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• Representative: Cape&Islands Engineering, Inc <br /> • Proposal to raze and replace existing non-compliant house with code-compliant structure <br /> • Property is 7,125 sqft in flood zone only <br /> • New house to be elevated to 13 ft (1ft above base flood elevation) <br /> • New 3-bedroom septic system with nitrogen-reducing component <br /> • Landscaping plan includes native and ornamental plantings <br /> • Concerns raised about water channelization between retaining walls <br /> • Removal of willows and an additional 4 to 5 non native trees <br /> Flood Zone and Retaining Wall Concerns <br /> • House will be underwater in Category 1 hurricane surge by 2070 <br /> • Commissioners express concerns about water channelization and erosion <br /> • Suggestion to consult coastal geologist for retaining wall recommendations <br /> • Discussion on materials for retaining wall and landscaping areas <br /> • Proposal to eliminate channels by pushing walls to property lines <br /> Technical Details and Revisions <br /> • Discussion on revegetation of certain areas <br /> • Suggestion for rain garden to reduce water velocity <br /> • Query about outdoor rinse station connection to septic system <br /> • Request for review and update of nitrogen calculations <br /> Nitrogen Calculations and Meeting Continuation <br /> • Questions raised about the nitrogen calculation methodology <br /> • Discussion on actual vs. design flow for septic system <br /> • Debate on effectiveness of water from other sources in mitigation nitrogen concentration <br /> • Continuance request to January 23 for further revisions <br /> Agent Comments <br /> • Restored lawn areas should not exceed 10%of overall lot square footage <br /> • Retaining wall proposed around mounded septic system to achieve separation from <br /> groundwater <br /> • Agent recommends the following if the commission approves this project: <br /> 1. Mitigation plantings to offset increase in driveway footprint <br /> 2. Installation of cobble apron where driveway meets the road <br /> 3. Lawn area to not exceed 10%of total square footage of lot. <br /> 4. Micro-clover lawn recommended <br /> ➢ Board of Health: New construction must meet full compliance with BOH I/A <br /> Septic Systems Regulation—floorplans for proposed new dwelling to be reviewed <br /> upon submission to Building Department. Proposed septic design plans to be <br /> reviewed upon submission to BOH. <br /> 10 <br />