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EI { _Y - -}+• a L � ix a- _ Ari•Wr _�, - ``may g} k_ ' . - - 1
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<br /> ' product . 'line; overexc:avation .was approximately- 13. 1/2;,:feet
<br /> wide along .th6` east6rn�erid,_ . .6 feet wide at the western .end,
<br /> 31 eet 'long and.'5feet in depth ;:
<br /> ; Soil samples .`des'ignated "A, .H & 'C. were. collected 'from-,. the.
<br /> y` � fo'rmer fuel' Uinder.groiind. :Storagex.Tank � (USS'} . excavation ',from_
<br /> approximately. 14;. feet• :`below -grade:" and. the• sample 'collected
<br /> Y from the former` waste° oil tank exctavation (Sample designated
<br /> ` pD.) was,collected; at ''appr.oximately�`9 feet below-„grade (,figure
<br /> A . 2) xSoil. samples were collected: f.from the :backhoe. "bucket -by
<br /> ,-,
<br /> removing the * top few"Y,inclies of soilaridR pushing a ' clean,
<br /> s'ix-inch'-long;-•(two r inches ` in.. gdiameter) • brass .,•sample: "'tube
<br /> Tinto. then ,'soil un'til`f':compl°etelyx .full . The .ends; of the '.tubes
<br /> " =were`�cover`.ed 'wuith.-- teflon• tape and,sealed with:.plastic `lend
<br /> I x caps;' The'_sample5 we`re then 'labe'led ', placed -.gin: a cooler.;}with
<br /> > rce,' en,te.red on a CFiain=of=Custody form- transported either ,
<br /> to ' GTEL ' .Environmental -,.Labo'rator'y ' ° located, ,; -i-n., Concord;
<br /> t California or ` Superior`.: Precision Analytical",' located in
<br /> k 'Martinez, CaIifotnia: Both labo,ratories, used are `State-
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<br /> certified
<br /> -Stockpile Sampling
<br /> ;Stockpile .samples were-.,collected �.by Movingr. the' top : 12 to
<br /> inches: of .soil, then, pushing.a: cleans sample>Ftube into the
<br /> soil ,,::until' com letel" full :�•The',xsamples -w.ere.{ th"en seal'e'd,
<br /> t P Y. : A
<br /> labeled ' arid handl°ed., as '`described above A, discrete sample'.
<br /> i. 'was;`.collected for approximately '.everyr.l2 I,/2 cubic yards of -r
<br /> t stockpiled :'soil' and 'then °composiaed in the laboratory ,.,-
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<br /> ` 'Approximately 150 cubic' .yards . ,of stockpiled `soil that was
<br /> 3 r 3 generated ',;during the '`fuel ,- UST ,- removal as ' resampled- :and
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<br /> =designated' SP-;4a=d :arid '�P=5a�d An'd approximately -75 :'cubic
<br /> yards .o;fstockpiled;rsoll='from`.t.he product line -`excavation is
<br /> i� ,,
<br /> a represented -.by samples SP-'6a&b and SP'r"7a d (figure. 2 } ,'''
<br /> ,,,Asp .reque'srted: by''San �oaquin ''County. Public Health .Services,..
<br /> coil sampleskt. collected :from ,.the'' formerl'tu,e1.; (UST) complex 4.
<br /> ;:'excavation ,were analyz'ed- f-or soluble 16I'd -;using` deionized
<br /> 1,,w. ater '"The "Aamp1' from":the -former waste oil -ta'nk excavation'
<br /> s wa's analyzed;for;_. 80. b1 Cadmiui 'Chromiuiii:';and. Na cke'1 using
<br /> dei.onized .:water according 'to PA`,:-Method ,^6010:. " The :samples
<br /> Fco"1`lected ,at' :the bottom of the ,product : '1i .overexcav, ion'
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<br /> s :vrrere anaiy'zed ;for Benzene,, Toauene, Ethylben'e:ne and Xylenes ;
<br /> aaccording EPA " ;Method • 8020 'wand Total: . Petroleum r .
<br /> }$ Hydrocar'bons (TPfi)}�calculted� as: gasoline {f.or . PX 6 ( only) -
<br /> accord.'. toy EFA ti I�Iethod 8015 ilod famed:,. A -' copy . of= :the
<br /> ti ;:analytical laboratory r`,eportsand `Chain ody'of-Custforms '.are
<br /> piesentgd.,;in :Appendix 4A: . An ana•1'ytical .summary is found yin.. 1
<br /> r >' Table A
<br /> 1 s, f _ r •r , s" � r
<br /> t _ ? uA 11
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