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<br /> AGE-NC.Pro',ect No. 98=0440
<br /> Page 8 of•9' ;
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<br /> Utilizing EPA method 8260, none of the fuel.oxygenates were detected above laboratory,reporting
<br /> limits. The analytical results of selected soil"swnles are summarized in Table L The laboratory a"
<br /> re oqs McCam bell Analytical Inc. Lab I.
<br /> ' - � D. No. 91924, through 91956) and chain-of-custody
<br />' forms are included in Appendix C. '
<br />' 4.5.; ANALYTICAL RESULTS OF GROUND WATER SAMPLES'-
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<br /> •A total of four,,ground water samples were submitted to DTSC-certified laboratories for analysis '
<br /> TPH-g .was .detected in. ground water..samples -collected', from We11s MW-2-and- MW 3 ''at
<br /> concentrations of 2,400 ,and .150. parts, ,per billion (ppb,, reported` as, micrograms per lltei), ,
<br /> respectively; TPH=d was detected. in-the sample'collected from wells MW-1 through MW-3` at
<br />' concentrations up to 1,600 ppb (MW-2). 21.
<br /> Utilizing EPA Method 8020, BTEX were not detected.in ground;water'samples collected from wells
<br />' MW-I, MW-3 and'MW-4;however,toluene, ethylbenzene and`xylenes were detected in a sample ;
<br /> collected•from MW-2 at concentrations as high as-36 ppb'.
<br />' Utilizing EPA Method 8260;none of the fuel oxygenates were detected above laboratory reporting
<br /> 'limits. The analytical results of quarterly ground water samples are summarized-in Table 3. The '.
<br />' laboratory reports (McCampbell Analytical Inc. Lab I.D. No. 92234 through 92237)and chain-.of-.,
<br /> custody farms are included in:Appendix C.
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<br /> 5A. SUMMARY-AND CONCLUSIONS ;
<br /> Based upa'n;data collected during the July 19918 drilling activities'and the July'1998 ground water
<br /> monitoring; AGE'concludes: ,
<br />' •• Ground water wasinferred to be flowing'generally north at a,calculated.gradient 6f:0.0I
<br /> ft/.ft, or approximately 69,feet per mile,(Figure''9)..Due.to the lo W` at'the site, slight
<br /> , variations in.ground:water.measurements or:changes of,recharge%discharge of the local
<br /> 1 .'ground water could greatly`modify-ground water flow direction:The low gradient implies
<br /> that ground water is.moving quxie,slowly.:
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<br /> • TPH d was detected at'concentrations ranging between 200 ppb'and 1;600.ppb from ground
<br /> water monitoring wells MW-1 ihrough MW-3;'TPH-g was detected,from wells MW-2-6n&
<br /> MW=3 at concentrations of-2,400 ppb:and 150 ppb, respectively:
<br /> • Laboratory analysis,of groundwater samples'indicates that the greatest'concentrations of
<br /> dissolved,petroleum'hydrocarbons'is,located near well MW-2:
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