Geoprobe® DI Team Posts HPT Logging Services Specification
Cross-section of HPT logs showing HPT pressure (green) and EC. Cross sections like this are useful in high resolution site characterization (HRSC).
Hydraulic Profiling Tool (HPT) Logging is getting a lot of use these days. HPT logs are a good tool for evaluating site stratigraphy, permeability trends, piezometric profiles, and estimates of hydraulic conductivity (K). HPT logs are often used in high resolution site characterization (HRSC) projects.
In the DI Group, we often get asked to review HPT logs for consultants and site owners who have contracted service providers to perform HPT logging. Most of the logs we see are good logs and reflect good workmanship on the part of HPT logging contractors.
Unfortunately, we see our share of bad logs and it is a painful experience.
Some poor field work could be avoided through proper contract specifications for the logging service.
With this in mind we have created a sample specification to serve as guidance for those who contract HPT logging services. The document may be downloaded from the Geoprobe® website at: www.geoprobe.com/hpt-sample.
This specification covers such topics as pre- and post-log QA testing (an absolute requirement for quality field work), on-site spare parts, deliverables, and operator experience. The document is available in Word format and may be copied, modified, or incorporated into other contract specifications.
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