Calibrated Test -- Geothermal Well

Bowman Consulting and Northern Virginia Drilling completed a calibrated test of the well's capacity. Today's test, with the geologist's report, will confirm the well's potential as a source of water for the geothermal system. We have requested Northern Virginia Drilling complete one additional test to determine the well's potential as an ejection well. The drillers will pump water into the well to measure the speed at which the water is absorbed into the aquifer. The School is considering an "open loop" geothermal system with one well serving as the water source and the second well serving as the ejection well.

The picture shows the drilling team reading the pump dial and a sonic water level meter. The latter instrument measures the temperature of the water (55 degrees) and the level of the water table at various pump speeds (generally around 74' below the surface of the parking lot).

FINAL REPORT Geothermal Test Well

Northern Virginia Drilling successfully installed a 4" PVC pipe in the existing well on Thursday, August 21st. The drillers estimate the flow at 120 gallons per minute, an excellent result that meets the requirements specified by our Mechanical, Electrical, and Plumbing (MEP) Engineer. The drilling equipment has been removed; some cleanup remains. Thanks to everyone for your patience.

Progress Report, Well Drilling, Wednesday, August 13th

Northern Virginia Drilling will return to School Friday, August 15th to repair the broken well lining. They will inject a mixture of concrete and bentonite to fill the hole. This material will cure for approximately three days. The full drill rig will be back on site Tuesday, August 19th to drill down through the sediment and fill material to bedrock, insert an inner liner, and again attempt to measure/test the aquifer to see if it produces an adequate water flow. The "well" is the cylindrical capped PVC pipe in the picture.

Thanks to Harrison Crecraft, Bowman Geothermal, Jack Miller, Northern Virginia Drilling, Farooq Ahmadzai, Potomac Energy Group, and School Trustees Chuck Schwartz and Winfield Sealander for their contributions.

Progress Report -- Drilling a Well

Jack Miller, President, Northern Virginia Drilling Company, and Winfield Sealander, Chair of the Capitol Hill Day School Board of Trustees' Facilities Committee review the status of our drilling project. Northern Virginia Drilling was on site Wednesday and Thursday, July 30-31 to find an adequate source of water for a geothermal HVAC system in the proposed addition to the building. John Brown, Driller, and Kent Wilkes, Assistant Driller worked with Jack on the project.

More pictures and videos of the drilling can be found at the following website: http://www.flickr.com/photos/chds/collections/72157603777742737/