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<br /> GROUNDWATER ANALYTICAL RESULTS
<br /> 1999 SUBSURFACE INVESTIGATIONS "GRAB" SAMPLES
<br /> Gene Gabbard Inc.
<br /> 640 N El Dorado Street, Stockton, CA
<br /> (results in parts per billion)
<br /> Gasoline
<br /> DATE SAMPLE ID TPHg TPHd TRPH Benzene Toluene Ethyl Xylenes VOCs Oxygenate Total
<br /> benzene Additives Lead
<br /> 1119199 GASB1-26GW 2,700a,b,c,d 35,000c,djg 140,000c,d 23 096 35 39 31B,31C,72G,210J,91K <5/<25 <5 0
<br /> 170 520 95 520 110A,21B,35D, 190E,
<br /> GASB3-31GW 4,500c,e 510,000c,f,hj 16,000,000c 1801 640j 110j 570j 19F,44H,5501,680J,33 K, <171<85 96
<br /> 170L,270M,97N
<br /> 10/26199 GAB SB4 GW 26 <50 110 i,h <1,000 <05 <0 5 <0 5 <05 ND <51<25 —29-1
<br /> 78 13 13 19 1 6P 23E 2 70,2 7F,32R,
<br /> GAB SB5 GW 26 340e 820i,f <1,000 6 9 1 4 13 22 3 3G,3 9K,15M,2 5N, <51<25 39
<br /> GAB SB6 GW 29 <50 1601 <1,000 <0 5 <0 5 <0 5 <0 5 ND <5/<25 120
<br /> 10/27/99 GAB SB7 GW 24 <50 <50 <1,000 <05 9 7 <0 5 <05 ND <51<25 550
<br /> GAB SB8 GW 26 <50 <50 <1,000 <0 5 080 <0 5 <0 5 ND <51<25 330
<br /> NOTES
<br /> Benzene,toluene,ethylbenzene,xylenes analyzed by EPA 8020/8260 A – Acetone
<br /> Gasoline Oxygenate Additives analyzed by EPA 8260 B = n-Butyl benzene
<br /> TPHg = Total Petroleum Hydrocarbons as gasoline(EPA 8015m) C = sec-Butyl benzene
<br /> TPHd = Total Petroleum Hydrocarbons as diesel(EPA 8015m) D = tert-Butyl benzene
<br /> TRPH = Total Recoverable Petroleum Hydrocarbons(EPA418 115520) E = 1,2-Dichlorobenzene
<br /> VOCs = Volatile Organic Constituents(EPA 8260) F = 1,4-Dichlorobenzene
<br /> < W Not detected at reported detection limit G – Isopropylbenzene
<br /> ND = Not detected(detection limit vanes,see laboratory report) H – Methyl butyl ketone
<br /> a = Heavier gasoline range compounds are significant(aged gasoline?) I = Methyl isobutyl ketone
<br /> b = No recognizable pattern 3 = Naphthalene
<br /> c = Lighter than water immiscible sheen is present K = n-Propyl benzene
<br /> d = Liquid sample that contains greater than–5 vol %sediment L = 1,2,3-Tnchloropropane
<br /> e – Unmodified or weakly modified gasoline is significant M = 1,2,4-Tnmethylbenzene
<br /> t = Gasoline range compounds are significant N = 1,3,5-Tnmethylbenzene
<br /> g = Unmodified or weakly modified diesel is significant P – ChIorobenzene
<br /> h = Oil range compounds are significant Q = 1,3-Dichlorobenzene
<br /> i – Diesel range compounds are significant,no recognizable pattern R = cis-1,2-Dichloroethene
<br /> j – Result from EPA Method 8260
<br /> k = Approximate concentration,interferance from gasoline and heavy
<br /> hydrocarbon range constituents I
<br /> I = Surrogate diluted out of range
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