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Ta� Historical Groundwater Monitoring and Analytical Data 7 Eleven Store#14117 2725 Country Club Boulevard Stockton CA Wa1jjD1 s r> ]-r w f4AtB1: 1,2- Meth;, -J th- Ace- Dlssol�r 1 w w Elevabon �a a of e'� tti ria y �T g 8020 MtBE TBA DIPE ELBE TAME DCA wEDB anoi anol Eons Notes xyg SPT-, TOC " 71. !L l� L L L L IL L L iL L !L 1L r'11 L fit feet #eet MW-7 1 19 11/05/01 <0 5 <0 5 <0 5 <0 5 <50 — <5 <20 <5 <5 <5 <5 <5 _ -- — 10 1020 000 -9 01 153 01/08/02 — — — — -- — — — — — — — — _ _ __ 09 — 000 -- 04/12/02 <0 5 <05 <0 5 <0 5 <50 <5 24 <5 <05 <0 5 <05 — — - — — 10 747 000 -594 07/09/02 <05 <0 5 <0 5 <05 <50 <5 24 <5 <05 <0 5 <0 5 — — — -- — 1 1 790 000 -637 10/16102 <05 <0 5 <0 5 <05 <50 <5 052 15 <0 5 <0 5 <0 5 -- — — -- — 10 943 000 -790 03/17/03 <0 50 <0 50 <0 50 <0 50 110 — 86 <5 0 <0 50 <0 50 <0 50 -- -- — — -- 12 767 000 -614 05/29/03 <0 50 <0 50 <0 50 <0 50 <50 — 42 <5 0 <0 50 <0 50 <0 50 -- — — -- -- 14 794 000 -641 098 09/18/03 <0 50 <0 50 <0 50 <0 50 160 — 36 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <5 0 23 954 000 -856 12/02/03 <0 50 <0 50 <0 50 <0 50 <50 — 17 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 -- 01 909 000 -811 03103!04 <0 50 <0 50 <0 50 <0 50 <50 — 054 <50 <0 50 <0 50 <0 50 <0 50 <0 50 — — -- d 02 668 000 -670 06109104 — -- — — — -- — — — — — — — — — — — — — -- 09/16104 <0 50 <0 50 <0 50 <0 50 <50 — 11 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — - 32 981 000 -883 12/21/04 <0 50 <0 50 <0 50 <0 50 <50 — <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — -- — 08 938 000 -840 MW-8 190 09/18/03 25 130 64 340 3,200 — 22 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 <8 0 C 08 1061 000 -871 12/02/03 22 43 47 13 320 — 079 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — 00 985 000 -795 03103/04 56 140 59 360 2,500 — 67 140 <0 50 <0 50 <0 50 <0 50 <0 50 -- — — d 03 747 000 -557 06/09/04 85 200 63 370 3,500 — 110 130 <0 50 <0 50 <0 50 <0 50 <0 50 — -- — 02 899 000 -709 09/16/04 32 60 12 68 670 — 61 65 <0 50 <0 50 <0 50 <0 50 <0 50 — — — 18 1052 000 -862 12/21/04 <0 50 <0 50 <0 50 <0 50 <50 — <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — -- 10 1015 000 -825 Explanation TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert,amyl-methyl ether TOC=Top of casing elevehon In feet above mean sea level MtBE=Methyl-tert butyl ether 12 DCA=1 2dichtaroethane pg/L=micrograms per Mer TOA=Ted Butanol EDB=1 2dibromoethane mgrL=milligrams per liter DIPE=Diisopropyl ether DTW=Depth to water —=Not sampled/not measured ELBE=Ethyl-tert butyl ether SPT=Separate-phase hydrocarbon thickness WTE=Water table elevation Notes Historical data prior to 03/17/03 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 802018015 Modrfied Samples analyzed using EPA Method 82608 starting with 03/17/03 sample date a=Method Blank Contaminabon The associated method blank contains the target anatyte at a reportable level b=Matnx Spike/Matnx Spike Duplicate for the analytes Benzene MtBE was affected by the anayte concentrations already present in the un-spiked sample c=The Method Reporting Limit for Acetone has been increased due to the presence of an interfering compound d=Matnx Spike/Matrix Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already present m the un-spiced sample e=Hydrocarbons reported as TPHg do not exhibit a typical Gasoline chromatographic pattern f=Matrix SpikelMatrix Spike Duplicate Results for the analyte Benzene were affected by the analyte concentrations already present in the un-spiked sample 117 Elevenl7 11 StoreMl411 ATables114117 Current Groundwater-xMistoneal Water Page 6 Of 6