Laserfiche WebLink
11 <br /> RAINWATER CAR WASH <br /> • Ground Water Aquifer Pumping Test Calculations <br /> Assumptions <br /> III • Pump Test No 1 extraction from EW-2 at constant ground water pumping rate of 6 0 GPM <br /> • Well EW-1 is screened entirely through First Water Zone <br /> 1 • Homogenous groundwater aquifer characteristics at wells EW-1, MW-1,MW-2 and MW-6 <br /> • The Jacobs Straight Line Method (Distance-Drawdown Method) can be utilized to <br /> 1 calculate hydraulic conductivity, transmissivity(T) and storatzvity yield utilizing draw-down <br /> versus distance on semi-loganthmic paper for each well location <br /> K hydraulic conductivity <br /> T =transmissivrty <br /> ' S =storativity <br /> Q = constant ground water pumping rate= 6.0. GPM. <br /> As = draw-down per 1-loganthzmc cycle (Appendix H) = 0.44 ft. <br /> 1 t� time of pump test (Appendix G) = 420 minutes <br /> ro — intercept of best fit line with the distance axis (Appendix H) = 140 feet <br /> . b =aquifer thickness <br /> 1 <br /> 6.0 GPM Constant Rate Pumping Test Calculations: <br /> T — 70Q--As -4 70(6 0 GPM) -- 0 44 ft = 955 ftz/day, or <br /> 1 T = 955 ft2/day x 1 gpd/ft - 0 134 ft'/day 7,127 gpd/ft <br /> ' S = T(t) - 640 (ro)Z -+ (955 ft'/day)(420 min) - (640)(140)2 = 0.032 <br /> K= T b -4 955 fl/day - 25 ft = 38.2 ft/day, or <br /> K= 38 2 ft/day l cm/s 2,835 ft/day = 0 0135 cm/s <br /> i <br /> 1 <br /> 1 <br /> Advanced GeoEAV[ronmental lo,, <br /> 1 <br /> 1 <br />