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Riverstone <br />Minimum Floor Elevation Determination <br />April 24, 2017 <br />Page 2 of 2 <br />2. Type of aquifer materials — e.g. clay, silt, sand, gravel <br />3. Information as to whether or not the water table is perched or is part of a <br />deeper, thicker aquifer system. <br />4. An estimate of the flood elevation of the pond. <br />5. The distance of the proposed floor to the pond. <br />The attached document layout these steps in detail. The document contains 6 plots <br />that must be used to determine the minimum depth to the water table from the <br />bottom of the proposed floor slab. <br />The City has performed a preliminary analysis of the project using this method. We <br />used Sheet 9 with boring locations that was provided to list existing grade, lowest <br />floor and groundwater elevations. We observed that the ground elevation listed for <br />boring 7 did not match the elevation at that location on Sheet 9. Please review this <br />log and update as necessary. Generally it appears that groundwater level is below the <br />lowest floor elevation. We did not reference the charts to make a complete <br />determination. <br />Please prepare documentation to support your request for a variance to the lowest <br />floor elevations as required by the LRRWMO. The report must include a narrative <br />of the reason for requesting a variance and an engineer's opinion on the probability <br />of groundwater entering the basement. A table that includes all of the lots with <br />basements must be part of the report. The table must list the lot and block number, <br />lowest floor elevation, nearest soil boring and groundwater elevation and applicable <br />chart number from the attached guidance document. The report will be reviewed by <br />the LRRWMO and the City and will become part of the permit memo. <br />