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<br /> !, T '4 n'' '-, : I t J I i r , ' j I �Y. t ! l.,f J•
<br /> 20 August 2001
<br /> Pro ect No 95=61"14 ; .
<br /> AGE-NC ,j u
<br /> Pagel&"Of 9'
<br /> ples collected frons '
<br /> TPH-ss wa's'detected In two soil�samplcs near
<br /> the detection'Itmst,while three sam
<br /> `within:the forliier UST.area had a significant coiscentrarion of TPH-ss:
<br /> t concentration-of 4;800 milligrams,per
<br /> Sample N1W9-20,.MW9_30 'and MW,9-40 had'TPH-ss a . les ;
<br /> kilogr*,(mg/K�);
<br /> 960 mglkg gild 3,100 rriglkg, respectively, TPH-ss was also detected.in same
<br /> ' MW8=20 and MW8-45.at concentrations••1.4 mg/kg
<br /> and 5:8 mgfkg,'respectively,
<br /> T` X acid fueI were not"detected-in;the soil samples collected during this pYiase'of the investigation
<br /> B E MW9-anti 1VIWI0 at concentrations as high as•
<br /> ^'r VOCs'wefe deteeted in the soil sample from baring tetrachloroethene
<br /> trimethylbenzene) and 100 4kg
<br /> 1.0,000 rrlicrograrn per kilogram(µgig) (f,,2;4, ,
<br />'` richloroethene was also detected' in-the soil samples collected from'boring MW=10 at
<br /> {PCE}..T
<br /> high as 31
<br /> concentrations as g/kg ''
<br /> r pits
<br /> les are(summarized in Table 4• The laboratory ep "
<br /> i The an lytical results of selected soil same
<br /> 'Coln bell Analytical Laboratory Reference No. 65981-to 65991)and'chain-of-custody forms are .
<br />' included in Appendix E.
<br /> 4.0. . SUMMARY AND CONCLUSION ;
<br /> Based upan.the results of the investigation, AGE concluded that: L
<br /> Silt and'lay nn
<br /> c:rcd t� ucl3tls'c�?.3'� :Oct `�"d clay' were encountered to I
<br /> was encountered at 35 feet bsg and locally at 45 feet bsg. Silt an
<br /> a depth of 45,feet bsg off'site,north of Harding Way.
<br /> j. Crraund vvater.depths,within the'established monitoring wells was,apprll fe t bel ately w preeet sent, '.
<br /> Wells at the site are"drowned"with..well screen intervals as much as
<br /> 1 and water surface:The newly installed.wells were screened across:the current water table.'
<br /> ground r
<br /> • " TPH-ss'was.detecte&in the monitoring'kell samples on the site'and was not de6teMe4�d-�and
<br /> down gradient;ground water monitoring Wells'at the.e'dges and off site (MW ;
<br /> MW-10). BTEX can}pounds were slot detected inaany of the ground water samples.
<br /> r
<br /> ' ; • PCE.and TCE•were detected in the,water sarnp
<br /> les collected from welts MW6;MW7 and the ,
<br /> newly,installed well MW_10,,at concentrations which exceededaliornsa�-Department Of, ealanth
<br /> ise've1 (1VICI:)'of`5, ig/l,established by.the .State of C
<br /> �. Services.Detected concentratiorss of cis.1,2-dicliloroetherse and vinyl:chloride also exceeded
<br /> the State MCL of 6µg11..
<br /> e has not been defined east
<br /> • The lateral extent of the dissolved halogenated-hydr wTPH s and VOCs is.aepicted'in .
<br /> north ofwells MW-6 and MW-10. A'map of dissolved
<br /> r'.
<br /> Figure 4. �. � .. ' - -., . . - • . -: � -, - ;, _
<br /> Advanced GeoEovironmental,Inc;,
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