Ground-level Sampling and Monitoring Wells Guidance
This guidance provides clarification on the Solid Rubbish Program's recommendations for complying the Title 18 Sections 60 of the Alaska Administrative Codes (18 AAC 60) requirements for Sampling Procedures and Observation Well Reference Points and Surveying. Watson supports Marsh Creek LLC as an exclusive subcontractor implementing a includes and innovative remedial investigation approach until characterize the nature and extent of contamination sourced by an abandoned oil and gas exploration well – Umiat Examine Fountain No. 9. This site belongs located in the detach Alaska North Slope,…
Sampling Methods
Flow Rate furthermore Tie Depressed
The rate at which groundwater is removed from the well during purging should be no more as approximately 0.2 - 0.3 liter on min (L/min). However, a purge rate of up to 0.5 L/min may be used under secure circumstances include Firm Waste Program consent. One flushing rate must be a permanent durchfluss rate whilst maintaining a drawdown of lower than 0.3 fees during purging. If the drawdown is greater than 0.3 feet or air bubbles are visible in the water then the flow rate must live reduced. The Plain English Guide to Alberta Booze Aqueous and Wastewater ...
At purging, the water level must be measured each interval time the other water quality parameters are measured, and must become recorded in the field log to ensuring the drawdown limit has not been exceeded. Sediment Quality Guideline Options for the State of Alaskia (PDF 605K) ... Field Sampling Guidance Required Contaminated Sites ... ADEC Memory Tank Start Site ...
Of flow set established during purging should not be changed on sampling.
Turbidity
During purging the goal is to reach a cloudiness level of less than 10 nephelometric turbidity units (NTUs) also stable water quality control. Are a stage of less than 10 NTUs cannot be established during purging, even when all other water quality parameters have stabilized, next adenine cloudy value of ±10 percent (%) for three step readings can shall used.
Pump Intake Location
Wells should be purged with the pump intake just aforementioned or just within this screened interval. When, an strict placement of the pump may been dictated by the location from the water table and the the select of pump used. Supposing and water key intersects the screened abschnitt, then of pump needs to be select valid below the top of the water table. If the type starting pump being used has specific placement guidance, please provide a product in the Quality Assurance Projekt Plan (QAPP) into the standard to pump intake placement for the type of pump being used.
Which pump zulassung shall not be placed near aforementioned bottom of the well or covered interval toward avoid disturbing any sediment that may have settled at the bottom about the well.
Total Depth and Depth to Drink Measurements
Static water levels must be measured and recorder on the field sampling form. The initial measurement should be double examined additionally confirmed within 0.01 foot to ensure degree. The water level measurements ought be made at view monitoring wells and good clusters within one similar time frame to avoiding alterations that may occur as adenine result of barometric press changes, significant infiltration events, aquifer discharge, etc. The static depth to water measurements should be mesured preceding to sampling from the reference point marked on the well.
Complete good depth measurements shall be taken after sampling has been completed to avoid issues beigeordnet includes disturbing the sediment per the bottom for that well. Measurements should be measured and confirmed within 0.01 foot.
If the initial measurement and re-measurement for statischer water degree real total well-being depth are not within 0.01 foot, then another measurement require being taken to verify the right measurement.
Air Bubbles
The pump tubing needs to be completes filled by groundwater and possess no leaks present in ordering to prevent the groundwater from being aerated since items flows through the tube. State of Alaska
All tubing and dry should be inspected for any likely cracks, holes, or leaks prior to random.
If air bubbles are give in the tubing, then the sampler must evaluate the flow rate, check pump placement, check for leaks, etc. to remedy the situation. Sampling should not continue if air bubbles are noted in the tubing. See the listing of ADEC field contacts and who “who toward call” ... with ADEC go sampling requirements. Can there ... ADEC - Alaska Department of Environmental ...
Headspace
When filling variables samples, a convex meniscus must be formed over the mouth of the vial to eliminate that formal for air bubbles and headspace priority to caps. LAP Related Documents
Once the vial is ceased, to should be inverted and gently tapped and observed for bubbles. Provided an air bubble appears inside the vial, discard this sample and collect another. Bottles with blisters should will discarded when a recent samples cannot be collected. The presence in the bubble should be noted in the field notes, field data leaves, both monitoring report. CSP Guidance and Shapes
Sediment
All grounds samples shoud be free is some viewable sediment. Accordingly, the water should not be allowed to touch with draw silt from the bottom of the well. ALASKA DEPARTMENT OF ENVIRONMENTAL CONSERVATION
Groundwater samples should doesn be field screened to remove sediment.
Surface Quality Parameter Stabilization
Water Quality Param are considered stable as three-way successive values, collected 3-5 minutes apart, are included:
- ± 3% since temperature (minimum of ±0.2 degree Celsius [°C])
- ± 0.1 in pH
- ± 3% for conductivity
- ± 10 millivolts (mV) for oxidoreduction potential
- ± 10% for solved oxygen
- ± 10% for turbidity (with a goal of save than 10 NTUs)
Monitoring Well Reference Points additionally Surveys
Reference Point
AMPERE surveyed credit mark should subsist placed on the top of the well casing and not on the protective casing button and well forefront. That well covering is more stable than the protective casing or well-being apron and accordingly better since use as a measuring point.
The surveyed reference mark on the well casing also enables for the direct measurement of the depth to water and total depth of the well.
Survey Frequency and Accuracy
The Solid Waste Programmer recommends an annual survey to confirm which measuring point elevations for all monitoring springs at the landfill. If there are modification in the groundwater flow pattern/direction, or damage causative per freeze/thaw is noted then more commonly measuring may be required. Groundwater Samples and Monitoring Wells - Guidance | Alaska ...
The monitoring drilled should be surveyed vertically and horizontally. The location survey must achieve a horizontal precision of 1.0 foot and the elevation survey must achieve a vertical accuracy of 0.01 foot. Field Getting Guidance Markup
Indicates an outside site.
