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<br /> Mr: Harlin Knoll:',:,,,;' m
<br /> 1993
<br /> May 10,.
<br /> .., JC
<br /> .Page 3
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<br /> vicinity of boring B 2Y,to depths of 2p:feet bgs During.drilling activities, an ESE geologist
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<br /> will log.the borings and utilize a-Photoiomzation`Detector (PID} td screen soil :;.In addition
<br /> .visual'and�olfacto . :indicators will be: ' sed�to assess the presence of contaminated soil If .
<br /> at:a depth'of 20 feet bgs; soil:is found':to 6--be::impacted Based on field screening.techniques,. ;
<br /> the boiing.wih be continued to°a. epth where no apparent impact is observed or ta'ground:° 4F
<br /> water.,;:One sail boring (1VIW 4) will'be drilled to'an approximate,clepth`.of 50 feet and will
<br /> be converted to a ground:water:monitoriri'well "
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<br /> _- , Soil samples w�11 be collected during'drilling atapproaumate five''foot interval The so11`,
<br /> r borings and soil sampling will' be conducted in accordance with ESE Standar&Operating+,Yl
<br /> ' ' Procedures ;(SOE)-Not'(attached) .Based yon visual observations-and PID readings, ESE'
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<br /> will select a minimum af.two soil samples per boring Soil cuttings.will be.stockpiled qn site ' x
<br /> ,pending laboratory analysis of samplesv f' 1
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<br /> ` ESE will contract Curtis &Tompkins, Ltd {C&T);.a state certified analytical laboratory, of
<br /> f Berkeley, California; ta-perform analyses on soil.5amples collected from�.this'site forTotal.
<br /> Petroleum. Hydrocarbons as 'Diesel (TPH=D) using i EPA.1VMthod`5030/8015m .and for
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<br /> y' Benzene,Toluene;Ethylbenzene,and.,Tatal Xylenes(BTEX)i sing.EFA,Method 3550%802Q:
<br /> In'addition, :based ori discussions with Mr:Knoll`tof the;County, if:asphalt coiponents ale;
<br /> indeeo'found in the subsurface, orie "s,oif-sample from each of'the two soil borings near.B fi. `
<br /> will,also be analyzed for the Toxic'Character�stic LeachiiiiPotential (TCLP,)=for Oil and_ ,;.
<br /> ,Grease {O&G) usingaViethod 5520EF The TCLP analyses:'for OBtG`v�iiil show if asphalt
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<br /> u will leach to the`ground water. ;AIl analyses wi11'be requested on a ten day,turnaroundbasis:.
<br /> Based.on previous investigations atthe site;ESE anticipates that ground.waterwill be found' '
<br /> f approximately,35 tb.40 feet below ground.surfacer Following completion of boring MW 4
<br /> ESE will direct the conversion to a ground,water rrionito`ring',well `,'The well will be,
<br /> constructedusing4-inch diameter, schedule.40 polyvinyl chloride(PVC)ao.an approximate
<br /> 4' depfh`of.50 feet: The`well will:have a cliottom cape and a 2-foot.long silt•trap--from-50 feet
<br /> tto 48 'feet,'0.02-inch slotted PUC casing from approximately°_.4$ feet to 33 feet;(15.feet of
<br /> screen}, and blank PVC:casing firomI-33 feet deep to the,surface 'The well annulus,vsi be'
<br /> h _ packed,with No:-3.Monter`ey-.sand from-`50fee t.to 30'feet; hydrated bentonite"pellets`froni`
<br /> 30 to 2$:5 feet; and grout from 2i&5,feet to:a traffic rated well box at the surface ESE will':
<br /> develop the well by rnechanical'surging And bailing prior to.placirig the,annular seal -'These.i
<br /> a procedures are 'consistent with�ISE SOP No 2 for Monitoring) Well Installation and
<br /> Development (attached} .'The=well head will have a locking cap L4Well development`water,:
<br /> =F equipment decontamination nnsate,.will be contained nnsite,in DOT rated 55-gallon'drums'.
<br /> 4 4 ,rt pending laboratory..analysis of samples
<br /> M6 k..Sample,Ground Water`and Survey,Wells x;: t
<br /> :Approximately 72,hours"after`-well installation "ESE .will,r-eriirn to theaite to purge and.;
<br /> collect ground water samples from the four wells s ESE:will also measure'static.water levels
<br /> a .:in all four.wells in`order.t0 estimate site hydraulic gradient onitoririg and ground water
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