7007 SEAWAY BLVD 2018-01-02 MF Import

i . I N�nar w�a�a s��w�y I Tecnporary Erosion and Sed'unentadon Control Stracegy: Exishng Control Prograe► and ContinBenc.es I 1, 'Ihe project plans and notes call fa the grading tirtrits to be fenced and the silt fencing to be plxed prior to the commencement of clearing, gcubbing, and grading BCLIVI�ICS. I2, 'Ilie intenduf straugy is to grade the farthest.d�wnslope areas according to the 3, the upper�left�part�of Drawing 4,and alo g the u�,�r pazgthof tho match line�g between Drawings 3 and 4. Those areas would be hydroseeded as soon as possible after��rading there is I complete, fa'vly early in the growing season, and t�efore grad►ng proaeds on the rema nder of the site. As designed and shown an tt�e grading�plan, these sreas would be sculpted to fonn a series of shallow clept+essions in a broad swale, sloping I gentiy towards the exisdng Narba�k Creek channel, They would be s�urou�ded during consm�ction with the silt feucing described above. By grading and hydroseeding these furthest downslope areas first, they will be avazlable and in- I place to serve a sedimentation funcdon during the consm�ction of the remainder of the project upslope. This series-of-shallow-depressions-in-a-broad-swale-backdrop will grow longer as grading,topsoil placement,fimsh grading, emd hydroseed'u.g I proceeds upsiope. Essentially, the ennre project amounts to a t�road and divetse biofiltradon facility;it provides its own biofiltration function. I Any sucface runoff from lhe to-be-gr�ded areas of the site during conswetion would have to pass successively through the downslope swale length and series of shallow depressions, through the silt fencing, and finally through undisturbed I riparian areas of varying width beEore entenng the Narbeck Creel• channel. Since site grading is direcced to occur during the dry seas.;n, little,if any, '�iu'face runoff from the graded areas is ezpected, ezcept possibly as a result of an unseasonably I intense rainstorm such as a thunderstonn. 3, The following contingencies could be undertalcen to increase the level of I sedimentaaon funetiomng of these areas as required or needed. A. Pack loose svaw(not unopened bales)along the upslape side of the silt fencing along the low secdons that cross swales. Th�s is where any surface I flow or seepag� would be passing tivough the silt fence barrier towards the existing Narbeck Creek channel. I B. Increase the depth (and thereby the volume),either temporarily or permanently, of the as-proposed shallow depressions such that they have an increased amount of dead storage with improved function as wet, water Iqualiry improvement ponds. 4. Complete the ponded areas to the west of the new Fluke access road prior to Idigging out the "deep water" sections of expanded Narbeck Swamp. These � �