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CAMBRIA February 25, 2003 (TPII and pH) are presented in Appendix A Monthly Flow Data Between January 24, 2002 and February 25, 2003, the total dischargc was 77,410 gallons, which corresponds to an average flow rate of 1 68 gallons per minute Discussion As per my July 26, 2003 telephone conversation with Richard Stiffler, it is Cambria's understanding that a water conservation and hazardous waste minimization plan is not required for the subject site I was advised not to develop a spill prevention plan unless directed to by the city of Stockton based on their inspection of the system, which was slated for August or September of 2002 Cambria will gladly provide a spill prevention plan at the request of the city of Stockton,but this has not yet been submitted, in accordance with terms outlined above The discharge flow totalizing meter was calibrated by Cooper Controls and Electrical Services of Acampo, CA, on February 10, 2003, and was found to have an error rating of 12 29 percent As recommended by Cooper Controls, the meter was replaced on February 25, 2003 Documentation for the February 10, 2003 calibration and the factory certification for the new flow totalizing meter,which was calibrated on October 3, 2002, are included as Appendix B Since this meter was not in use until . February 2003, the next calibration event will be scheduled for August 2003 The LEL meter was scheduled to be calibrated by Cooper Controls on February 10, 2003 and then rescheduled for February 25, 2003 On both days Cooper Controls did not bring all of the equipment necessary to perform the calibration As per my February 26, 2003 telephone conversation with Richard Stiffler, we have rescheduled this calibration with Cooper Controls for March 25, 2003,but would like to propose a modified LEL meter calibration schedule Item 6 in section 7-089 20 of the discharge permit states "The discharger shall insure that all pretreatment facilities including, but not limited to, flow measuring and LEL monitors, are maintained in proper working order at all times All measunng devices are to be calibrated for accuracy at a frequency as prescribed by the manufacturer of the monitoring device by a qualified technician approved by the Director " The calibration policy of the manufacturer of our LEL meter, BW Technologies, is presented in Appendix C They recommend calibration and testing in the field every three months,by a competent technician Based on this policy,Cambria proposes quarterly calibration by our own field technicians Cambria will keep a log of all calibration events In addition, Cambria recommends that the LEL meter be sent to Equipco in Concord, CA on an annual basis for calibration and servicing Equipco technicians are authorized by BW Technologies to service their LEL meters 0783 2