- The site is steep.
- It straddles a creek that coveys stormwater directly to Lake Mendota.
- Considerable runoff enters the site from both ends of Old Middleton Rd.
Ponds still filled
Since my earlier comments on this, runoff from Old Middleton Rd into the ponds has been mostly blocked by a gravel dike.
Silt fences failed again, sediment spill into creek
Silt fences guarding both sides of the creek failed.
The first failure occurred because the stakes holding the fence were too small. Where the fence failed the first time, larger stakes were added, but not all the stakes were upgraded. So when another storm hit, the fence failed again where the smaller stakes remained. The lesson--"stakes too small"--wasn't learned the first time.
The erosion control plan states: "Do not disturb existing channel between ponds." Yet due to the failure of stilt fences on at least two occasions, two gravel dams were recently placed in the creek itself. The fence itself hasn't been repaired, at least several days after the storm.
The whole approach to erosion control at this site has been ineffective, constantly closing the barn door with gravel dams after the horse has escaped.
An opportunity missed on the south side of the project
An erosion control checklist should include: "Survey the site to determine if runoff entering the site can be diverted around the site. If it can't be diverted, determine if it can be conveyed through the site in pipes or channels, without eroding or picking up sediment."
If water entering the site is clean, then it can be dumped beyond the site--even into lakes or streams--if it is kept clean while passing through the site.
Who is responsible for these continuing problems:
Design Engineer: Lisa Coleman, 266-4093, City Engineering, firstname.lastname@example.org . No mention of the need to deflect runoff was made in the erosion control plan.
Construction Engineer: John Fahrney, City Engineering, email@example.com
Contractor: Rawson Contractors (Low bid was $1, 399, 029.85), Kenneth Servi, President, firstname.lastname@example.org http://www.rawsoncontractors.com/
Permit authority: Tim Troester, (608) 267-1995, email@example.com
Erosion Control Permittee: Signed by Robert Phillips, delegated to John Fahrney, City Engineering,(608) 266-9091, firstname.lastname@example.org
Inspector on 7/23 who missed last chance to deflect inflow: Stewart Mael, (608) 261-9695, email@example.com
Grantor of permit for construction of ponds: DNR Water Management Specialist Cami Peterson, 608-275-3208. No mention was made in the permit of the need to deflect runoff from the ponds under construction.
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