An electrokinetic potential and geophysical technology concept for directly locating a groundwater aquifer or associated petroleum hydrocarbon reservoir fluids or brines with very high accuracy, low cost, portability, and simple operational procedures.
The seismoelectric survey is different from seismic prospecting or an electrical resistivity survey procedures, which separately register either a seismic impulse velocity or electrical resistivity sounding data in the aquifer or petroleum hydrocarbon reservoir, respectively.
DC-4500 Seismoelectric Ground-Flow Locator receives both a seismic signal and a seismoelectric signal generated by the same seismic source.
DC-4500 Seismoelectric survey can avoid a dry hole, indicates either a petroleum reservoir and groundwater immediately in real time analysis. With the reference application to locate such fluids- crude oil or natural gas , the detection of groundwater, recharge investigations, and associated salt water brines.
We can provide the following service
- Perform seismoelectric groundwater survey.
- Support seismoelectric instruments.
- Technical training in the use of seismoelectric survey.
- Research and development of seismoelectric exploration.
The DC-4500 is patented in US and China.
- US Patent (US 6,476,608 http://www.patentstorm.us/patents/6476608.html).
- International Patent ( CN 1392420A).
DC-4500 sold as ground-flow survey equipment of sub-contractor of US NAVY.
Pumping Test is the examination of aquifer response, under stress (pumping of water). Drawdown is recorded while pumping is continued at the well. Pump testing is extremely useful but expensive at the same time. It is essential to make proper planning beforehand. A professional Hydrogeologist should be present during the test, make proper observations of the well/aquifer response to pumping and interpret the data. At least one observation well is required if storativity of the aquifer is to be determined. To bring down the cost of a pump test project, an existing well is often utilized if available. “Well Tests” are short term pump tests performed by the driller on newly constructed wells.
Note: Depth to water table is also recorded after the pump is shut down. This part of the test is known as the “recovery test”. If the pump test is performed with variable discharge rate, then recovery test data provide more reliable information about the aquifer properties. It is recommended that recovery test should be continued till 95% of the pre-pumping level.
Pumping test can be of two major types:
- well test (determine well yield and well efficiency),
- aquifer test (determine aquifer parameters and examine water chemistry).
Objectives of pumping tests:
- Determine well yield. Well yield is a measure how much water can be withdrawn from the well over a period of time and measured in gallons per minute or gallons per day.
- Determine well efficiency,
- Determine aquifer parameters (Transmissivity, storativity)
- Determine water chemistry and its variability with time
- Determine the suitable depth of pump.
Observation well requirement:
In confined aquifer, transmissivity is much more important that the storativity; while in unconfined aquifer storativity is much larger. An observation well is required for the unconfined aquifer.
- Review any previous reports that may have geologic and hydrologic data for the site
- Rate of pumping should be determined based on “Step Down Pump test” for new wells.
- Notify owners of nearby wells before starting the pump test. If possible, any pumping from the nearby wells should be avoided.
- Plan water discharged during the test; make sure the discharge water is not recirculating into the aquifer being pumped.
- Record groundwater levels in the pumping and observation wells at least 24 hour before the test if possible.
- Record drawdown in the pumping well and in the observations wells during pumping and recovery.
Determine Radius of influence in a confined aquifer:
R is the radius of influence (m)
T is the aquifer transmissivity (m2/day)
t is time (day)
S is the storativity
- Water level indicator
- 0-5 min in every 30 seconds
- 5-60 min in every 5 minutes
- 60-120 in every 20 minutes
- 120-shut down in every 60 minutes
- 0-5 min in every 30 seconds
- 5-15 min in every 1 minutes
- 15-60 in every 5 minutes
- 60-100 in every 10 minutes
- 100 to 300 in every 30 minutes
- 300-shut down in every 60 minutes
Next week I am going for a 48-72 hr pump test. Just received the Aqua4Plus software, transducers and the notebook. The software looks pretty straightforward. It is free too. Set up is simple. it took me a little to figure out how to make the pressure unit in feet of water. Other than than – piece of a cake.
if any of you have used the product before, let me know about your experience with it.
Description: Aqua4Plus Version 1.9.2
Download version 1.9.2 (5.0MB)
Download Aqua4Plus Getting Started Guide (100KB)
Download Aqua4Plus Instruction Manual (1.8MB)
Water Classifications & Standards Regulations (R.61-68) (2004) (PDF) (60 pp, 560K)(Effective October 7, 2004)
These regulations establish water quality standards for surface and ground waters. Additional provisions related to groundwater, that are outside the scope of the Clean Water Act and the implementing federal regulations are included in these regulations as supplementary information.Note: EPA has disapproved the following from section R.31-38.E.14.c.9: “Implementation of the enterococci standards in NPDES permit effluent limitations shall be subsequent to EPA publishing the applicable test methods in 40 CFR 136.” Since new or revised standards are not effective for CWA purposes until approved by EPA, disapproval of this sentence, along with approval of the remaining changes related to enterococci criteria, results in the criteria being immediately applicable for all purposes under the Clean Water Act and its implementing regulations.
Classified Waters Regulations (R. 61-69) (PDF) (35 pp, 600K)(Effective June 22, 2001) These regulations alphabetically list the waters in South Carolina that have been specifically classified, gives the specified classification, any site-specific criteria, and describes the boundaries of the specific use classification and the county of location.
Source: EPA website.