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' <br /> ATTACHMENT 3 <br /> � <br /> ` <br /> GROUNDWATER VELOCITY CALCULATIONS FROM <br /> MONITORING WELLS AT THE HARNEY LANE SANITARY LANDFILL <br /> Prepared by: Mark Urquhart Date: July 8,1988 <br /> a) Calculation of gradient <br /> WELL WELL COORDINATES DISTANCE GN ELEV [L[Y DROP GRADIENT <br /> North East F/MN'1 U.S.6,S. F/MN-{ F/MN-I <br /> MW-1 3551.1 2452.9 N/A -0.5 N/A <br /> MN-2 2031,4 3076.0 1642.5 -20.4 1.9 0,00116 ** <br /> MN-3 883,7 2011.2 2703.8 '20.8 2.3 0,00085 <br /> MN-4 1347.2 942.3 2671,9 -19.6 1,1 0.00041 <br /> ** This corresponds to We general flow direction beneath the <br /> landfill, which is south-southeast. Therefore the gradient <br /> is approximately 0.0012 <br /> b) Calculation of ground-water velocity using Darcy's Law: <br /> v= ki/n Where : <br /> v= velocity of ground-mater <br /> k= hydraulic conductivity of aquifer <br /> = 0,009 cm/sec (EMCUM, Attach,) <br /> i= hydraulic gradient ' <br /> n= porosity of aquifer <br /> = <br /> 0.2 ([MCUN Attach.) <br /> Calculation Table: <br /> k i n VELOCITY <br /> (cm/sec) ([t/ft) <br /> 0.0090 0.0012 0,2 5,40[-05 cm/sec <br /> 56 ft/yr o** <br /> *** <br /> conversion factor from cm/sec to ft/yr= 1,03[+06 <br /> ' <br /> v = .009cm/oec y 0,0012 ft/ft / 0.2 ` 5.40E-05 cm/sec <br /> OR V=APPR0XlMATELY 56 feet per year <br />