SITE INFORMATION AND CORRESPONDENCE_1993-2003

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INFORMATION SHEET 12 WASTE DISCHARGE REQUIRMENTS ORDER NO.R5-2002-0213 U.S. DEPARTMENT OF DEFENSE DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE GROUNDWATER REMEDIATION SYSTEM SAN JOAQUIN COUNTY a water quality based effluent limitation is not required based upon available data are identified with a `N', for no. Pollutants for which information was not sufficient, and/or for which the analysis could not be completed are identified with an `I', for incomplete. This Order requires the collection of additional effluent and background water quality data, and may be reopened if collected data indicate a water quality based effluent limitation is required for a particular pollutant. Calculation of Effluent Limitations At Section 1.4, the SIP provides four methods for developing water quality based effluent limitations necessary to control a priority pollutant. These methods include: 1. Use of a Waste Load Allocation based upon the results of a TMDL 2. Use of Steady State Model(s) 3. Use of Dynamic Model(s) 4. Established effluent limitations which consider intake water pollutants Data Quality/Discussion of RPA for Specific Pollutants Approximately1wo years of the most recent effluent monitoring data were compiled for each of the three GWTPs and these data are summarizedin Attachment C. Data for most pollutants was not of sufficient quality for comparison with adjusted water quality criteria. This Order requires the Discharger to collect additional effluent and receiving water data for pollutants of sufficient quality for comparison with appropriate criteria. This Order may be may be re-opened if the data indicate concentrations of pollutants are or may be discharged at a level which will cause or have the reasonable potential to cause or contribute to an in-stream excursion above the appropriate criteria. Total Petroleum Hydrocarbons (TPH) Previous Order No. 95-258 included daily maximum and monthly median effluent limitations for TPH (100 µg/L(ppb) and< 50µg/L(ppb),respectively) consistent with General Order 92-150, which regulated discharges of petroleum contaminated groundwater to surface waters. On 16 June 2000, General Order 92-150 was rescinded, and renewed General Order No. 5-00-119 was adopted. Renewed General Order No. 5-00-119 retained the effluent limitations for TPH of the previous Order(monthly median changed to 30-day median)based upon a combination of technology and water quality criteria. The 30-day median limitation of< 50 µg/L(ppb)was established based upon commonly available treatment and analytical technology. The daily maximum effluent limitation of 100 µg/L(ppb)was established based upon taste and odor water quality criteria. These criteria still apply to the discharge, and TPH constituents have been detected in influent groundwater,prior to treatment, at concentrations up to 340 µg/L (ppb). Therefore, the daily maximum and monthly median effluent limitations for TPH have been retained and included in this Order.