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<br /> s r Limited Subs.. ace:Assessmeht Work Plan City of Ripon/Madsen Sunrise Dairy;.Repon'G'a[�fornia r. _
<br /> ' April 15:2010 J ,, s
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<br /> Total Petroleum Hydrocarbons as diesel(TPHd)was detected'-in soil sample TW 13 at a concentration of 2,000
<br /> ppm.}and was reported as below the laboratory method reporting,lirnrts iwsairiple TM 13.and;,TE-y13 (GR 4" P Y
<br /> Report No: 25 948222 1, Underground Storage TankRemoval Son pO Mg Report dated]anuary 12,'20 10)
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<br /> WORK PLAN :.
<br /> r .To assess the vertical and'lateral extent of petroleum hydrocarbon'contammafed soil beneafh the western end of x,k
<br /> former,utiderground storagertank(UST) at,ahe subject site, GR'.propo`sesato excavate'four;test pits in the
<br /> former UST.excavdh n at the locatians.'shown:on Figure
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<br /> k To implement the proposed scope of work, GR_proposes the following four tasks i 1 r f11
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<br /> ' Task 1
<br /> �Pre-feld Activities �
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<br /> GR`will update site safety plan;'and will.giveµadvance noti a to the City of Ripon'and S7CEHD ofthe "3 z
<br /> fr sam lin date, .Under round Service Alert USA will be notified atleast•,72_hourspriorto excavating t'
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<br /> r 5 Y Task2 Test Pit Ezcavatlon t(c a4• q S� {. -^ 'tom rz f a `• S j -4.
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<br /> Prior'to excavating the test pits;the pea gravel will be removed'frorn the UST excavation GR proposes r�'
<br /> to excavate four test pits in the-western en'd"ofthe UST excavation of the following locations one'test ' t
<br /> C pit will be:at.the�locahon of soi,1 sample;TW'13;one will be approximately`$feet north of TW 1.3;one
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<br /> est-pit pit will be approximately 8:feet east:of TW=13,and one test pit will be approximately_$feet south
<br /> of'TW-13°as.shown on'Figure 2, The depth-of the test'pits'.will be approximately 18 feet:
<br /> M collect orie.soil sample from the base;•in the'center of each'oftest prts:`Thesoil.sarnples'will be collected
<br /> '`'using the excavating equiprhent..to bring soil from the base of each-'test pit to'the surface where a {
<br /> ;1 wj sample tube.is.filled by driving it into-the soil from the.excavating equipnient'.s bucket Aftcr removal 4
<br /> t ,:• .from the sampling-device,-s'air`rnple'aubes are'covered on both ends wi#h Teflon.sheeting;`capped,
<br /> {labeled,aiid�place�in a cooler with ice for preservation. A chain of custody form is initiated in,the field i -"
<br /> and accompanies the selected soil_samples to the analytics}laboratory
<br /> s` F fi The sample locations will be collected Wed, approval of S3CEHN The soil samples willhbe 1
<br /> submitted for chemical analysis as,described Task3:
<br /> , The excavated soilwill be stockpiled on plastic onsite and a 4-point composite soil sample will be Y, r
<br /> collecte&and submitted,for chemical analysis as described jif Task-,3_''�
<br /> i' Task 3 ;Laboratory:Analyses
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<br /> {F Soil samples will N submitted for cliemtcal analysis by Krff'Analytical; a=California state certified
<br /> 'Hazardous Material'Testiiig.,Laboratory''(EI:AP #2236)., Soif samples w.ill'be analyzed'for TPHd by
<br /> t =�' x EPA'Method modified'8015;and TFHg;.BTEX`and 1VItBE_by EPA Method 8260B :.Additionally,ttie L `i
<br /> ' r >`stockpiled'soil composite_sample._will be-'analyzed fortotal-Leaqd by EPA Nlethod;601
<br /> Upon receipt of analytical resuits;`GR will forward thein to the'City of Ripon and SJCEHI]for review ;
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