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05 October 2000 , <br /> AGE-NC Project No. 95-0197 ' <br /> -page 3 of 6' <br /> direction'in the vicinity:ofthe site_is estimated to be.toward th`e,noith-northeast:,However,'flow• <br /> direction may be variable: „. <br /> ' 3.0. PROCEDURES <br /> ' <br /> On-25 and 28 August 2000, four soil probe borings(B-7 through B'10)>'were advanced at the.site'as <br /> part of. assessment activities related to the four former USTs. The"field4work was conducted_as" <br /> outlined in the PHS-EHD-approved.work plan dated 06 June 2000 <br /> 3:1. ' ' DMLLTNG'ACTIMMS <br /> Soil probe borings B-7 through$-10 were advanced utilizing."a vari mounted'Geoprobe!;5400' <br /> equipped with 1.125-inch diameter probe rods with an attached:2:15-inch drarriet'ef soil sampler, ' <br /> ' using"direct push"technology. Soil probe borings B-7 and B78 were advanced,vertically,to a depth <br /> of 45 feet b's B-9 and B-10'wez'e:advanced to,20:feet bs <br /> gel� g• ' ''' I! .1 A. ., r ' i•y'' <br /> Soil'Sample Collection <br /> i� <br /> Discrete soil samples were'collected at 5-foot intervals, beginning'at-5 feet bsg,'to total depth Of <br /> b6rings'B-7 and B-8:.Borings B,=9'and B-10 were not sampled Soil'samples were collected using <br /> a'Gebprobe soil sampling assembly loaded with four•pre-cleaned l'125.=,,irich'by 6-irich brass sleeves, <br /> I <br /> Soil samples were preserved by covering both'ends of the brass Isleeve with�Teflon,sheets; capping, , <br /> and sealirig,with tape. Each sample sleeve.was labeled with'soll probe bonng location, depth, time, . <br /> date andI.sampler;'s initials. <br /> Each preserved sample vitas°logged on'a chain.-of custody.forth„placed,in a chilled container and. . <br /> transpbrted to a+California'Dep artment,of He0lth Services'(DHS} ceitified'laboiatory under chain <br /> 1 <br /> of custody; selected samples were lanalyzed for: <br /> a Total Petroleum Hydrocarbo'n's as gasoline:(TPH-g)'arid diesel '(TPH-d)Iby•EPA Method'• <br /> ` 8015M0 dif ed, <br /> 1 <br /> h• - . Volatile aromatic•eompounds -'.benzene toluene ,eth lberizene 'and,total.x lenes <br /> Y >> y (B <br /> -and methyl tertiary biutyl'etkier(MTBE) by EPA'Meth6d`8020; and ' y <br /> Tertiary butanol (TBA),!dr-isopropyl ether (DTE), ethyl tert butyl ether'(ETBE) and tett ; <br /> ' amyl methyl ether(TAME); and'MTBEby I.EPA Method 8260 Modified. <br /> Advanced GeoEnvironmental,;Inc. <br /> _ I - <br /> • I 1F . `` f II . <br />