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Page 3 of 5 <br /> 999 additionally , if you are granted adding this 2' of bentonite OUTSIDE of the <br /> cc at the bottom , you ' ll have to modify the drawing to reflect that. As it is <br /> in this attachment you sent, NO bentonite is shown . <br /> Your current drawing is OK fine for the EHD now-- NO bentonite outside <br /> the cc shown . either match the drawing to your narrative to add bent, or <br /> change your narrative to match the drawing . <br /> thanks . <br /> N From : Myers, Tonya [mailto:Tonya. Myers@arcadis-us.com] <br /> Sent: Thursday, March 25, 2010 3 : 55 PM <br /> To: Mike Infurna [EH] <br /> Subject: RE : WP or Chevron 94054 <br /> Hi Mike , <br /> Please find attached an updated figure detailing the well completion details . The <br /> remainder of your concerns have been addressed below. <br /> Please let me know if you have any additional questions or concerns regarding the <br /> proposed field work . <br /> i <br /> l Thank you , <br /> Tonya <br /> i <br /> From : Mike Infurna [EH] [mailto : MInfurna@sjcehd .com] <br /> Sent: Thursday, March 25, 2010 10 : 49 AM <br /> To: Myers, Tonya <br /> Cc: Evans, David <br /> Subject: WP or Chevron 94054 <br /> Tonya , David , <br /> Tonya , I dont' think I got my message across properly in our recent <br /> phone call with my concerns about the conductor case grouting . <br /> The work plan narrative section 3 . 6 . 1 calls out, "the space between <br /> the wall of the borehole and the outside of the conductor casing will <br /> p be sealed at the _base of the casing with approximately 2 feet of <br /> i bentonite chips. GROUT will then be tremied into the space to seal <br /> the REMAINDER of the casing up to approximately 1 foot bgs. " <br /> The bentonite at the bottom is really not needed since most <br /> conductor casings are installed so they end in a non -permeable/clay <br /> lense . I will allow it if you explain why you need it rather than just <br /> filling the annulus with neat cement grout . I proposed sealing the base <br /> of the casing with approximately 2 of bentonite chips to allow for an additional <br /> seal . I realize that the casing will be set in a non-permeable layer however <br /> the bentonite chips will allow for additional protection . <br /> 3/29/2010 <br />