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Table t Groundwater Elevation and Analytical Data ARCO Service Station No 2093 3425 Tracy Boulevard Tracy California Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Elevation to Water Elevation Elevation 'thickness TPMg Benzene Toluene benzene (total) MtBE DO Number Sampled (11,MSL) (ft,TOC) (1t,MSL) Change(ft) {fl) fpg/L) W91L) (JIVE) Wg/L) (JgfL) WgIL) (mg/L) 7/18/1996 1285 027 3 400 200 <5 0 130 56 60 SMW 1 ll/1&1996 13 40 055 250D 180 <Z5 62 21 590 (Cont) 3/14/1997 NP 1335 005 1 700 130 <0 5 <05 <05 230 013 6/4/1997 NP 1273 062 520 36 31 1 4 15 47 005 6111!1997 11/17/1997 NP 1298 — <50 <05 <05 <05 <05 290 3/30/1998 NP 1215 - 081 910 46 <0 5 <05 11 110 is 612511998 NP 1270 055 69 2 0 666 <05 <05 <0 5 765 is 9/11/1998 NP 1290 020 <50 <0 5 <05 <05 <0 5 290 17 1215+1098 Well no longer monitored or sampled TEX 1 10/26/1995 (a) 12 a6 <350 <5 <05 <0 5 <05 2/12/1996 1090 196 - -_ 4/18/1996 1135 045 <50 <05 <0 5 <0 5 <0 5 7/18/1996 1152 - 017 11/15/1996 1230 078 - 3/14/1997 -- 6/4/1997 - - - 8/11/1997 _ 11/17/1997 3/30/1998 1100 6/2511998 100 1000 - 9/11/1998 12/15/1998 1147 01 5/14/1999 1150 - 003 48 9/16/1999 1170 020 _ 24 12/22/1999 1156 014 - - 183 2/29/2000 1098 058 40 6lT/2000 - — 9/25/2000 12/21/2000 11 88 . 3/27/200111 34 054 _ &20/200, i l 53 019 9/12/2001 1162 009 16 12/19/2001 1142 020 _ 3/4/2002 11 45 003 6/28/2002 1167 022 9/11/2002 1164 003 12/17/2002 1096 068 3131/2003" 1140 044 6/9/2003 1126 014 Not Sampled W18121103 11 64 039 <50 <05 <05 :0.5 <OS <0.5• 31 TB-1 12/1912001 <50 <05 <0 5 <05 <D5 - QTCB 3/14/2002 - <50 <05 <0 5 <05 <0 5 Notes A = groundwater elevation corrected by adding 0 77 X product thickness MSL w mean sea level < = below given laboratory detection limit PMP = purged/not purged = not measured or analyzed(in case of product thickness now found) TB 1 = Trip Blank = analyzed using EPA Method 8260B TOC = top of casing DO = Dissolved oxygen TPHg = Total petroleum hydrocarbom as gasoline It = feet (reported as GRO-gasoline range organics) mg/L = milligrams per liter pg/L = micrograms par liter MBE = Mothyl tart butyl ether (a)=tap of casing altered and casing not resurveyed water level measured from highest point of casing '=Hydrocarbon pattern is present in the requested fuel quantilatlon range but riot resemble the pattern of the requested fuel Data Qualifier Definitions U The analyse was analyzed for but was not detected above the sample reporting limit J The analyle was positively identified the associated numerical value is the apprommate concentration of the analyte in the sample N The analysts indicates the presence of an analyte for which there is presumptrve evidence to make a`tentative identification" NJ The analysis indicates the presence of an analyte that has been'tentativety identified"and the associated numerical value represents Its approximate concentration UJ The analyte was riot detected above the reported sample reporting limit However the reported reporting limit is approximate and may or may not represent the actual limit of quantitabon necessary to accurately and precisely measure the analyte in the sample R The sample results are refected due to serious deficiencies In the ability to analyze the sample (I a the presence or absence of the analyte cannot be verified)or the analyte identiflcatlon has been rejected(I a the presence of the analyte cannot be verified) ND Not detected above reported detection limit KAWp—e L15BP ARCU02093V0,mmlyk3 u1R 0312097 OWMR8003 Page 11 of 11