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SunwoodDriveΑStreetImprovements <br />Ramsey,Minnesota <br />NTIProjectNo.16.61770.100 <br />GROUNDWATERISSUES <br />Thefollowingpresentsadditionalcommentandsoilspecificissuesrelatedtomeasurementof <br />groundwaterconditionsatyourprojectsite. <br />Notethatourgroundwatermeasurements,orlackthereof,willvarydependingonthetimeallowed <br />forequilibriumtooccurintheborings.Extendedobservationtimewasnotavailableduringthe <br />scopeofthefieldexplorationprogramand,therefore,groundwatermeasurementsasnotedonthe <br />boringslogsmayormaynotaccuratelyreflectactualconditionsatyoursite. <br />Seasonalandyearlyfluctuationsofthegroundwaterlevel,ifany,occur.Perchedgroundwatermay <br />bepresentwithinsandandsiltlensesbeddedwithincohesivesoilformations.Groundwatertypically <br />existsatdepthwithincohesiveandcohesionlesssoils. <br />Weanticipatethatasystemofsumppitsandpumpslocatedoutsideoftheexcavationareaswould <br />besuitableforcontrolifgroundwaterweretobeencountered.However,awellpointsystemwould <br />bemoresuitableforcontrolofgroundwaterifexcavationsweretobeadvancedintotheground <br />watertableatdepthinfreedraininggranularsoils.Additionally,wecautionsuchseepagefromsuch <br />formationsandanywaterentryfromexcavationsbelowthegroundwatertablemaybeheavyand <br />willvarybasedonseasonalandannualprecipitation,andgroundrelatedimpactsinthevicinityofthe <br />project.Thegroundwatersurfaceshouldbemaintainedaminimumof2feetbelowthebottomof <br />theexcavationatalltimes. <br /> <br />