Bloomfield Subdivision Site - Hydrostudy - Appendix F

APPENDIX F -WATER LEVELS AT THE COCKBURN WELL Mr. Cockburn reported that his well, which is 240 feet deep, went dry during drilling operations at the Bloomfield site and as a result of pumping at the test well on lot 22 on November 15 and 22. On the later date, GeoTrans was notified at about 11:00 am that the Cockburn well went dry after less than 3 hours of pumping had occurred and only about 150 gallons had been pumped from the well. Unfortunately, the depth to water in the Cockburn well was below 155 feet bgs between mid-day on November 21 and the morning of November 23; thus, no data are available to examine water-level changes immediately before, during, or after the November 22 test. By comparison, on November 15, while Valley Drilling pumped approximately 1300 gallons from the well between 9:00 am and 5:00 pm (see test data in Appendix C), the water-level in the Cockburn well was rising and did not decline until after the test had ended (Figure F-1). Also, as shown in Figure 12 of the hydrogeologic report, pumping at the lot 22 test well caused no measurable drawdown in nearby test wells on lots 21 and 23, and did not affect the Bigley well, which is between the test well and the Cockburn well. Furthermore, aquifer testing associated with the hydrogeologic study did not cause discernable drawdown at any of the offsite wells. The Cockburn well is approximately 1700 feet from the lot 22 test well. Given the small volume of water (480 gallons) pumped from test we1122 during the aquifer test on November 22, it would be very surprising if pumping at this well caused drawdown at the Cockburn well. Better resolution of the cause of changing water levels in the Cockburn well would be facilitated by installation of an automated water-level recording device to a depth just above the pump intake (which will require pulling and re-setting the pump). J.R. Gould Enterprises is willing to provide Mr. Cockburn with a new well if pumping at the proposed subdivision site is shown to cause his well to go `dry'. Final Hydrogeologic Sludy of the Bloomfield Subdivsion Site December 2005 22