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<br /> Wells MW-1 and MW-2'are 'screened betwecn34 an 5 wells 1VIW-3RMW-4arid M
<br /> W7
<br /> are.screenedbetweert,30 and 50 feet,b§g,'�Wells-MW-6 A�nd'MW-1`are screened between 25 arid 45`'
<br /> fI s o'f
<br /> eet'bsg.-GTound water-is more than, 10 feet'dbov&ihe'tops o th -;§&ee'n'cd1ntefva1 wells'MW l'
<br /> and MW-2;'greater than 5'feet-above the"tops of the•screenedInt'eivals of wellsMW73R,-MW-4
<br /> ', 5 and almo
<br /> -6.and MW-7
<br /> e thb,iops of the screen ' intervals f wells MW
<br /> -3 feet,abo� ' ed"
<br /> Therefbre,;samples colle&edfromtfiege w"ells may not be representative of gr6und water conditions
<br /> at or.near the'top..of the-saturated soil*'zo hydrocarbon-impactne or capillary zone,where the greatest
<br /> io'groundwater'is often efico.ounteted.
<br /> 32. PETROLEUM,HYDROC.,k"ON-IMPACTED GROUND WATER
<br /> 4
<br /> During the December 2000 monitoring event, TPH-ss,'was detected in samples from monitoring'
<br /> . ,"iells MW-2',MW-3, MW-.6 and'MW77 ai'concentratioils,of 280 micrograms per liter "t 106'-.�;-j ,
<br /> '4g/l, 240 µg/l, and 110 4211, respectively. TPH-ss was not reported in the samples collectedfrorn'
<br /> wells MW-1, MW-4,•MW-5 during this sampling event.
<br /> Benzene was-reported in the water sa' rnple coll&t6d from monitoring well MW-6' at a concentration
<br /> '' 9F2.6-pg/l. Other BTEX compounds were-reported in the water samples collected from monitoring
<br /> wells at a concentrations ashigh as 7µ'g/1 (MW-6}:
<br /> Analytical results of ground water'samples.aire summarized in Tables 2. The laboratory report, (MAI
<br /> 4boptpry.ID'No. 56947 to 56953}quality assurance and quality control (QA/QC
<br /> L report,and chain-J,
<br /> of custody form for the December 2000 ground water monitoring event are included in Appendix-B, -
<br /> 2 .,
<br /> T
<br /> 3.3,- CHLORINATED HYDROCARBON-IMPACTED GROUND WATER ,
<br /> During"the sampling event;chlorinated'hydrocarbons were reported.in sampleg fromeach11,at the
<br /> w'e
<br /> site.'The chlorinated compound reported with.the,highest concentration in sampIs'collected
<br /> was cis'.. ,
<br /> I 2-dichloroethene(ciIs-1,2-DCE)':at 1,000'/z
<br /> g/I inwII'MW-6. Low concentrations' of cis 4,2!-DCE
<br /> were also'reported'in samples,from wells MW-3,-MW-4 and MW-5.
<br /> 1 1!
<br /> (TCE) were reported in �ample�:from'wells W
<br /> Tetra' chloroetherie (PCE) and trichloroetheneM 4; ,
<br /> -MW-5,,*MW-6,and MW-7 at concentrations as high As 490 gg/1 and,460./,zg/t, iespectively'(MW6).
<br /> Vinyl chloride was reported in samples from wells MW73,and MW-6 atconcentr'ationsof310
<br /> '. g/1:
<br /> and 220.µA, resp6ctiVely.
<br /> `, Analytical-results of cllo,r.hated,hydr6cai.bon'compbunds inf ground Water'sanoles are sunan.zed'
<br />,' ' 1h Tables 3-The laborato'ry-r' (MAI-Laboratory ID,No. 56947 to 56953) quality as's'urance and
<br /> epp�.t
<br /> d
<br /> contk'o 1:(QA/QC)r6pbrt 4n chain-o' f-.cu' stody.'form'are included in'Appendix'', ,`` ' 11 ,
<br /> Advanced'
<br /> GCGEhAr6nmental"Inc.
<br /> r
<br />
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