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<br /> 28-iApril 1997 - =t '••;
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<br /> AGE- Project No. 96-0232 ' ..
<br /> 6 of 9
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<br /> MW-2 and'MW-4 were measured tot'' iiearest,1/100th of'a foot utilizin a Solist water level meter
<br /> t` g s ,
<br /> ReIative ground wateF elevations were,calculated by'subtracting the:depth to,grounci,watei from the
<br />' relative cosi ' elevations surve ed-'from'a'tern or • benchmark.assigned an'arbitrary r g y p g ary el'evatiori r
<br /> 1 h' w
<br /> ARelative ground':water elevations.were plotted and,'contoured an a scaled site-ma -•from which a
<br /> ground water gradient vias estimated (Figure Nos 4-&'5-Relative Ground Water Elevation
<br /> [ After'ground water 1eveIs were measured; at Ieast eight gallons of ground water,(a minimum of three
<br /> `well v
<br /> olumes) was'purged from,wells MWA, MW-2 and MW-`4•utilizin :a two-sta a su m
<br /> g .� g. , b ersible
<br /> pump."-Temperature,.pH and conductivity were measured at regUla'r'izatervals using an.ICIvI'model '
<br /> 52200 water analyzer: Stabilization data and field logs are included,iri Appendix C Purged'ground
<br /> water was'stored in 55-gallon drums stored on'-site 3n an area lacki g'public,accessible.
<br /> 1Vlorutong.wells MW-1, Ml?V 2 and n =4 were purged and allowed to recover for a n inimum of '
<br /> ' one-hour prior to�,sample collection.'Ground water, samples were?collected,'utilizin a,dedicated,
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<br /> disposable,polyethylene bailer','and neve nylon'rope: Sufficient sample'was collected from_tach well
<br /> ito fill three 40=m1 EPA-approved VOA`vials coii'taining 0.5 m1 .18% hydrochloric acid as•,a,
<br /> preservative. Groundwater sample',containers W&e'labeledwitfi the,well,designation;'date,'time;,and
<br /> samplers'initials:
<br /> 'Following.collection and Iabeling ofeach-groundwater sample, the sample was immediately placed >
<br /> in a chilled-container: Each sample'was logged on a.'chain-of-custody'form'and•transported'to, a
<br />''• California-certified laboratory for analysis of TPH-g, TPH=d;BTE&X'and MTBE-in accordance with
<br /> „ F_PA,Metho&'5030/80l,5,-an_d 602/$020. `
<br /> FINDINGS F. }
<br /> SOIL PROFILE f y
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<br />' ,-:Generally,-a' ,
<br /> I" dampfirm'to stiff pale.brown mottled gray'sandy silt`was encountered in-boring MW=4
<br /> from surface radet
<br /> bsg. Petroleum hydrocarbon odivor weal not Bete ted1duren drill countered at approximately;l,S,feet
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<br /> detected iatiI2zin a""' hoto ianizatzon[detector: g
<br /> g., P
<br /> act ivities,°nor was'organic�uapor v'
<br /> ', , -`[,- +,3 „� r_'F •J• ^ 'I �, I,,'rt `Ai I,t t _ , .j r y i •'
<br /> I4 2 ANALYTICAL+RESULTS OF SOIL SAMPLES. i{
<br /> ' . A.total oflthree so
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<br /> r �1 samples,'were analyzed by a'state=certified lab oratory.-1the laboratory ainalysis
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<br /> did not'detect any;' , siituerits of TPH-g,'BTEX orTBE'
<br /> M . The-lab oratory results (Castle.Analytical
<br /> Laboratory Reference Number 8 11)"and, chain-of custody are inducted with•Appendix'D. The'
<br /> analytical results of,the.soil'sampl'es'are summarizedAi -Table 1;
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