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<br /> Ms Margaret Lagono '
<br /> hP"IIF IIEIhJlwi9lr 4111 tll " i I I 1 ,a, nl, 1 I ,I'I I I t n' I' Int n I I� 'I '"aEl"' 1�1'1 II,i,nn1
<br /> I 9 n 4111 i October 10, 1994 .
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<br /> IIPY ,iI 1 ; Illi"' 1 Rainbol's ,10,000-gallon diesel-fuel tank and two 6,000-gallon gasolineitanks were located,lll,
<br /> IIII l l l l l r,'il 1 m
<br /> i,i1u`I'il 'p '11 near the southwest corner of the main buildingEarth Grains UST,,a 20,000-gallon 1 11 11'1 PIJ, "
<br /> ill I n111 1111'IIII, I ,
<br /> I 111 rill IiU 1311 1!1111 ', ' , �I, VIII� 1!rli I I I I 114Ji 111, III 11
<br /> ,I ill 1111 I➢,11,1n diesel-fuel tank, was located in the parkzng lot on the east side of the facility FI ,II FI' 'uE„111 I;gIIIE 11 °"
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<br /> ' I itdi ' ''I Rainbo's gasoline tanks were removed in April 1987, The easternmost gasoline'tank had��1111,""'1'>i .II+'I1,1R ' II!`IIE IfI 11' 11114 II IEl E I II5FpIli
<br /> b 161[4,1111111IN1y�"�i'I' i4 r previously been abandoned m place, prior to 198f, byIremoving the fuelland filling'the I" 11'1tIg1 1 1� 1111'�;l all
<br /> tli
<br /> �1 ' tank with sand The two diesel-fuel USTs were removed tn'September 1989 I;" Iv'"E 1 "' °'
<br /> 1,lit ILP Iuu111 11, 111 i I,I 1 I I 1 , , , F ' I 11 it IE' Ii,il u I III IY,nl 'n
<br />�11 I'} In 1111 IIll 1'1 Pd I I 11 I 1 , !! "' 'I I 'I I II II ' 1 1,11 11111 Oil €
<br /> 11111,11 II I Irl The westernmost gasoline tank failed a tank integrity test,in!December 1986 nil i1 a1�',r1
<br /> ,f 11 nip II 11 {III 111, I ' 1 I, r ,irtl I It[ IJ ,P
<br /> ynll+1' ;1111,11` i!Ir!' rill I A roxlmatel 450 cubic yards of soil was excavated duringremoval of the'two USTs in !,' Ii11;
<br /> 11311'1 i lIf 1111' I'4 ' !1 111
<br /> , 'r:1 1, s1 1 1987 of which a roxima el 120 cubic ands was tm actelb asoline The soil was; E ' I J I 1i
<br /> „n pp Y Y p Y g
<br /> 1 1 t 11 1 'Itli lltl , I
<br /> d; 3 �1 disposed'of onsite,with guidance from the San Joaquin Air Pollutlon'Coritrol District' , 111 'II 11,h1!11 11'1 I IJ
<br /> 1,1 1 III It II
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<br /> , ' J I ' I'Ildl ,Y li'nl II 1 , 1 I!„ I I,�11l�k it IiiE
<br /> "'I''III' III` In Jul' and Se temlaer 1987 Environmental Science"and,En ineenn Inc"installed three III n4nn '�F 9I,�,,,,,,,,,
<br /> r11
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<br /> ' IIP Ill 111111 E'I ' 1 i r n, II II ' PI I EI I1;
<br /> groundwater monitoring wells (MW-1 through MW-3) In January 1988, Anderson „
<br /> '" " Consulting Groupl(ACG) installed wells MW-4 and'MW-5 ACG installed'wells MW-"6 I i'Ii';' 1111 I 111
<br /> I IL Fil♦11 nliv II '1'
<br /> I I
<br /> I' and MW-7 in'Febru 1990, and MW-8 in,Se terriber'1990' ACG had been erfoi-nim ' i;� n II�1191'II 111
<br /> da i,n1 411:!111 t 11 nn February p , p g 1 'Irl p 1 ,
<br /> routine monitoring at the facility'Isince 1990
<br /> 1
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<br /> In March 1994, Burlington installed wells MW-9 through MW-13 in five'boreholes that, 1 ,
<br /> were'drilled at the facility Soil samples were collected from the boreholes for chemical "
<br /> +I u 1 II i I " '
<br /> Jill
<br /> an�lsis Soil sample
<br /> on concentrations were,all
<br /> 111 1111 detect on limits witch the exception of the 60- foot depth sample ofrom borehole MW a 3,
<br /> l 1' JY J which contained 10 micrograms per kilogram'(µg/kg) of benzene I This sample was
<br /> I I
<br /> °'+all I1 " III collected at a depth dust below the'groundwater table, and was�probably;contaminated by
<br /> �
<br /> 1 1 lu ,m I n, + , ,
<br /> Y'u I'1° ; , hydrocarbon-impacted groundwater at that location
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<br /> I 111i1i ,, ; , I ,Groundwater sample" also collected and analyzed ',The'concentrations oflEtotal , ,,,,111 ;.Ili11l'
<br /> i1 i111�, III '" volatile-hydrocarbons,as gasoline TVH=G in then roundwater samples ranppedllfrom! "I' ' 11 I1L 11 ' Illi ILI
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<br /> " Ill "'''below laboratory Imethod detection limits to 69,000,micrograms'!per lterlll(µg/L) Benzene ill 11 a 31
<br /> Y1711 III It 1 1 IU 1 11 I 1
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<br /> I. Will, F 11'Ill Ill Ill 11!, Irl 'concentrations ini,the,groundwateil samples'ranged lfrom'below laboratory method I,
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<br /> Is �'1 'il'I 11"" ' '"' 'll, detection l limits to 2,0001'µg/L I,Phase;separated rhydrocarbonsl(PS H)'liave not been)"
<br /> 1 1111 I,IL II 1' i'!I I i 1 1' 1 1 1, I III'I ', r1 l+' 1 1 I�l i lI i Ill U 1I h 111111 ' oI n G t
<br /> 1111'' II Il d1I` liti 3111 I II I I 1 , 9 +1' Jk n
<br /> 11 detected in'any of the facility wells i lI 1 1 I II 1l IIII' 111
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<br /> 11 Burlington hasNsiibmiittled1, Remediatilon,Syslem Ptlot Test Workplan,llldated'July 1,I 19194,11 y 31 1,11
<br /> to the'SarilJoaquin:County Environnieiital Health Division describing proposed'
<br /> II In I In nw n' 111n m 1 r II , I JI
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<br /> ill , tlllgroundwater cleanupatechnologies hrI 'E ese technologies include groundwater sparging I'"IJ,
<br /> 111 Y,'11,9u 1111 1 1 3 T 1,
<br /> Jr' ,r,.,,�t !.tL 'l I,ly„ v.- °k Ir 111 I'� I I 1
<br /> rl IIE"' "'I'IIj'II' i 1 combined withl'soil Venting , With,workplan approval by 'the County,'lBurhngton
<br /> subsequently installediaIsparge " e''lll`"ndlltwo,piezo'rrieters�forill 11 lthelpil'ot' test onI �` '1 �!!1 ill I'll' I.
<br /> ,'11
<br /> ' " September 141and'ii15 1'1'994 , The:pilot'testlin'Itentatively'scheduled'forlmid-October 1994 ""E' "
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<br /> I 9 m I l o I I n Burhn tonl'Env,ronmental Inc I „ u IIII 1191
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<br /> 'Jill 111 LII w 1 1 E! 1"I'I l" ' ' 1�' 1 d 11 11
<br /> 1I II J ' 5901 Chr9st>e Avenue 1.111 Su>te 5Q1 Emer elle,CA 94608 it '
<br /> II ' 1 II E I 11 I III 1 1 I II Ii t 41 -41111I
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<br /> I 174 9111[ ' ! I 191 411
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