ARCHIVED REPORTS XR0000660 - Laserfiche WebLink

Home Browse Search

I31 August 2000 AGE Project No 96-0232 IPage 13 of 25 I are summarized in Table 4 Utilizing data collected from wells EW-1, EW-2 and MW-1, a I transmissivity value was calculated at 829 gal/day-ft, a specific yield value was calculated at 0 03 and a radius of influence was projected at 23 feet utilizing a semi-loganthmic plot of draw-dawn Iversus distance (Appendix E) Utilizing the greatest observed draw-down levels at ground water extraction flow rates of 4 GPM, 6 6 GPM and 10 GPM, a theoretical best-fit line was generated on a semi-Ioganthmic plot of draw- down versus extraction flow rates (Appendix F) Plotting the projected radii of influence(Appendix B, C and D) at ground water extraction flow rates of 4 GPM, 6 6 GPM and 10 GPM, a theoretical best-fit line was generated on a semi-logarithmic plot The theoretical best-fit line can be utilized to project the approximate radius of influence for Iknown extraction flow rates (Appendix G) 3 3 SECOND ZONE AQUIFER PUMP TESTS, 21 JULY 2000 . The fourth stage of ground water pump testing consisted of extracting ground water at a rate of 10 GPM utilizing a 4-inch diameter submersible Grundfos Redi-flo pump, after 400 minutes of ground water extraction the pump test was terminated because the 5,900-gallon Baker tank reached full capacity The pump test utilized pressure transducers deployed in wells MW-1, EW-2 and EW-3 A plot of draw-down versus time for the fourth stage pump test with data logs are included in Appendix H IDraw-down versus distance for wells MWA, EW-2 and EW-3 were graphed on semi.-loganthmic paper, utilizing the Time-Drawdown Method (Jacob straight-line method), the transmissivity and storativity was determined(Appendix E) Calculations for the pump test stage 4 are summanzed in Table 6 Ground water levels in wells MW-6B (located 73 feet towards the west) and MW-9A (located. 45 feet towards the west) appeared to be influenced during the pump test by the ground water extraction During the fourth stage pump test,the greatest ground water drawn-down was observed in extraction well EW-3 at 8 88 feet after 400 minutes of pumping operation, draw-down was observed in wells EW-1 (located 11 feet towards the north) at 0 40 feet, MW-1 (located 12 feet towards the east) at 0 40 feet and EW-2 (located 4 feet towards the east) at 0 40 feet Smaller decreases in ground water I levels were observed in wells MW-9A(located 41 feet towards the west and screened 40 to 50 feet bsg)at 0 31 feet and MW-6B (located 70 feet towards the south and screened 43 to 48 feet bsg) at 0 28 feet Results of the stage 4 ground water pump test draw-down levels are summarized in Table I5 Utilizing data collected from wells EW-1, EW-2,MWA, MW-6B and MW-8A, a transmissivity value was calculated at 1,375 gal/day-ft, a specific yield value was calculated at 0 11 and a radius of influence was projected at 33 feet utilizing a semi-loganthmic plot of draw-down versus distance ' Advanced GeoEnvsronrnental,Inc