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File#16-3813 <br /> 15 Mar 16 ' <br /> Page 2 of 5 <br /> LOT ANALYSIS WORKSHEET <br /> Section 78-330-Lot Area/Width: <br /> LR-1B Lot Area Lot Width <br /> Required 43,560 s.f. (1.0 acres) 140' <br /> Actual 20,047 s.f. (0.46 acre) 96' @ 75'/97'@ OHWL <br /> Section 78-1405 &78-1279—Retainin�Wall Setbacks: <br /> The Code states that Retaining walls which do not exceed two feet in height above existing grade, <br /> which are located within the property and at least five feet from any property line, and for which the <br /> amount of imported fill associated with the structure does not exceed 20 cubic yards, do not require <br /> a permit (failure to meet all of these requirements triggers a permit.) Because the proposed walls <br /> range between 1.5 and 3.5 feet in height(tiered walls), requiring a permit. The 1.5 foot wall is <br /> labeled as a partial in-kind rebuild and extends from the boathouse to the north property line. <br /> The walls on the south side are set back at least 12 feet from the side lot line. The walls as <br /> proposed are situated as close as 10 feet to the lake. <br /> Section 78-1680 and 78-1700-Hardcover Calculations: <br /> Retaining walls are not permitted within 75-feet of the OHWL,therefore unlike retaining walls <br /> beyond the 75-foot setback,the hardcover resulting from the 0-75' zone retaining walls is <br /> included in the overall site hardcover calculation. <br /> Stormwater Total Area Allowed <br /> Overlay in Zone Hardcover Existing Hardcover Proposed Hardcover <br /> District Tier <br /> 5,011 s.f. 4,307 s.f. 459 s.f. 4 493 s.f. <br /> Tier 1 20,047 s.f. ' 645 w/in 75' <br /> (25%) (21.5%) w/in 75' (22.4%) <br /> Applicable Regulations: <br /> Lake Setback Variance (Section 78-1279) <br /> Retaining walls are not permitted within 75' of the lake, therefore the applicant is requesting a <br /> variance.The applicant's plan involves constructing tiered retaining walls between the <br /> reconstructed boathouse and the existing lake access stair. The area between the two <br /> structures is unstable and appears to bulge toward the lake. The applicant is hoping to <br /> proactively prevent any further erosion and failure of the lake yard with tiered retaining walls to <br /> stabilize the area.The walls as proposed are less than 4' in height and are shown to be <br /> approximately meeting the required separation distance so that an engineered design is not <br /> required. If at the time of building permit the City's engineer determines engineered plans are <br /> necessary they will be required. <br /> The retaining walls are the only new hardcover proposed. The majority of the proposed walls <br /> are new;there is a small portion near the north side lot line which will be an in-kind <br /> replacement. Aerial photos and photos submitted with the boathouse building permit are <br /> attached. <br /> Hardcover Variance (Section 78-1680) <br /> The retaining walls will not result in an increase of hardcover over 25%as permitted and the <br /> tiered walls appear to be necessary to ensure stability of the slope without significant grading <br /> landward to stabilize the lake yard. The wall proposed on the north side ofthe boathouse <br />