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Gooderham, Aaron [EHD] <br /> From: Jim Alexander <JAlexander@wpsac.com> <br /> Sent: Wednesday, October 28, 2020 9:14 AM <br /> To: Gooderham, Aaron [EHD] <br /> Subject: Fwd:434 Dr Martin Luther King permit <br /> CAUTION:This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the <br /> sender and know the content is safe. <br /> Sent from my iPhone <br /> Begin forwarded message: <br /> From: Miriam Urena<MUrena@wpinc.com> <br /> Date: October 28, 2020 at 9:12:33 AM PDT <br /> To: Jim Alexander<JAlexander@wpsac.com> <br /> Subject: FW: 434 Dr Martin Luther King permit <br /> -----Original Message----- <br /> From: Wong,Jeff[EHD] [mailto:Jwong@sjgov.org] <br /> Sent: Thursday, September 24, 2020 4:04 PM <br /> To: Miriam Urena<MUrena@wpinc.com> <br /> Subject: RE: 434 Dr Martin Luther King permit <br /> Miriam: <br /> Correct. I accepted your rationale so I don't destroy their irrigation line, unless you think you <br /> can avoid it, then it's better to destroy that by overdrill to avoid any liabilities down the <br /> road. That said, please be aware I'm pretty stringent in making pressure grouting to work and it <br /> has to be by the book. I need completely seal interface and pressure gauge so I can verify that <br /> the grout is getting into the formation and pressurized and sustain for a certain amount of time <br /> until I feel there could be no more grout going into the formation. More importantly, I will <br /> calculate the volume amount needed not just in the casing but also the sand pack(30% of the <br /> original borehole diameter x length minus the volume of the 2" piping). There are cases where <br /> the contractor could not achieve that, and they ended up having to overdrill it in the end. Let me <br /> caution you that there were times pressure grout ended up taking longer than overdrill. So if you <br /> have any doubt you can accomplish that, especially when you think you could actually overdrill <br /> it without damaging the irrigation line to begin with, I recommend you stick with that instead. <br /> Jeff <br /> -----Original Message----- <br /> From: Miriam Urena<MUrena@wpinc.com> <br /> Sent: Thursday, September 24, 2020 12:14 PM <br /> i <br />