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California Regional 'er Quality Control Board <br /> Page 2 <br /> concentrations and appears to be located nearest the vapor recovery line. <br /> Concentration data and water elevations for MW-2 is graphed below. <br /> MW-2 TPHg, MTBE&Water Elevation <br /> 90000 Tosco transfers <br /> 0 terminal to ST <br /> 80000 -1 Services. Operation <br /> recovery <br /> 70000 osco acquires -2Oor <br /> scontinued. <br /> 60000 - terminal from BP -3 <br /> 50000 -4 <br /> 40000 -5 u) <br /> 30000 -6 • Water�evation <br /> 20000 <br /> -7 <br /> -8 — <br /> 10000 e 9 <br /> 0 -10 <br /> 00r- 00 M Cl) rn rn rn rn rn rn rn o <br /> rn rn m _rn rn rn rn rn M rn M o <br /> f\ �z <br /> \zz z N <br /> 01 (D N <br /> Concentration data for well MW-8 is depicted below. <br /> MW-8 TPHg, MTBE&Water Elevation <br /> 90000 <br /> 0 Tosco transfers <br /> 80000 terminal to ST <br /> 2 Services. <br /> 70000 Operation of vapor <br /> 60000 osco acquires recovery line <br /> -4 discontinued. <br /> 50000 erminal from BP <br /> e--- TPHg <br /> 40000 -6 i o MTBE <br /> 30000 • Water Elevation <br /> -8 --! <br /> 20000 <br /> 10000 -10 <br /> 0 s 12 <br /> m rn rn rn rn rn m rn m rn rn rn rn <br /> _rn rn rn rn rn m rn rn rn _rn rn rn m <br /> M N M N M CV W _O O O M <br /> m <br /> M LO n N (O <br /> It is noteworthy that the highest MTBE concentrations we tected in the <br /> immediate proximity of the vapor recovery line (MW-2) were .Wathe <br /> st prior to <br /> the time that operation of the vapor recovery line was discontinued terminal <br /> was transferred to ST Services. Concentrations of MTBE in well MW-8 (located <br /> approximately 100 feet west of MW-2) after the vapor line was no longer operational. <br /> MTBE concentrations detected in well MW-8 samples are typically lower than MW-2 <br /> samples. Taken together, this information is consistent with a release originating <br />