ann Morrison tennis courts with turbid water. The water seems to blocked in some sort of dammed up pool behind a gated area. I did not see a flume of turbid water entering or exiting the duck pond (which is the outlet to the river).

Will return to site first thing in the morning to check situation.

Vertical construction is in progress at Lusk Place. Dewatering and diversion of seepage water is still occuring. RP Jose Bautista has a log of turbidity readings. The discharge appeared very clear with no other dectectable water quality issues. Runs into Ann Morisson ponds and stream channels. Jose stated that dewatering is occuring due to utility work to be performed by United Water on Lusk Street.

Permit is posted on trailers as well as SWPPP, wattles protect north side of site, minimal trackout. Site is in compliance with ESC condtions.

No track out or significant sediment accumulation in gutters on Lusk. Drop inlets protected, no dewatering at time of inspection. Permits are posted. No corrections at this time.

Lusk Place is in progress. Some minor trackout on street needs sweeping this week. Downhill DI's have protection. Water is still being rerouted around site. RP is taking samples as necessary

Lusk Place has about 2-3 more weeks of work until footings are complete and dewatering may cease. Currently there are 2 dewatering pumps connected to a hose with the capabilitiy to run through the a sediment filtration tank. The hose is not connected to the tank because the pH and turbidity are within the water quality standards. I visually checked the outlet for clearness and erosion at the outlet splash zone. McAlvain RP Jose has a log daily water quality measurments.

BMPs are working and regular street is being performed. A water truck was in use on site for dust suppression.

In compliance.

dewatering practices: clear disharge
no issues observed