| Hydrogeology & Hydrology Program | |
| Southern Maryland Project | contact: David Drummond, Project chief (drummond@mgs.md.gov) |
Preliminary data:
Completion date: May 17, 2001
Contractor: Schultes, Inc.
Borehole depth: 1650 feetWell depth: 1340 feet
Borehole diameter: 12 inches
Well diameter: 4 inches
Screen interval: 1300 - 1330 feet
Screened aquifer: Lower Patapsco formation
Static water level: 129.14 feet below surface (measured 5/15/01, 08:10 am)
A 24-hour pump test was conducted with a discharge of 70 gallons per minute (gpm), immediately followed by a 24-hour recovery test. Based on the results of those tests, the specific capacity of the well was determined to be 2.45 gpm/foot. The transmissivity of the aquifer was determined to be 22,000 gpd/ft (3,000 ft2/day) from the drawdown test, and 40,000 gpd/ft (5,400 ft2/day) from the recovery test. Total drawdown was 28.53 feet.
Aquifer intervals:
0-50 feet, Surficial Lowland Deposits
50-240 feet, Chesapeake Group
240-430 feet, Piney Point Formation
430-437 feet, Marlboro Clay
437-580 feet, Aquia Formation
580-590 feet, Brightseat Formation
590-1150 feet, Upper part of Patapsco Formation
1150-1550 feet, Lower part of Patapsco Formation
1550-1650 feet, Arundel Formation (?)
Please note that the information on this page is based on preliminary data, and hence subject to change.
For more information on field methods, please see the Data Collection section.
updated 8/6/01