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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

SOP B1.6<br />

Temporary Well-Point or Hydropunch-Type Sampling<br />

Temporary well-point or hydropunch-type sampling is designed to provide a groundwater sample from a<br />

designated depth or depths at a given location. The sample is obtained on the day of performing the<br />

operation leaving an abandoned borehole. The equipment used for extracting the groundwater samples<br />

consists of a drill rig, setup for hollow-stem auger drilling or other method, and a Hydropunch TM or<br />

equivalent sampling device. The hydropunch-type sampling device consists of a steel point driven by an<br />

outer steel casing to the desired depth below the base of the auger. The casing is pulled back 3 to 3.5 ft<br />

exposing the screen (stainless steel) at the driven depth through which the groundwater sample is<br />

obtained. An appropriately sized bailer of appropriate composition is used to withdraw the groundwater<br />

sample after sufficient recharge time has elapsed.<br />

The SOP for hydropunch sampling is as follows:<br />

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

In addition, samplers will don new sampling gloves at each location.<br />

Decontaminate the well-point. If the bailer is not composed of Teflon ® or stainless steel,<br />

decontamination may consist of Liquinox ® wash, potable water rinse and distilled water<br />

rinse. A chemical decontamination could adversely affect the bailers.<br />

Begin drilling the borehole, of sufficient diameter for the hydropunch sampler, by advancing<br />

the hollow stem auger to a depth less than 4 ft above the desired sampling depth. The<br />

Hydropunch TM sampler is then placed at the bottom of the borehole.<br />

Drive the well-point sampler (hydropunch) at least 4 ft beyond the bottom of the borehole<br />

(base of hollow-stem auger) to the desired groundwater sampling depth.<br />

Withdraw the outer steel casing of the hydropunch 3 to 3½ ft to allow water to flow into the<br />

screen of the sampler.<br />

Allow a minimum of 15 minutes and a maximum of 2 hours for formation groundwater to fill<br />

the inside of the screen. If 2 hours is insufficient time for enough water to enter the screen to<br />

generate a sample, remove the sampler and abandon the borehole or drill to the next sample<br />

depth.<br />

No purging will be performed prior to sampling. Carefully lower the decontaminated bailer<br />

of appropriate composition (i.e. Teflon ® or stainless steel) to the bottom of the screen.<br />

Carefully withdraw the bailer and fill the sample container. Project-specific requirements<br />

should be presented in a project-specific addenda to the QAPP. Record in log book sample<br />

depth, time of installation and filling of sample bottles, sample description and field<br />

measurements, if applicable.<br />

Preserve, cool, and package the sample bottles as required for shipment to the laboratory<br />

within 24 hours.<br />

If the last sample depth is completed, withdraw the well-point or hydropunch steel casing and<br />

abandon the borehole according to appropriate requirements. If another sampling depth is<br />

required at the same boring, remove the well-point screen and drill to less than 4 ft above the<br />

next sample depth. Repeat the above procedures for sample collection.<br />

Kirtland AFB<br />

SOPs for Field Investigations B-59 April 2004

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