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Explorations were done to a depth of 8 to 9 feet below grade, and perched <br />groundwater is anticipated in the range of 3.5 to 8 feet below grade during the wet <br />season, per Cobalt Geosciences. See Appendix B for geotechnical evaluation. <br />Project: Perez Short Plat <br />PFN: <br />Engineer: Omega Engineering, Inc. <br />2707 Wetmore Avenue <br />Everett, WA 98201 <br />Attention: Joseph Smeby, P.E. <br />Applicant: Bustard Custom Construction, Inc. <br />13016 107'h St NE <br />Lake Stevens, WA 98258 <br />Attention: Paul Bustard <br />Total site area: <br />1.21 acres <br />Offsite area: <br />0.02 acres <br />Disturbed area: <br />1.23 acres <br />New Lots: <br />6 <br />Drainage Basin Information <br />Basin A <br />On -site Developed Area <br />1.21 acres <br />Off -site Improved Area <br />0.02 acres <br />Types of storage proposed on site <br />Bioretention/Permeable <br />Pavement <br />Soil Types in area of Storage <br />Type C Soils <br />Basin Data <br />Pre -developed run-off rates: <br />2-year <br />0.051 cfs <br />10- <br />ear <br />0.086 cfs <br />50- <br />ear <br />0.12 cfs <br />1 00- <br />ear <br />0.14 cfs <br />Post -developed run-off rates: <br />2-year <br />0.090 cfs <br />10- <br />ear <br />0.15 cfs <br />50- <br />ear <br />0.23 cfs <br />1 00- <br />ear <br />0.26 cfs <br />Perez SP <br />March 2022 <br />Revised: June/August 2022 Page 4 <br />