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<br /> 31lMarch 20Q4 _ `" !�; Y -_
<br /> - -"'-'AGE=NC Project No 06 1156 a
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<br /> The Modesto; :Riverbank and Turlock Lake Formations and overl"ymg recent alluvium'are the - x
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<br /> % principal sources=of:domestic ground water in the 13,500 sgiiare mile San;Joaquii�Valley G1.round_ _ IL T
<br /> r :Water Basin: assn 5-22 This Basin is drained= nrriarrl b the San Joaum River _Ihe closest;' � { i�
<br /> surface water:feature to theTsite xs-Frencli-Camp-Slough;loeated_approximately 1;000 feet north �yF 5 .. -
<br /> Waterufrom the'.slough.drains into'the Sanrfoaquin River Deep;Water Channel and is pnt anly:used- � -- -
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<br /> for commercial'and recreational boat' ,_ , F.- x,"
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<br /> 'Based upon gro er or rtonng well:infozmahon obtained froim sites in the area,ground water `� .
<br /> f-- flow direction.i :southeast o easternl'y and,currently occurs at a dep li,of approximately 3`0 to 40:feet h:
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<br /> I f-evt • 'bs -within un water wells The=sedimentary-umts';are-thought to be relatively horizontal~and � F
<br /> f Wrft- continuous over the areaIL. = V gJ b -
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<br /> 2:3. " UNDERGROUND STORAGE TANK REMOVAL '` N «�
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<br /> In October.1999,:three==USTs.and.associated piping were removed from the site under permit`from x
<br /> -- t, SJCEHD ;Six soil -aix ples were';collected :from tl e�UST excavation; six'so�l.samples-were -;
<br /> '!collected Ervin the dispenser island`area; and two 2 l composite soil samples were collected'from y `
<br /> the excavated (stockpiled) soil x ' , �,� _ �. ' ,
<br /> " ,� •-Total petroleum hydrocarbons quantified a5 gasoline(TPH g)were detected in one sample from It"the � ;r .
<br /> .�- disperiser island area:(sample D6) at 625 milligram perk1. ilograrr� (mglkg) Toluene, ethyl benzene `N
<br /> �_ .. Viand total xylenes.(TEX)were`detected an the same sample atLconceritrations of 6 �5 rng/kg; 373 .5 :,
<br /> . ,mg/kg acid 6F5 ng/kg;�respeetively' 1Vlethyl tertiarybutyl;ether (MTBE)was detected __UST' i ,
<br /> .S3T :excavation samples T2N, T2S and:T3N; at concentrations-of 3 26 mg/kg; 17 97;mg/kg and15 1
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<br /> .rmg/kg;respectively:'No other:target analytes-were detected"in_samples collected.during the.UST
<br /> ,'removal:Analytical results of soil�samples`colleeted during LT.ST removal i,:H4 es-are attached f
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<br /> as Appendix At r ; E x-" `� r �, �Pw
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<br /> ' -,, i Soil excavated.during removal of the USTs was placed back into thesexcavatron A `
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<br /> 3 0 SCDPE OF WORK -=� ,# t � t
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<br /> = - .;,Based'-on the,results of the-UST r'e'moval soil''sampting, an...unauthorized,release- of petroleum , =`
<br /> hydrocarbon compounds from the gasolmeUSTs-appears to have occurred at the site AGE proposes
<br /> 4 - -to collect soil and discrete ground water samples to evaluate.:the lateral and uertzcal extent of the Y
<br /> k }3 petroleum hydrocarbon impact If a signi#icant petroleum hydrocarbon impact o ground water is _ _ s `: "
<br /> encountered at;the site;a second phase of work will be performed to.install ground water monitoring ., y;
<br /> wells Therprehininary,.si1.te assessment will consist of the followmg.tasks ,.
<br /> `' r "� -._ j aAilvanced,CeoEnvironmental Tnc 4
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