Alert Center

July 26 - High Particulate Matter Readings

The current high and sustained Particulate Matter (PM) 10 and PM 2.5 readings which began in the afternoon on July 25 at the Boulder AIR ECC monitoring station are being investigated.

At this time, Boulder AIR experts suspect that the readings are an...

July 32 - Methane Detection: BoulderAIR ECC Air Station

The BoulderAIR ECC Station detected peak methane concentrations of 5,328 ppb on July 23, 2022 at approximately 12:07 a.m. The plume was detected for approximately 30 minutes beginning at 11:40 p.m. on July 22.

Since exposure to methane in the...

June 27 - Air Quality Detection: BoulderAIR ECC Station

The BoulderAIR ECC station detected peak methane concentrations of 5,293 ppb on June 27 at approximately 12:40 a.m. The plume was detected beginning at 7:30 p.m. on Sunday, June 26.

Since exposure to methane in the environment is not known to cause any...

June 22 - Air Quality Detection: BoulderAIR ECC Station

The BoulderAIR ECC station detected peak methane concentrations of 11,118 ppb on June 22, 2022 at approximately 9:10 p.m. The plume was detected for approximately one hour beginning at 8:30 p.m.

Since exposure to methane in the environment is not known...

May 19 - BoulderAIR ECC Station Methane Detection

The plume was detected for approximately 5 hours beginning at 3:30 am. Since exposure to methane in the environment is not known to cause any adverse health effects, there are no established Heath Guideline Values associated with methane, though it is a...

May 1 - Preliminary Air Quality Report - Ajax Kenosha Farms

The Preliminary Air Quality Report for the May 1, 2022 triggered canister at the Ajax Kenosha Farms Air Monitoring Station is available at https://trello.com/c/ttJsu6sr. Canister analysis shows continued evidence for a valid TVOC emission source...

May 18 - Repair and Maintenance to Ajax Landfill South Air Monitoring Station

Recent canister triggering events between the dates of April 28 and May 18 at the Landfill South Station was likely due to a mechanical malfunction with the individual sensor unit. This specific station was installed due to an upgrade process that...

May 8 - BoulderAIR ECC Station Fuel Detection

The ECC VOC plume event detected on May 8th at 6:05 a.m. shows a chemical signature that suggests that the plume originated from a release of liquid petroleum hydrocarbon fuel, such as gasoline or diesel fumes. During the peak, natural gas tracers, e.g....

April 3 - BoulderAIR ECC Station Methane Detection

The plume was detected for approximately 25 minutes and the elevated methane was not accompanied by other Volatile Organic Compounds (VOCs) measured. Colorado Department of Public Health & Environment (CDPHE) has been notified of the event.

Additional...

March 24 - Reports Available on Ajax Dashboard

Reports are for: Landfill North (March 2), Kenosha Farms (March 2), Landfill Northeast (March 4), Landfill South (March 4), Landfill Northeast (March 8), and Landfill Northeast (March 8). These full, completed reports are now available for viewing on the...

March 14 - Erie Landfill Northeast & North

The event at the Landfill Northeast station is part of a period of sustained elevated readings, which are being assessed to determine whether the readings are a result of instrument sensor signal shift, or an actual elevation in VOCs in the area.

The...

March 10 Follow-Up: Landfill Northeast Station

This judgement can be difficult, as the sensor on the station is responding to levels over 900 VOCs, but the CSU laboratory is only measuring ~50 in the canister. There is a possibility that real VOCs are being detected, but aren’t able to be collected or...

March 8 - Erie Landfill Northeast

This represents the third triggering event at this station in as many weeks and analysis from contracted atmospheric experts has been requested.

Additional information, including analysis of the canister, will follow as it becomes available. Analysis...

Maintenance Closure: Coal Creek Disc Golf Course

UPCOMING MAINTENANCE CLOSURE:
The Coal Creek Disc Golf Couse will have periodic maintenance improvements over the next two weeks.

Wednesday, Oct. 19-Thursday, Oct. 20: Hole #1 CLOSED for safety improvements.

Week of Oct. 24: Periodic hole closures...

MAINTENANCE CLOSURE: Thursday, April 21

These maintenance operations are weather permitting and any updates to the scheduled will be shared here.

CLOSURE: Erie Singletrack Trails

CLOSURE NOTICE: The Erie Singletrack Trails remain closed as of Monday, March 14 due to wet and muddy conditions. With additional moisture in the forecast, staff anticipates the closure lasting at least for the next weeks. Please continue to respect all...

May 22, 2023 - Street maintenance on Sheridan Parkway between County Road 4 & State Highway 7

There will be a full closure of northbound and southbound Sheridan Parkway between County Road 4 & Ridgeview Drive. However, the mill and overlay work from Ridgeview Drive southbound lanes to State Highway 7 will not require a full closure.

We would like to inform you about an upcoming street maintenance project on Sheridan Parkway between County Road 4 and State Highway 7. The project will involve a combination of full road reconstruction and mill and overlay work, ultimately providing a...

Tuesday, April 11 - Asphalt repairs in WCR5 northbound turning lane near Erie Pkwy Intersection

On Tuesday, April 11, 2023 HEI Civil will be making asphalt repairs in the WCR5 northbound turning lane near Erie Pkwy Intersection.

On Tuesday, April 11, 2023, HEI Civil will be making asphalt repairs in the WCR5 northbound turning lane near Erie Pkwy Intersection. This repair work is intended to fix asphalt failures. The work will occur between 9 a.m. - 2 p.m. and will only last one...

TRAILS REMAIN CLOSED: Erie Singletrack Trails

The Erie Singletrack Trails remain closed on Tuesday, June 6, due to lingering wet and muddy conditions. Staff will reassess the trails again tomorrow.

TRAILS REMAIN CLOSED: Erie Singletrack Trails

The Erie Singletrack Trails remain closed on Monday, June 5, due to lingering wet and muddy conditions. Staff will reassess the trails again tomorrow.

Please continue to observe fencing and closure notifications, ignoring them may damage the trail system...

TRAILS REMAIN CLOSED: Erie Singletrack Trails

The Singletrack Trails remain CLOSED as of Sunday, June 4 due to recent weather events and wet and muddy conditions. To help preserve the integrity of the trails we ask that you please continue to observe trail closure notifications, signage, and fencing...

OPEN: Erie Singletrack Trails

Erie Singletrack Trails are OPEN today, Saturday, June 3. Please use caution and avoid any lingering wet or muddy spots.

TRAILS REMAIN CLOSED: Erie Singletrack Trails

The Singletrack Trails remain closed as of Friday, June 2 due to recent rainfall resulting in wet and muddy conditions. Staff are actively monitoring trail conditions and will reopen as soon as it is safe to do so. Please avoid riding trails as this may...

TRAILS CLOSED: Singletrack Trails Closed June 1

Due to recent wet weather, the Singletrack Trails are closed as of Thursday, June 1. Please respect trail closures. Riding through muddy trails can cause more damage an increase closure times to allow for trail repairs. Staff will check the conditions...