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�J J • • <br /> 2101 Webster Street <br /> 12th Floor 199� <br /> Oakland, CA 94612 <br /> (510) 663-4100 • FAX (510) 663-4141 OI=OMATRIX <br /> February 4, 2002 <br /> Project 6306.001 <br /> Ms. Catherine Quinn <br /> Kinder Morgan Energy Partners, L.P. <br /> 1100 Town& Country Road <br /> Orange, California 92868 <br /> Subject: NPDES Exceedance Prevention Report <br /> Permit Number CA0084701, Order Number 5-00-217 <br /> Holt Remediation Project <br /> Holt, California <br /> Dear Ms. Quinn: <br /> The Holt groundwater extraction and treatment plant (the treatment system) in San Joaquin <br /> County, California, is operated under National Pollution Discharge Elimination System <br /> (NPDES) permit CA0084701, Order 5-00-217 (the permit). The permit was adopted by the <br /> RWQCB on October 27, 2000. This exceedance prevention report follows the January 9, <br /> 2002 notification to the Regional Water Quality Control Board, Central Valley Region <br /> (RWQCB) that the tertiary butyl alcohol (TBA)concentration for the effluent sample collected <br /> on January 7, 2002 was above the limits specified by the permit. <br /> The treatment system is operated by SFPP, L.P., operating partnership of Kinder Morgan <br /> Energy Partners, L.P. Geomatrix Consultants, Inc. prepared this report on behalf of SFPP. <br /> Included in this report is a description of the exceedance and a strategy for preventing future <br /> exceedances. <br /> The permit limitations state that effluent concentrations of TBA shall be less than 20 micro- <br /> grams per liter(µg/1). The reported concentration for TBA in the sample collected from the <br /> effluent on January 7, 2002 was 23 µg/l. <br /> Laboratory results for the January 7, 2002 sample were received on January 9, 2002. The <br /> effluent was immediately re-sampled, the treatment system was shut down, and the RWQCB <br /> was notified of the exceedance via facsimile. The reported concentration for TBA in the <br /> sample collected from the effluent on January 9, 2002 was 20 µg/1. The treatment system's <br /> liquid-phase granular activated carbon (LGAC) was replaced on January 15, 2001 and the <br /> treatment system was restarted on January 16, 2002. TBA was not detected in the January 21, <br /> 2002 effluent sample above the reporting limit of 20 ltg/l. <br /> The cause of the January 7, 2001 TBA exceedance was likely a seasonal increase in influent <br /> concentration related to recharge from a rainfall event following a prolonged dry spell. <br /> Actions taken to prevent future exceedances include replacing the LGAC and increasing the <br /> treated water recycle rate through the system relative to influent flow rates in order to increase <br /> removal efficiency. In addition, the treatment system will be closely monitored during and <br /> Geomatrix Consultants, Inc. <br /> Engineer-; Gec!ngists and Envii arimP. to Scer�u:!rs <br />