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<br /> _ AGE NC-Pro)ect No:-99 0605 .1¢ � * -`�
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<br /> - =0n 3O.Decemb.er 1998, three USTs were removed from the site by-Stockton ServJce-Starion
<br /> - A�' ] _Equipmexxt Company;Ilrc -(SSSS9.).-0n$19_February '1=999;SSSE excavated hydrocarbon impacted_
<br /> ,� ; soil froni the former UST an dispenser area AGE personnel were on site to_coilect and:field-screen _
<br /> r .i soil'samples.and to-dire - the excavation operaE�on Six soil samples were Coll cted Exam the.floor }_-
<br /> _ ;'and sidewalis of the excavati n After completion of-the,inten :remediation,.the excavation was
<br /> 3 _ backfilled.witk�-clean fill niatenal_Based iipozr the detection.ofMTBE at conceitratroris as great as_z;
<br /> - 14 m in soil and at ci the as- eat as 18 feet`below surface-. ode. s� �'' 4
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<br /> (li b), AGrE recoYnmended
<br /> fit. er subsurface investigation at•the site-7.,o assess the,--'- TBE:impact to so�i and ground watei. The 4 „� _� h
<br /> - MTBE-analytical results ofthe sarrmples colleetcd are'shownIn Tables 1 and 2�' '-� ;t- -
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<br /> r 3,0: PROCEDiJ tES •- - a� .-
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<br /> _ �Y; ::On 20"Febnrary`.2001 :fouir..soil borings (}3 1 through B ) vciere advanced-at the;5site'as part:of the
<br /> _ site�as1. sessrnent related to the'.-. S formerly located on the site Assessment pro edures for.the site '-
<br /> W , were outlined iI Prelimina Sits Assessment.- orV,.Plan 'dafed 27 .ii1 1. � v' _ F F
<br /> ry 1 y 999, appro ed by the _ I
<br /> PHS EHD by'letter dated 09,September 19991 _ m ,,
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<br /> st r! 3 1. SOIL BORING ADVANCEMENT y,,4 � ;f Y E .A � ,�
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<br /> ,� -Soil borings B _l through B,'4 were advazrced at-the site using a CME 75;drrl �g, egwpped_with " .�
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<br /> r ; % ..8.2.5 inch. iameter hollow-stem augeriF-s hL drip, n�'and two man crew=.x ere;supp��eu�by_West { {ter. 1
<br /> Hu Hazrxrat Drillin . Au er returns enerated b diillrrr wererstored,on�srte=wrthiri Iastic 5lxeetrn ' "' i0�_
<br /> _.L _ - .pending laboratory anaIysrs a - 11 . Y >: - 7. r _
<br /> -; r Soil samples were collected ahead of the dull bit usurg'a California modified spit spoon sampler_ _
<br /> =r � 7���loaded With.three pre-cleaned 2_ -inch by6=inch larass sleeves.•Sarnples were collected-,frozn the soil =� . _��
<br /> borings at_five-foot,intervals, beginning at 5 feet bsg usiirg a,140�pound_-harnmer to-'advance the -.. .,� }
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<br /> f zsampler _ 4 - 7.
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<br /> The number of blows required to advance'theIsamplerrover-each.6=inch iricreriient of the.l,8;ureh }r' w _
<br /> t =-r� ;� 1 -sarnpling Ifitervai was.recorded.on the.boring logs 5wp—lmg equspment was washOlr ed ffi an Alconox 74.
<br /> a _ ,. ,�04 � � -{
<br /> �, solution and rinsed with water pnor'to each sax rplrng run to avoid crass-contamination _,
<br /> y-L - Sail samples were=preserved`by covenng_. e. ---ends of the leading or other selected sleeve With' " ;Y'}
<br /> �� =F ,Teflon sheets;-capping with plastic and sealing with_tape Thi samples were labeled, storedon iced Y Y j
<br /> K il �- and transported under chain of custody to-McCarnbell Analytical;Inc (MAI), a State of Calrforma g,
<br /> Department of.Health.Servrces (DHS) certified-analytical laboratory ` -- r
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<br /> _ .Y ` >� r r '' �: .I r�Advanced GeoEuviranmental,Inc , s
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