Agenda Package - 10-01-07 - Laserfiche WebLink

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C X lb C Background Information and Plan Purpose On April 3, 2006, Lee County (County) was verbally informed by the US Army Corps of Engineers (USACE) that the Lee County Industrial Park - Phase 2 (Park) project construction was riot in full compliance with its Nationwide 14 Permit (Permit ID #200320086). The County's construction efforts to date include a roadway and sanitary sewer to service the Park. The construction was performed in 2003-2004. An action plan to address the non-compliance was outlined in a letter dated April 18, 2006, from Lee County to the USACE. This proposed plan further details the plans and schedules to bring the Park into compliance. Action Item #1: Existing Conditions - Stream Impacts Man The Existing Cond ions act ap is rovi dd i thi package. The map shows the roadwatriR. at ear it s d temporary stream crossings for the e ovi a le sum rizing thestream impacts. A total of ten corrugated metal culverts were constructed along the roadway. Rip rap protection was added on the upstream and downstream of each culvert to help prevent channel erosion. Six of the ten culverts convey juri sdictional waters according to due USACE determination in early 2006. Three of the ten culverts were originally permitted (Nationwide Permit 14 #200320086). There were two temporary crossings made ofjurisdictional waters during the construction of the sewer. These crossings were not originally permitted. The project constriction impacted an estimated 1,336 linear feet of-jurisdictional stream. Field measurements were made of the actual length of pipe and channelization, however, an estimate had to be made of actual stream impacts because the pre-developed stream centerline is unknown. Alter a review of the non-impacted stream alignments above and below the culverts, a sinuosity of 1.2 was used to make die estimate. Action Item #2: Restore Permitted Roadway Stream Crossings The three crossings of jurisdictional waters permitted under the original nationwide permit are Culvert ID 91, 43, and 98 (per the existing conditions map). During the recent field visits by die USACE, it was determined that additional effort is needed to help reduce the overall stream impact. The following actions are proposed for these three permitted crossings: Culvert #1: • Remove rip rap from stream bottomn on upstream end of culvert. Rip rap ® may be hand placed on stream banks in impacted area only. -2-