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Home My WebLink About6. Old Business 04/21/2015Village of Mount Prospect mIntP,ir Community Development Department MEMORANDUM f TO: DAVID STRAHL, ACTING VILLAGE MANAGER FROM: DIRECTOR OF COMMUNITY DEVELOPMENT DATE: APRIL 16, 2015 SUBJECT: WITHDRAWAL OF PZ -21-14 / 2806 BRIARWOOD DR. W / VARIATION REQUEST TO LOT COVERAGE Upon further review of the Petitioner's request, it was determined that the variation request to allow an overall lot coverage of 48.07% is no longer needed. Based on the Village Engineer's review of the subject property, the wood deck is different from a typical deck in that there is no impervious weed barrier beneath it and drains directly into Lake Briarwood. Therefore, the wood deck is not considered impervious surface and should not be counted towards the lot coverage calculations. The overall lot coverage calculation excluding the deck is 44.74% and does not require a variation as it is under the 45% permitted. Consequently, the request for a variation is no longer necessary and should be withdrawn from the April 21St meeting agenda. Since the Variation request appeared before the Planning and Zoning Commission and Village Board in 2014, the Petitioner removed the wood deck and has cooperated with the Village Engineer to address concerns regarding the Village Floodplain Regulations. The attached memo from the Village Engineer summarizes what has taken place since 2014. The Petitioner would like to reinstall the wood deck. Staff has no objections to the Petitioner reinstalling the wood deck, provided it is consistent with the attached site plan prepared by George Simoulis dated 06/02/2014 and a building permit from the Village is issued for the concrete block patio and wood deck. No further permitting from any outside agency is required. Please forward this memorandum and attachments to the Village Board for their review at their April 21, 2015 meeting. Staff will be present to answer any questions related to this matter. � Jq, n - William J. Cooney, AIC' \\VCI\vhl B,in—od Dr. W(Wi(hdniw,a1dPZ21-14NAR. rcq-,s[w La[C.—age}do- Mount Prospect Public Works Department INTEROFFICE MEMORANDUM l TO- DEPUTY DIRECTOR OF COMMUNITY DEVELOPMENT CONSUELO ANDRADE FROM: PROJECT ENGINEER CHUCK LINDELOF DATE: APRIL 16, 2015 SUBJECT: PZ -14-2014; SEAWALL, PATIO & BOARDWALK (2806 BRIARWOOD DRIVE WEST In 2011, Mr. Andy Kalinowski of 2806 Briarwood Drive West obtained a permit to build a sea wall for the purpose of bank stabilization. In April of 2012, the wall was inspected and approved; no fill was placed behind the wall, and floodwaters from Lake Briarwood could freely pass through weep holes in the wall, preserving the existing floodplain storage volume. In October of 2012 Public Works approved the design for a patio to be installed along the back property line/bank of Lake Briarwood. The permit was later denied by Community Development because the proposed patio violated the rear yard setback. Although no permits were issued, Mr. Kalinowski installed the patio and the boardwalk across the top of the sea wall. In 2014 Mr. Kalinowski attempted to obtain an after -the -fact permit for the patio and deck. While the Code had been amended to eliminate the setback requirements along the lake, the patio and boardwalk exceeded the maximum allowable lot coverage. Through various discussions, emails, and meetings, culminating in a meeting on January 9, 2015 at Village Hall, attended by Mayor Juracek, Mr. Andy Kalinowski, Bill Cooney, and Chuck Lindelof, it was determined that the following issues must be explored - 1 . xplored: 1. Compliance with other agency permitting requirements (Metropolitan Water Reclamation District of Greater Chicago (MWRD) and the Illinois Department of Natural Resources (IDNR)) 2. Compliance with the Village floodplain regulations as detailed in Chapter 22 of the Village Code 3. Compliance with lot coverage restrictions as detailed in Chapter 14 of the Village Code Item 1 (MWRD & IDNR Compliance): Mr. Dan Feltes, in charge of administering the MWRD's Watershed Management Ordinance confirmed that since the work was completed before the new WMO became effective, the work is considered as "existing" by the MWRD, and so does not require a permit from the MWRD. Page 1 of 2 PZ -14-2014; 2806 Briarwood Drive West April 16, 2015 Lake Briarwood is mapped as "Zone A" on the Flood Insurance Rate Maps (FIRMs). No floodway has been established or recognized by IDNR, so IDNR does not require a permit. In lieu of determining the floodway, the Village conservatively applied IDNR's floodway regulations to Lake Briarwood. The permitted sea wall would be covered under IDNR's "Regional Permit No. 9", so no additional review or permitting was required. The boardwalk was installed on top of the wall, encroaching no further into the floodplain of Lake Briarwood than the original wall. Because the boardwalk has no impact beyond that of the original sea wall covered by Regional Permit No. 9, no additional review or permitting was required. Item 2 (Village Floodplain Compliance) : Mr. Kalinowski hired Bono Consulting, Inc. to resurvey the property, and compare the floodplain storage currently provided to that available in 2005, the date of the previous survey, and the conditions prior to the construction of the sea wall, patio and boardwalk. The survey identified the Base Flood Elevation, and confirmed that the work completed complies with the Village's floodplain storage requirements: Fill Placed = 197.16 ft3 Compensatory Storage Required = 1.5 x 197.16 ft3 = 295.74 ft3 Total Cut/Storage Provided = 420.71 ft3 > 295.74 ft3 ok It should be noted that Mr. Kalinowski removed the boardwalk in December. The survey included the ground elevations behind the seawall, and under the boardwalk, and confirmed that this area remains free of fill, and accessible as floodplain storage. Item 3 (Lot Coverage Compliance): The lot coverage restrictions consider two different issues: impact to drainage caused by the impervious surface represented by lot coverage, and the amount of greenspace on a site. A boardwalk would typically be considered as a deck. Because impervious weed barriers are often placed below decks, a deck would normally be considered as impervious for drainage considerations. However, the boardwalk in question is partly over, and drains directly into Lake Briarwood. Consequently, from a purely drainage perspective, we would not consider the boardwalk as impervious, or to count against lot coverage. We defer to Community Development regarding the boardwalk and greenspace determinations. In summary, the sea wall, patio, and boardwalk require no further permitting from any outside agency, meet the Village's floodplain regulations, and do not adversely impact the drainage of the area. Public Works has no further objections. Please feel free to call if you have any questions. Chuck Lindelof H:\Engineering\Development\Reviews\Single Family Res\Briarwood\2806 VNBoardwalk\Summary 4-16-2015.docx Page 2 of 2 ALLOW,45LE LAT COVERAGE 455yo OF LOT AREA LOT AREA 9,5218.19 SQ. FT. 4S% OF LOT AREA 09,50810 x OAS) - 4,218:6 W. FT, L LOT COVERAC-E 4,5108 SQ. FT. OWOUSE' -----------2b41Ja SQ. FT. O FRONT STEP: ----- 365 SQ. FT. l J FRONT WALK—----__19ID SQ. FT. ® DRIVEWAY: __ -----_2290 SQ. FT. O SIDE WALK--------�—___323 SQ. FT. 14 N CONC BLOCK PATIO. 2815 SQ. FT. J CONC STAIR&. —----- —__91ID SQ. FT. g CONC WALL ------------___68 SQ. FT. ® UPPER LEVEL WOOD DECK -----561.0 SQ. FT. I@ WOOD DECK —_---------311 SQ. FT. TOTAL COVERAGE AREA: 45108 SQ. FT. IATELIER DESIGN Mme -ate? S rn n u J Oy 14 N o� 2 H H n RA V. IiO. iiAts DseC�tlat IB8UE84 REv1910N8 Prolwee, —.__ LOT COVERAGE CALCULATION Addle; 2806 S. BRIARWOOD DR, MT PROSPECT, IL 60005 eheel MI., BREAK DOWN AREAS Daw, Rol. 06/02/14 No, 501.14 Dann, eh k Ne. Ton AU20TOWBKI A-1 ct..ks.* Approved, �EORaE alraw.ls