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Voice 209 468-0337 Fax 209-468-3433 San Joaquin . I <br /> Environmental Health <br /> it <br /> F Aix <br /> 1. <br /> M <br /> To: Linux Farias From: Mary Meays,',Senior RENS <br /> Fax: (510)372-91-90 522 D Pages: 3 <br /> 1 4 <br /> Phone: (510)372-9100 Date: October 31,;1997 <br /> Re: 1400 Waterloo Road CC: Fran k,Yoneshige 4(0(0 D 9 3 <br /> ❑ Urgent ❑ For Review ❑ Please Comment ❑ Please Reply ❑ Please Recycle <br /> .i <br /> • Comments: �I <br /> i4 s <br /> Linus, <br /> I am forwarding you a copy of the PHS/EHD well destruction permit #k14097 issued this date, <br /> for the six monitoring wells and one vapor extraction well. <br /> Regarding the destruction methodology for the vapor extraction well, instead of using water <br /> to hydrate the bentonite pellets, PHS/EHD will require a leankneat cement mixture. There is a <br /> concern that the bentonite may not remain hydrated since the vapor well is located within a <br /> pea gravel backfill. <br /> Additionally, please provide a more detailed description of the methodology that will be used <br /> to apply pressure to the wells that will be destroyed by first grouting from the bottom up and <br /> then.pressurizing. <br /> PHS/EHD has scheduled field inspections for November 13 and 14, 1997. If there are any <br /> changes to this schedule, please notify either myself or my supelrvisor, Margaret Lagorio at <br /> (209)468-3449, <br /> it <br /> 1 Also, I have enclosed a copy of the revised concurrence letter for the CVRWQCB which <br /> PHS/EHD requested that includes the correct site address. 'r <br /> Once the wells have been destroyed, PHS/EHD will issue the�closure letter. Thank you. <br />