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Corporate Office e 1 <br /> i + X3500 American River Drive <br /> E„ ! P.O. Box 15002 <br /> A' <br /> Sacramento,Calif.95851 <br /> � (916),484-3011 <br /> w A.TEICHERT & SON, INC.` - <br /> Esfabhshad'1887.- <br /> . =December-22,,1994 I <br /> Linda Tur"katte V <br /> _Public,Health'Services <br /> - <br /> 2 7 199'4 <br /> - P.0.-Box 12009 <br /> EN"/RONMENTAL HEALTH <br /> 445 N. San Joaquin Street <br /> PERMITISERVICES <br /> .,Stockton, CA 95201 - .. . r <br /> Dear Linda. <br /> ,r :Please consider-the folio Wing."pro posal for reconstructing MW-1'3 at -103:No' WE Street " <br /> In Stockton: _ Y <br /> - w <br /> - I would like to Use MW-13 as a vapor.•extraction,point because,of;its close-proximity to <br /> _"they center of the plume and,-the boringEsarnples "showed`TPHg-at 41': BGS:` However, <br /> w {MW-1.3 4car� not presently._be�used as a vapor °extraction point because MW-13 is <br /> screened at 75' to 90"BGS and groundwater.is.at68'-BGS. -11 arh proposing the following <br /> pro'ceduresao convert-MW=13 to a vapor.extraction:well. <br /> Y <br /> i Drill out the'existing'monitor wellc <br /> Decemberas rig to 90' BGS with-8"hollow stem adgers_on <br /> y <br /> -mss v. - <br /> -Y 2 <br /> xGrout in the existing:,Well-from '65 to-90' BGS on December. 29, 1994. Let the <br /> j." <br /> _.grout set up over night _ -- <br /> 3_ Re=drill MW-13'with.,10" hollow stem augers to 65' BGS-on December 30, 1994' <br /> = .vn . SIGttECi lr ltt lVr�I itO'i���'IG►dtvi' t'37' Ge_ " "PV` t1kCaaiyuJith: 0e_vu u«:�.•, , i . 1� <br /> :65' BGS. Blank welll,casing will be installed:from`.gro_and.surface to 35':BGS. A <br /> representative._:from. Anderson ConsultingL; will=.be :'on-site `to ""insure` "proper- <br /> 1,. .-,...con.struction of-the'new vapor extractioriwell. ;r w - - <br /> 5 ; The'annular space`will.be­filled with"#3`sand to-5 above the slotted interval. - <br /> 6 . A`3' mini rr urri betonite seal will be placed above the filter pack: <br /> M 7 w The remaining-ann"ular,,space will be.filled with cement td,the groundsurface and. <br /> a traffic,rated_vault will be'installed ", : - <br /> F8j ',:The piping,from"the vapor. extractEonwell:to thesiiapor extraction system will'be <br /> ' replaced on December 30, 1994 and:the system:will.be restarted,on <br /> 6 <br />