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CALIFORNIA MONTHLY STATISTICAL INVENTORY RECONCILATION (SIR) REPORT Unocal No. 4409 Address 1502 N. EI Dorado City Stockton Phone (714) 572-7653 Zip 95204 NOTE: N/A indicates No Analysis Performed Negative Calculated Leak Rates indicate a Gain 1. The tank owner is required to have an SIR report for each month [Section 2643 (b)(3) CCR']. 2. Monthly reports must be submitted to the local agency upon request [Section 2712 (b) CCR]. 3. The tank owner is required to have the report by the 20th day of the following month [Section 2646.1 (c) CCRJ. 4. If for any reason, the test is neither "pass" nor "fail", the "inconclusive column must be marked. 5. The local agency must be notified of a tank that does not pass the SIR test within 24 hours of receipt of the report and the SIR report must be submitted to the local agency within 10 days of the date of the report [Section 2646.1 (d) CCR]. 6. Quantitative and Qualitative Methods: a. A leak threshold, minimum detectable leak rate, and calculated leak rate must be provided for each tank. If not, then the tank failed the SIR test. b. If the calculated leak rate for a tank is greater than or equal to the leak threshold, the tank failed the SIR test. C. If the minimum detectable leak rate for a tank is greater than the certified performance standard (i.e., 0.1 or 0.2 gph) and the calculated leak rate is less than the leak threshold, the test is inconclusive for that month. d. Two consecutive failures and/or inconclusives requires a tank and/or piping integrity test within 15 days from the date of the second report [Section 2646.1 (h) CCR]. 7. Optional. CCR means Title 23, Division 3, Chapter 16 of the California Code of Regulations SWRCB—SIR/MON-01 (12/94) Name Unocal Address 2929 E. Imperial Highway City Brea Phone (714) 572-7653 Name Unocal Phone (714) 572-7653 ETL Southwest Phone (602) 837-8738 SIRAS —version 2.8.3—PPM 3.1.1 Date of SIR report 4/13/95 3/95 What is the required number of usable inventory days per tank? 15 Last Two This Month Month (7) Months Ago (7) Leak Threshold Minimum Detectable Leak Rate (6c) Calculated Pass, Fail, Leak Rate (6b) Inconclusive Pass, Fail, Inconclusive Pass, Fail, Inconclusive gph gph gph P. F 1 P F I P F I Tank No. 87-1 Regular Unleaded 12000 0.20 0.20 0.02 - • Tank No. 89-1 Medium Grade Unic 12000 0.20 Not Submitted Tank No. 92-1 Premium Unleaded 12000 0.20 0.20 -0.08 Tank No. DSL -1 #2 Diesel Fuel 120001 0.20 0.20 1 0.10 NOTE: N/A indicates No Analysis Performed Negative Calculated Leak Rates indicate a Gain 1. The tank owner is required to have an SIR report for each month [Section 2643 (b)(3) CCR']. 2. Monthly reports must be submitted to the local agency upon request [Section 2712 (b) CCR]. 3. The tank owner is required to have the report by the 20th day of the following month [Section 2646.1 (c) CCRJ. 4. If for any reason, the test is neither "pass" nor "fail", the "inconclusive column must be marked. 5. The local agency must be notified of a tank that does not pass the SIR test within 24 hours of receipt of the report and the SIR report must be submitted to the local agency within 10 days of the date of the report [Section 2646.1 (d) CCR]. 6. Quantitative and Qualitative Methods: a. A leak threshold, minimum detectable leak rate, and calculated leak rate must be provided for each tank. If not, then the tank failed the SIR test. b. If the calculated leak rate for a tank is greater than or equal to the leak threshold, the tank failed the SIR test. C. If the minimum detectable leak rate for a tank is greater than the certified performance standard (i.e., 0.1 or 0.2 gph) and the calculated leak rate is less than the leak threshold, the test is inconclusive for that month. d. Two consecutive failures and/or inconclusives requires a tank and/or piping integrity test within 15 days from the date of the second report [Section 2646.1 (h) CCR]. 7. Optional. CCR means Title 23, Division 3, Chapter 16 of the California Code of Regulations SWRCB—SIR/MON-01 (12/94)