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3. OFFSITE ANALYSIS AND MITIGATION <br /> Total Short Plat: <br /> This short plat proposes to construct approximately 12,852 sf of New impervious surfaces. <br /> The following table summarizes the PGIS and NPGIS proposed. <br /> PGIS (sf) NPGIS (sf) Total (sf) <br /> Existing 902 2,337 3,239 <br /> Removed 0 784 • 784 <br /> Replaced 0 1,533 1,533 <br /> New 4,889 5,528 10,417 <br /> New + Replaced 4,889 7,061 11,950 <br /> Total On-Site Impervious 4,889 7,061 11,950 <br /> at Project Completion <br /> The new impervious roof surfaces on each lot for this project will be mitigated using on-site <br /> stormwater management BMPs including an engineered conveyance system with a <br /> discharge at the base on the bluff adjacent to the BNSF railroad embankment. Soil <br /> management will also be used to mitigate the portions of the site that have been graded, <br /> compacted or require soil amendments meeting BMP T5.13. <br /> Lot 1: <br /> This lot proposes to construct approximately 6,617 sf of New impervious surfaces. The <br /> following table summarizes the PGIS and NPGIS proposed. <br /> PGIS (sf) NPGIS (sf) Total (sf) <br /> Existing 902 0 902 <br /> Removed 0 0 0 <br /> Replaced 0 0 0 <br /> New 2,165 3,550 5,715 <br /> • <br /> New + Replaced 2,165 3,550 5,715 <br /> Total On-Site Impervious 2,165 3,550 5,715 <br /> at Project Completion <br /> The new impervious roof surfaces on each lot for this project will be mitigated using on-site <br /> stormwater management BMPs including an engineered conveyance system with a <br /> discharge at the base on the bluff adjacent to the BNSF railroad embankment. Soil <br /> management will also be used to mitigate the portions of the site that have been graded, <br /> compacted or require soil amendments meeting BMP T5.13. <br /> • <br /> Robinett Short Plat 15-0403 <br /> Revised:April,2016 Page 6 <br />