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Table 5 Groundwater Analytical Results Summary San Joaquin County Mosquito Vector Control District,Stockton Sample Information Results EPA Method 8020(uglL) Mod 8015(mglL) Area and Well Date Sampled Benzene Toluene Xylene Ethylbenzene 1,2-DCB 1,3-DCB 1,4-DCB Chlorobenzene I MTBE I TPHe I TPHp Tanks 1 and 2(Weed Oil) MW-1 19-Aug-94 ND(1 0) ND(1 0) NO(1 0) ND(1 0) ND(1 0) ND(1 0) ND(1 0) ND(1 0) -- ND(O 048) -- 17-Mar-95 NO(0 5) NO(0 5) NO(0 5) NO(0 5) -- — — — — ND(O 05) — 16-Jun-95 NO(0 5) NO(0 5) NO(0 5) NO(0 5) -- — -- -- — 0 076 — 15-Sep-95 NO(0 5) NO(0 5) ND(0 5) NO(0 5) — — — — -- 0 062 -- 6-Dec-95 ND(0 5) ND(0 5) NO(0 5) NO(0 5) — -- - — — 0 062 2-Apr-96 — -- I -- — -- -- I — — ND 50 — — MW-2 19-Aug-94 NO(0 5) NO(0 5) ND(0 5) NO(0 5) NO(0 5) NO(0 5) NO(0 5) NO(0 5) — ND(O 048) — 17-Mar-95 ND(0 5) NO(0 5) ND(0 5) ND(0 5) — — — — — ND(O 05) -- 16-Jun-95 NO(0 5) ND(0 5) NO(0 5) NO(0 5) -- — — — — ND(O 05) — 15-Sep-95 ND(0 5) ND(0 5) ND(0 5) ND(0 5) -- — — — — ND(O 05) -- 6-Dec-95 NO 0 5 NO 0 5 NO 0 5 NO 0 5 - - - -- - 0 052 -- MW-3 19-Aug-94 NO(0 5) NO(0 5) NO(0 5) NO(0 5) NO(0 5) NO(0 5) NO(0 5) NO(0 5) - ND(O 048) -- 17-Mar-95 ND(0 5) NO(0 5) NO(0 5) NO(0 5) -- -- - - - ND(O 05) - 16-Jun-95 ND(0 5) NO(0 5) NO(0 5) ND(0 5) -- -- — -- — 069 -- 15-Sep-95 12 NO(0 5) NO(0 5) NO(0 5) — — -- -- -- 0 061 — 6-pec-95 NDCO 5)___ NO 0 5 NO 0 5 NO 0 5 -- -- — — — ND(O 05 — Water Supply 113-Apr-87 ND(5 0) NO(5 0) ND(5 0) -- -- -- -- _ _ ND(0 5) _ 2-Apr-96 — — — -- -- — — — ND(50) — — Hydropunch Samples Tank 3 Gasoline HP-1 27-Jul-94 NO(1 0) NO(1 0) NO(1 0) NO(1 0) — — — -- 0 88 IND 0 050 Tank 4 Aviation Fuel HP-Z 26-Jul-94 ND(1 0) 5 26 NO(1 0) -- — — — 13 1 NO(0 050) ND(O 05)=Not detected,reporting limit indicated in parentheses DCB=Dichlorobenzene --Not sampled TPHp=Total Purgable Petroleum Hydrocarbons TPHe=Total Extractable Petroleum Hydrocarbons