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Eddy and Andrew, I have drafted two options for destruction of a nested monitoring well using PVC type casing. The first is to load each well from the top of recorded Bentonite to the bottom of the casing overlapping the gravel beds a little using a light detonation cord. A 25 grain cord is more than sufficient to provide the burst pressures necessary in a hydraulic scenario to demolish PVC pipes regardless of wall thickness. The second option is to load the deepest well with a much heavier detonation cord from the top of the first recorded bentonite layer to the bottom of the deepest setting. For this I usually go with a 100 grain cord because it is very potent for its overall diameter. Every twenty feet is almost equal to my standard booster choice for large diameter production wells. This method is popular with the Aerojet nested wells that are constructed in 2.5 inch steel casings and has worked out very well. This is also the method that I used at the Metro Air Park long before the Amazon building was built on the land. It is not often that I see nested monitoring wells outside Federal DOD sites where county jurisdiction does not often apply. However, it is a known process in Sacramento County and any of the inspectors at Sacramento Environmental Health will vouch for the method. Derek Jacks and David Von Aspern are the primary representatives that are involved in those demolitions. The samples for your specific well are attached along with the two that were submitted to Sacramento EHD for an Aerojet project I was working on earlier this year. I provided them the same two options, they chose the single line method, probably due to overall cost as loading each well requires a starter in each well. If there is anything else I can help you with, feel free to get a hold of me anytime. Cell,txt, email, doesn't matter to me, I'll get back to you as soon as I can. Thank you, Tylor McMillan Tylor McMillan's Well Service, LLC Owner/ Blaster www.wellblaster.com California Groundwater Association Secretary/Treasurer www.groundh2o.org 916-761-5224 Well S. W 4 f $' n This e-mail message and any attached electronic files are intended solely for the use of the addressee(s) named above, are confidential, and may be legally privileged. Unauthorized dissemination, distribution, or copying if this e-mail message or any part thereof is strictly prohibited. If you have received this e- mail message in error, please immediately notify us by reply e-mail and/or by phone and delete all copies of this e-mail message including attachments from your computer system.