SITE INFORMATION AND CORRESPONDENCE_1998-2000

Home Browse Search

A • INFORMATION SHEET -2- CITY OF STOCKTON AUSTIN ROAD LANDFILL GROUNDWATER TREATMENT SYSTEM SAN JOAQUIN COUNTY false positive analytical results in analyses near the limits of detection. The daily maximum limits for total VOCs and total BTEX compounds have been set at 1 in any single sample. For TPH,the daily maximum has been set at the taste and odor threshold of approximately 0.1 mg/1. The daily maximum for lead is set at 50 µg/1,the MCL for that constituent. Dilution available in the storm drain and receiving water is expected to provide adequate dilution to prevent any exceedance of a receiving water standard for volatile organic constituents and other compounds. Other constituents reported to be present in the untreated groundwater at trace concentrations, below Maximum Contaminant Levels or National Toxic Rule standards, are not considered to be significant in comparison with those constituents listed above. The proposed wastewater treatment technology to be used for compliance with the effluent limitations for the significant sources of VOCs in this permit is expected to also result in non-detectable concentrations for the trace concentrations of VOCs. Three species chronic toxicity testing on a sample of 100% effluent is required annually to screen for any toxicity. The monitoring is required as specified in EPA 600/4-91-002. If the screening shows any toxicity,the Discharger is required to retest,using a dilution series specified in the monitoring and reporting program. If the testing indicates that the discharge causes,has the reasonable potential to cause, or contribute to an in-stream excursion above the water quality objective for toxicity,the Discharger is required to submit a workplan to conduct a Toxicity Reduction Evaluation(TRE) and, upon approval, conduct the TRE. This Order may be reopened and a chronic toxicity limitation included and/or a limitation for the specific toxicant identified in the TRE included.