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1 <br /> Cr 04kal rec"a I/M Page 4 <br /> Groundwater Momtoring Report <br /> Project No 989 2 <br /> November 18,2004 <br /> ' 41 feet bgs The laboratory data is included in Appendix C of the 3'd Quarter 2004 — <br /> Groundwater Monitoring Report dated October 4, 2004 <br /> ' The following conclusions were formed based on the equation <br /> v=Kiln <br /> ' • v=average horizontal groundwater velocity <br /> • K=average hydraulic conductivity <br /> ' • 1 =average hydraulic gradient(site-specific average is 0 0065 ft/ft) <br /> 9 n=effective porosity <br /> ' 1) Analysis of the 21-feet bgs sample indicates an average K value of 6 87E-07 cm/sec and <br /> an average effective porosity of 0 3917 The average horizontal groundwater velocity(v) <br /> is estimated to be 0 012 ft/yr <br /> ' 2) Analysis of the 26-feet bas sample indicates an average K value of 1 17E-07 cm/sec and <br /> an average effective porosity of 0 3811 The average horizontal groundwater velocity(v) <br /> is estimated to be 0 002 ftlyr <br /> ' 3) Analysis of the 41-feet bgs sample indicates an average K value of 6 28E-07 cm/sec and <br /> an average effective porosity of 0 4238 The average horizontal groundwater velocity (v) <br /> is estimated to be 0 01 ft/yr <br /> 2.0 GROUNDWATER MONITORING <br /> ' 2.1 Groundwater Sampling <br /> ' On October 13, 2004, Dei-Tech Geotechnical Support Service personnel arrived on-site, <br /> opened the wells and measured the depth to water with an electrically actuated sounding tape <br /> The water level reading was recorded to an accuracy of 0 01 foot If free-floating product had <br /> been suspected, a clear disposable bailer would have been used to gauge the interface No <br /> floating product was observed during this sampling event. <br /> ' Stagnant water in the well casing was purged using a centrifugal pump with dedicated tubing <br /> The rate of well purging was monitored The wells were purged of at least three casing <br /> ' volumes and until the groundwater parameters (temperature, conductivity and pH) had <br /> stabilized (Appendix B) indicating that water representative of actual aquifer conditions was <br /> entering the well Groundwater parameter stabilization was characterized by three successive <br /> ' readings within 10% <br /> All water removed from the monitoring well and not used as a sample was placed into a 55- <br /> gallon DOT approved container that was properly labeled and temporarily stored on-site <br /> The groundwater samples were obtained utilizing a Waterra®-style foot valve and dedicated <br /> tubing Extreme care was exercised while collecting samples to prevent agitation of the <br />