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TAG I
<br /> HISTORICAL GROUNDWATER MONITORING DATA ,
<br /> Former ARCO Service Station No 2168 '
<br /> 441 Charter Way
<br /> Stockton,California
<br /> Uevatlon
<br /> Top of Static Water Water Depth to Ethyl Total Dissolved
<br /> Well ID Casing(feet Level Elevation Screen. TPHG Benzene Toluene benzene Xylenes M fBE Oxygen
<br /> &Sample Date msl) (feet bgs) (feet msl) (feet bgs) µg/L [iglL pg/L lig1L µg/L n/L (ppm) Observations
<br /> MW-8 8130/00 935 1885 950 150 115 <2 <2 <2 <2 <2 NA No FP,No S,Yes 0
<br /> 11/21/00 1930 -995 <50 <0 5 <0 5 <0 5 <0 5 <2 NA No FP,No S,Yes 0
<br /> 2115/01 1883 -948 <50 <0 5 <0 5 <0 5 <0 5 <2 12 No FP,No S,O=NE
<br /> 5117101 1890 -955 <50 <0 5 <0 5 <0 5 <0 5 <2 26 No FP,No S,Yes O
<br /> 8116/01 20 12 -1077 <50 <0 5 <0 5 <0 5 <0 5 <2 09 No FP,No S,No O
<br /> 1216101 1829 -894 <50 <0 50 <0 50 <0 50 <0 50 <0 50 16 No FP,No S,Yes O
<br /> 2/14/02 1927 -992 <50 <0 SO <0 50 <0 50 <0 50 <0 50 3 1 No FP,No S,No 0
<br /> 6113/02 1973 -1038 <50 <0 50 <0 50 <0 50 <0 50 <0 50 12 No FP,No S,Yes 0
<br /> MW-8B 8130100 961 2027 -1066 750 1,130 425 496 106 108 <2 NA No FP,No S,Yes 0
<br /> 11/21/00 2098 -1127 924[4] 241 234 525 109 <2 NA No rP,No S,Yes 0
<br /> 2115/01 2088 l 1 27 811 [7] 159 298 490 492 <2 1 3 No FP,No S.O=NE
<br /> 5117101 2024 -1063 137[5] 504 1 32 947 43 <2 25 No FP,No S,Yes 0
<br /> 8/16/01 2164 -1203 63 12 079 76 42 <2 18 No FP,No S,Yes 0
<br /> 12/6101 2258 -1297 94[81 40 <0 50 5 5 17 <0 50 1 1 No FP,No S,Yes O
<br /> 2!14/02 2106 -1145 <50 49 <0 50 <0 50 <0 50 1 1 16 No FP,No S,Yes 0
<br /> 6113102 2134 1173 <50 12[11] <050 131111 15[11] <050 33 No FP,No S,Yes 0
<br /> MW 8C 8/30/00 901 2[21 -1220 1050 685 156 678 2 18 758 <2 NA No FP,No S,Yes 0
<br /> 11/21/00 19 19 -10 18 <50 0 692 <0 5 <0 5 <0 5 <2 NA No FP,No S,Yes 0
<br /> 2/15101 2055 -1154 <50 1 84 173 <50 194 <2 20 No FP,No S,O=NE
<br /> 05/17/01 1995 -1094 <50 0 861 <0 5 <0 5 <0 5 <2 20 No FP,No S,Yes 0
<br /> 8116/01 2141 -1240 <50 071 <0 5 <0 5 <0 5 <2 44 No FP,No S,No O
<br /> 1216/01 2228 -13 27 150 47 12 12 45 <0 50 13 No FP,No S,Yes 0
<br /> 2/14102 2064 -11 63 <500[9] 120[9] <5 0[9] 18[9] <5 0[9] 1 3 1 8 No FP,No S,Yes 0
<br /> 6/13102 21 10 -1209 <50 68 <0 50 <0 50 062 054 l 8 No FP,No S,Yes 0
<br /> NA=Not analyzed NS=Nat sampled NE=Not evaluated 0=Odor S=Sheen FP=Free product uisE=mean sea level bgs"below ground surface
<br /> pg/L—Analytical results in micrograms per liter
<br /> Sanple designations. [4]Chromatogram Pattern Gasoline C6-C 12
<br /> MW-4 34 Weli Ip and sample depth(feet) [5]Chromatogram Pattern Weathered Gasoline C6 C12
<br /> W 24 M W3R Water sample sample depth(feet) R=Pmsate blank [6]Chromatogram Pattern Weathered Gasobae C6-C12+Unidentified Hydrocarbons C6-C 12
<br /> TPHG—Total petmIc uri hydrocarbons as gasoline (7]Chromatogram Pauem Unidentified Hydrocarbons Cr-C12
<br /> <=Below detection tures for analytical methods used (9]Hydrocarbon pattern is present in the requested fuel quantization range but does not resemble
<br /> •=Raised method reporting limit due to high analyte concentration requiring sample dilution the pattern of the requested fuel
<br /> '=Raised method reporting hunt due to matrix interference [9]Sample was re analyzed outside of USEPA recommended hold time at a dilution
<br /> MTBE was analyzed using USEPA Method 8260 unless noted otherwise(see below) [101 The sample was diluted due to the presence of high Ievcls of non target analytes resulting in
<br /> [i]=MTBE was analyzed using USEPA Method 8020 elevated reporting linuts
<br /> 1[
<br /> [2]—Water levels collected on 11!5!99 samples collected on 12117/99 due to equipment failure [I l]The reported compound(s)have been confirmed by a second(drasurular)column or detector
<br /> [3]=Water level collected on 7125!00
<br /> [3]=Water level collected on 7/25100
<br /> Arco_2168_Quaixer ly_Data As
<br /> 8 org
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