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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

SOP B1.3<br />

Monitoring Well Installation<br />

Different methods exist for the installation of monitoring wells. This SOP outlines the suggested<br />

procedure currently implemented on Base that is proven reliable for successful installation of problemfree<br />

monitoring wells. Any deviations from this procedure must be addressed in the project-specific plan<br />

must include an approved site-specific SOP..<br />

The monitoring well program is designed to provide groundwater sampling points onsite as well as<br />

upgradient and downgradient of the site so that groundwater contamination may be characterized.<br />

Figures B1.3-1, B1.3-2, and B1.3-3 illustrate typical construction details for three types of monitoring<br />

wells, an overburden monitoring well, a double-cased monitoring well, and a double-cased open hole<br />

bedrock monitoring well.<br />

Monitoring Well Installation Procedure<br />

Proposed monitoring wells will be installed in accordance with the following procedure:<br />

Wear appropriate PPE as specified in the BWHSP (Appendix F of the BWP) and the SSHP.<br />

Drill borehole to the total depth using an air rotary casing hammer (ARCH) or drill rig (bit<br />

size of 8 or 10 inches). Temporary surface casing to the water table may be used to stabilize<br />

the upper portion of the drill hole, but casing must be removed as filter pack and bentonitecement<br />

grout are installed.<br />

The appropriate depth will be determined in the field and is dependent on the occurrence of<br />

significant water. If significant groundwater is encountered during drilling, drilling will<br />

cease, and the hole will be allowed to equilibrate for approximately 1 hour. If a<br />

determination is made that the upper-most perched aquifer (or regional if it is determined to<br />

be the upper-most aquifer) has been reached, well installation will be completed within this<br />

zone.<br />

Soil samples will be collected at specified intervals as detailed in the project-specific<br />

addenda. Split-spoon samples may be screened for volatile organic compounds using the<br />

real-time air monitoring equipment. Saturated soil samples may be checked for permeability<br />

in order to establish the best interval for screen placement. One sample from each well in the<br />

screened depth may be collected for geotechnical parameters.<br />

Well construction will require flush-threaded Schedule 80 polyvinyl chloride (PVC) casing<br />

and 25 to 40 ft of 0.01-inch Schedule 80 slotted screen with a 5-ft sump. The length of the<br />

screen will be determined based on pending discussion with the New Mexico Environment<br />

Department (NMED). The well diameter will be specified in the project-specific plan.<br />

For a 4-inch diameter well the borehole will be drilled with 11 ¾-inch outer-diameter drive<br />

casing to 200 ft bgs. Collect and log soil cuttings at 5- to 10-ft intervals or at changes in<br />

lithology. Cutting samples will be collected from the cyclone. Install 200 ft of 9 5/8-inch<br />

casing inside the 11 ¾-inch casing and advance the 9 5/8-inch casing to approximately 400 ft<br />

bgs. Collect and log soil cuttings at 5- to 10-ft intervals or at changes in lithology.<br />

Kirtland AFB<br />

SOPs for Field Investigations B-35 April 2004

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