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<br />CORE LABORATORIES
<br />D U A L I T Y A S S U R A N C E M E T HOD S
<br />REFERENCE S A N D N O T E S
<br />Report Date: 11/25/98
<br /> PATER LiMiTS SOIL LIMITS
<br /> Recovery RPD Recovery RPD
<br />VOLATILE ORGANICS
<br />Methods 602/8020 Surrogate
<br />Bromofluorobenzene 89-110X 78-123X
<br />Methods 602/8020 Spike/Spike Duplicate
<br />Benzene 39-150X 25 75-125X 25
<br />Ethyl benzene 32-160X 25 60-140X 25
<br />Toluene 46-148X 25 70-130X 25
<br />Xylenes 75-125X 25 61-139X 25
<br />Method 8015 Mod. Spike/Spike Duplicate
<br />TVPH 75-125X 20 48-152X 20
<br />TEPH 54-135% 20 54-135X ZO
<br />Methods 624/8240/8260 Surrogates
<br />Dibromof Luoromethane 86-118X 80-120X
<br />Toluene-(d8) 88-110X 81-117X
<br />4-Bromof luorobenzene 86-115Y. 74-121X
<br />Method 524.2 Surrogates
<br />4-8romofluorobenxene 80-120X
<br />1,4-Dichlorobenzene-d4 80-120X
<br />Nethods 624/8240 Spike/Spike Duplicate
<br />1,1-D ichloroethene bt-145X 14 59-172X 22
<br />Trichloroethene 71-120X 14 bt-137X 24
<br />Benzene 76-127X 11 66-142X 21
<br />Toluene 76-125X 13 59-139X 21
<br />Chlorobenzene 75-130X 13 60-133X 21
<br />Method 8260 Spike/Spike Dupli cate
<br />1,1-D ichloroethene 70-130X 14 70-130X 22
<br />Trichloroethene 71-120X 14 70-130X 24
<br />Benzene 76-127X 11 70-130X 21
<br />Toluene 76-125X 13 70-130X 21
<br />Chlorobenzene 75-130X 13 70-130X 21
<br />Method 524.2 Spike/Spike Dupl icate
<br />1,1-D ichloroethene 80-120X 14
<br />Trichloroethene 80-120X 14
<br />Benzene 80-120X 11
<br />Toluene 80-120X 13
<br />Chlorobenzene 80-120X 13
<br />PESTICIDES AND PCB's
<br />Methods 608/8080 Surrogates
<br />Tetrachloro-m-xyl ene 60-i50X 60-150X
<br />4,4'-Dichlorobi phenyl 60-150X 60-150X
<br />Decachlorobi phenyl 60-i50X 60-150X
<br />Method 8140 Surrogates
<br />T ri butyLphosphate 36-152X 36-152X
<br />Tri phenylphosphate 36-152X 36-152X
<br />Page 1
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