1 PURPOSE AND SCOPE
This Standard Operating Procedure SOP provides technical guidance and methods that will be used and procedures to be followed for developing groundwater monitoring wells This SOP gives descriptions ofequipment field development procedures field data collection and personnel responsibilities
The purpose ofwell development is to restore the hydraulic conductivity ofthe aquifer material surrounding the well to nearpwreell installation conditions This is accomplished by removing well drilling fluids solids or other particulates that may have been introduced or deposited on the borehole wall during drilling and well construction activities Properly developed monitoring wells allow for the collection ofrepresentative groundwater samples.
2 RESPONSIBILITIES AND QUALIFICATIONS
The Project Manager or Field Manager has the overall responsibility for implementing this SOP They will be responsible for assigning appropriate environmental staff to implement this SOP and for ensuring that the procedures are followed All personnel performing these procedures are required to have the appropriate health and safety training In addition all personnel are required to have a complete understanding of the procedures described within this SOP and receive specific training regarding these procedures if necessary.
All environmental staff and assay laboratory staff are responsible for reporting deviations from this SOP to the Project Manager or Field Manager
3 RELATED STANDARD OPERATING PROCEDURES
The procedures set forth in this SOP are intended for use with the following SOP :
- Monitoring Well Installation
- Water Elevation Measurements
- Field Equipment Calibration
- Decontamination ofSampling Equipment
- Investigation Derived Waste Management
- Purging and Sampling Monitoring Wells
4 EQUIPMENT LIST
The following items will be required to develop groundwater monitoring wells :
- Well completion logs
- Well development records see AttachmentA
- Well keys
- Stainless steel adjustable rate submersible pump controller and power source generator or battery
- Surge block
- Teflon or lTinefelodn polyethylene tubing
- Stainless steel or Teflon bailer
- Mechanical reel or tmrouunctekd wireline rig for deep wells
- Water quality meters for temperature conductivity pH and turbidity
- Plastic sheeting
- Decontamination equipment and supplies see SOPNo 10 Decontamination
- Personal protective equipment PPE as outlined in the Health and Safety Plan HSP
- Organic vapor detector on wells scheduled for volatile organics analysis
- Graduated5gallon bucket
- Drums or other large container for storing development water
- lWeavteerl probe
- Weighted tape measure
- Calculator
- New rope
5 MONITORING WELL DEVELOPMENT PROCEDURES
The initial static water level will also be measured before development begins and well purge volume requirements will be calculated
Monitoring well development will be accomplished using a surge block aonrdabailer and a submersible pump to flush the screen sand pack material and borehole wall ofdrilling fluids and fine sediment resulting from well drilling and installation activities This procedure also allows for the removal offine sediment which may have accumulated within the inner well casing
The surge block will initially be operated with short gentle strokes above the well screen intake
The surge block will initially be operated with short gentle strokes above the well screen intake
Development will begin at the static water level and move progressively downward to prevent the surge block from becoming sand locked The surge energy shall be gradually increased at each depth Surging shall be alternated with removal ofthe fines with a pump or bailer.Note that surging of pleormewability formations can result in a collapsed well screen Development of gfrianineed materials will be accomplished by a gentle action to avoid reducing the natural hydraulic conductivity
Well development will begin no sooner than 24 hours after the well as been grouted and will consist ofremoving approximately 3 to 10 well casing volumes from the well plus a volume of water equal to any additional potable water added to the borehole during drilling or well
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