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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

atmospheric contact with the filter pack and formation, which could alter redox chemistry of<br />

the well.<br />

Note: In wells with slow recharge rates, it may be necessary to stop the pump and allow the<br />

well to recharge in order to remain at or above the drawdown limit. If this is necessary, be<br />

certain not to allow any water in the tubing to backflush into the well and when purging<br />

recommences start at a slower rate to avoid increasing turbidity. See section on Low-Flow<br />

Purging of Wells with Low Recharge.<br />

Purging will be considered complete when a minimum of one saturated screen volume,<br />

calculated according to the formula presented in Table B4.1-1, has been removed and the<br />

groundwater quality parameters have stabilized according to the stabilization requirements<br />

(Table B4.1-1).<br />

In the event the pump seizes and locks up during purging or sampling activities and it is<br />

necessary to jiggle or move the pump within the well, the purging will be re-initiated<br />

beginning with the first step of this procedure.<br />

Low-Flow Purging with Non-Dedicated Submersible Piston Pumps in Wells with Low Recharge Rates<br />

The pump intake shall be set approximately two feet above the bottom of the well.<br />

Measure the static water level in the well.<br />

Begin purging at a rate of approximately one liter per minute or as slow as the conditions and<br />

dedicated system allow (if greater than one liter per minute) until a minimum of one well<br />

casing volume is removed or the water level reaches the pump intake, whichever occurs first.<br />

Allow static water level to recover to approximately 80 percent of its static level or for 16<br />

hours after purge completion, whichever occurs first.<br />

When sufficient time has passed, measure the water level to confirm 80 percent recharge.<br />

In the event that the pump is withdrawn from the well decontaminate the exterior of the<br />

pump and submerged portion of the tubing bundle with an Alconox ® wash and deionized<br />

water rinse. Collect an equipment blank prior to redeployment of the pump system.<br />

Set the intake of the pump at the bottom of the screened interval, pump at a low flow rate and<br />

collect groundwater quality parameters for temperature, pH, specific conductance, turbidity,<br />

dissolved oxygen and ORP at 0.25 gallon intervals. Monitoring will continue until the<br />

groundwater quality parameters have stabilized according to the stabilization requirements<br />

presented in Table B4.1-1. Note: The drawdown shall be monitored continuously during<br />

purging and shall not exceed a level less than one foot above the pump intake.<br />

Prior to collecting samples, the volume of sample and the volume of the tubing bundle shall<br />

be calculates. If the volume of the tubing bundle exceeds the volume of the samples to be<br />

collected by more than one gallon the pump may be lowered to a minimum of two feet above<br />

the bottom of the well.<br />

Kirtland AFB<br />

SOPs for Field Investigations B-112 April 2004

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