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San Joaquim County Public Health Services <br />January 12, 1998 <br />Page 3 <br />BP requested copies of tank and meter reconciliation data and tightness test results to <br />further evaluate the MTBE concentration increases noted between 4 October 1995 and 4 <br />January 1996. Tosco's response is attached. Tosco's inventory reconciliation forms <br />show that an internal and external criteria are used to evaluate inventory reconciliation <br />data. When the monthly variance is greater than 0.5, the territory manager completes a <br />Follow Up Checklist (the internal criteria). When the monthly variance exceeds the <br />Federal Regulatory limit of 1% of throughput plus 130 gallons, the territory manager is <br />to be immediately notified (the external criteria). Below find a summary table of the <br />inventory reconciliation variance data for each product grade sold at the site for the time <br />period requested by BP. <br />Inventory Reconciliation Data <br />Former BP Oil Site No. 11194 <br />2375 North Tracy Boulevard <br />Date Regular Unleaded Super Premium <br />1/96 <br />2.43 <br />1.44 <br />1.65 <br />2/96 <br />0.61 <br />0.32 <br />0.48 <br />3/96 <br />0.25 <br />4.74 <br />0.39 <br />4/96 <br />0.59 <br />0.45 <br />0.33 <br />5/96 <br />1.15 <br />1.72 <br />1.48 <br />6/96 <br />1.84 <br />1.56 <br />2.60 <br />7/96 <br />1.46 <br />2.35 <br />.0.069 <br />8/96 <br />1.79 <br />0.16 <br />3.15 <br />9/96 <br />1.16 <br />1.65 <br />0.73 <br />10/96 <br />0.78 <br />1.00 <br />0.13 <br />11/96 <br />0.38 <br />0.024 <br />0.109 <br />12/96 <br />0.028 <br />0.048 <br />0.32 <br />1/97 <br />0.11 <br />1.37 <br />0.04 <br />2/97 <br />0.65 <br />0.61 <br />0.02 <br />Notes: <br />1. USTs exceeding Federal Monthly Variance Criteria (1% of throughput plus 130 <br />gallons) are underlined. <br />2. USTs exceeding Tosco variance criteria of 0.5 are shown in italics <br />Tosco's inventory reconciliation data shows that the regular and super underground <br />storage tank systems usually exceed the internal reporting criteria of 0.5. Form <br />instructions state that a Follow Up Checklist should be completed to investigate the <br />situation, however -- with one exception -- it does not appear that this ever took place <br />based on the information Tosco provided. That exception is a follow-up checklist dated <br />