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Bryce stated coated bentonite for sealing between significantly different lithological layers will be used at about 800' <br /> bsg or deeper, but uncoated chips might still be appropriate. Please specify at what depth coated bentonite <br /> versus uncoated chips is to be used in writing, and provide the product's manufacturer recommendation (or <br /> relevant published document)to demonstrate uncoated chips is still appropriate at that depth. <br /> Boring diameter will be measured to high precision using special caliper in order to calculate the amount of <br /> bentonite needed for the sanitary seal volume between wells. <br /> Please discuss when DWR and GEI consider a lithological layer to be significantly different enough to warrant <br /> sanitary seal to prevention communication between layers (i.e.thickness of the clay or low permeable lens). <br /> EHD is required to ensure consistency between your proposal to ensure <br /> Please provide manufacturer's recommendation or product cutsheet on the expansion potential of bentonite chips <br /> to be used (preferably including temporal rate of such expansion). EHD prefer to see actual reference rather <br /> than from an open source such as Wikipedia (no offense to Richard nor Jimmy Wales v ) <br /> (I was under the impression that this email went out yesterday after hours but looking on my iPhone this <br /> morning there's no record of it being sent. It could just be a delay. But I'm sending it again. It may be a double if <br /> the original gets send later) <br /> From: Shatz, Richard <RShatz@geiconsultants.com> <br /> Sent:Tuesday, August 22,2023 2:38 PM <br /> To: Wong,Jeff[EHD] <Jwong@slgov.org> <br /> Cc: Russell, Bryce@DWR<Bryce.Russell @water.ca.gov> <br /> Subject: Bentonite clay swelling potential <br /> I am glad that my memory still is strong. Below is a quote and reference to the bentonite clay swelling potential. <br /> "As a swelling clay, bentonite has the ability to absorb large quantities of water, which increases its volume by up to <br /> a factor of eight." <br /> https://en.wikipedia.org/wiki/Bentonite <br /> Richard Shatz, C.E.G 1514, C.HG 84 <br /> Principal Hydrogeologist <br /> onsultants <br /> {:un3u�lin �_u -r�ccrx Sc 4�iruli:�r� <br /> GEI Consultants, Inc. <br /> 2868 Prospect Park Drive, Suite 400 � Rancho Cordova, CA 95670 <br /> T:916.631.4566 M:916.599.4630 F:916.631.4501 <br /> www.geiconsultants.com I ward I map I Linkedln I Twitter I Facebook <br /> 2 <br />