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TABLE B <br />. SUMMARY OF GROUNDWATER ANALYTICAL RESULTS <br /> FORMER ECONO GAS STATION <br /> 4325 EAST WASHINGTON STREET <br /> STOCKTON,CALIFORNIA <br /> ETHYL- <br /> WELL DATE BENZENE BENZENE TOLUENEXYLENES TPH9 MTBE COMMENTS <br /> M SAMPLED u l u II u 1 u l (Ug/1). u 11 <br /> MW-27 10/03/91 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 01/28/92 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 05/21/92 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 08/24/92 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 12/16/92 052 ND(0 50) ND(O 50) ND(1 5) ND(50) NA <br /> 01/29/93 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 05/26/93 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 08/19/93 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 06/07/94 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 05/04/95 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 02/23/96 NS NS NS NS NS NS Sampled Annually <br /> 06/06/96 ND(O 30) ND(O 30) ND(0 30) ND(0 60) ND(50) 11 <br /> 08/29/96 NS NS NS NS NS NS Sampled Annually <br /> 10/30/96 NS NS NS NS NS NS Sampled Annually <br /> MW-28 10/03/91 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 01/28/92 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 05/21/92 ND(0 50) NO(0 50) ND(O 50) ND(1 5) ND(50) NA <br /> 08/24/92 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 12/16/92 ND(O 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 01/29/93 ND(O 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 05/26/93 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 08/19/93 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 06/07/94 ND(0 50) ND(0 50) ND(O 50) ND(1 5) ND(50) NA <br /> 05/04/95 ND(0 50) ND(0 50) ND(O 50) ND(1 5) ND(50) NA <br /> 02/23/96 NS NS NS NS NS NS Sampled Annually <br /> 06/06/96 ND(O 30) ND(0 30) ND(0 30) ND(0 60) ND(50) N❑(i 0) <br /> 08/29/96 NS NS NS NS NS NS Sampled Annually <br /> 10/30/96 NS NS NS NS NS NS Sampled Annually <br /> MW-29 10/04/91 053 ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 01/28/92 066 ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 05/21/92 ND(0 50) ND(0 50) ND(O 50) ND(1 5) ND(50) NA <br /> 08/24/92 056 ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 12/16/92 ND(0 50) ND(0 50) ND(O 50) ND(1 5) ND(50) NA <br /> 01/29/93 ND(O 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 05/26/93 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 08/19/93 ND(0 50) ND(O 50) ND(0 50) ND(1 5) ND(50) NA <br /> 06/07/94 ND(0 50) ND(O 50) ND(0 50) ND(i 5) ND(50) NA <br /> 05/04/95 ND(0 50) ND(0 50) ND(0 50) ND(1 5) ND(50) NA <br /> 02/23/96 NS NS NS NS NS NS Sampled Biannually <br /> 06/06/96 ND(O 30) ND(0 30) ND(0 30) ND(O 60) ND(50) 30 <br /> 08/29/96 ND(0 30) ND(O 30) ND(0 30) ND(O 60) ND(50) 30 <br /> 10/30/96 NS NS NS NS NS NS Sampled Biannually <br /> MW-30 10/04/91 38 ND(0 88) 15 ND(2 5) 340 NA Slight Sheen <br /> 01/28/92 25 ND(1 2) ND(1 0) ND(3 2) 710 NA <br /> 05/21/92 98 ND(0 50) 10 ND(1 5) 220 NA <br /> 08/24/92 12 ND(1 0) 17 ND(2 7) 320 NA <br /> 12/16/92 47 ND(O 50) ND(0 50) ND(1 5) 170 NA <br /> 01/29/93 27 ND(O 50) ND(0 50) ND(1 5) 67 NA <br /> 05/26/93 ND(O 50) ND(O 50) ND(0 50) ND(1 5) ND(50) NA <br /> 08/19/93 ND(0 50) ND(O 50) ND(0 50) ND(1 5) ND(50) NA <br /> 06/07/94 ND(0 50) ND(O 50) ND(0 50) ND(1 5) ND(50) NA <br /> 05/04/95 ND(0 50) ND(O 50) ND(0 50) ND(1 5) ND(50) NA <br /> 02/23/96 ND(0 30) ND(O 30) ND(O 30) ND(0 60) ND(100) NA <br /> 06/06/96 ND(0 30) ND(O 30) ND(0 30) ND(0 60) ND(50) 47 <br /> 08/29/96 NS NS NS NS NS NS Sampled Annually <br /> 10/30/96 ND(O 60) ND(O 60) ND(0 60) ND(1 2) ND(100) 11 <br /> NmES 1)TPHg=Total Petroleum Hydrocarbons as gasolene <br /> 2)MTBE a Methyf Tert-Butyl Ether <br /> 3)ug/l micrograms per liter(parts per billion) <br /> 4)NS=Not Sampled,Sampied Annually(MW29 and CAIN-30 are sampled quarterly,alternating from onewefl to the other) <br /> 5)NO=Concentrations reported as NO were not detected at or above the reporung I"(shown tM1 parentheses) <br /> 6 NA r Not AnallyZed or not available <br /> B-1 <br />