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INFORMATION SHEET,ORDER NO. 5-01-251 4- CITY-OF LATHROP AND CROSSROADS CREA LLC WASTEWATER TREATMENT FACILITY NO. 1 (CROSSROADS) SAN JOAQUIN COUNTY Constituent Units Value Beneficial Use Criteria or Justification Sodium mg/L 69 AGR' Sodium sensitivity on certain crops Total Dissolved Solids mg/L 450' AGR' Salt sensitivity° Total Coliform Organisms MPN/100 ml 2.2 MUN' Basin Plan 500 MUN' Recommended Secondary MCL' 1,000 MUN 1 Recommended Upper MCL s Chloroform 1 g/L 1.1 MUN 1 Narrative Toxicity Criteria1 ' Bromodichloromethane µg/L 0.27 MUN 1 Narrative Toxicity Criteria° Dibromodichloromethane µg/L 0.37 MUN 1 Narrative Toxicity Criteria10 Bromoform pg/L 4.3 MUN 1 Narrative Toxicity Criteria10 Total Trihalomethanes µg/L 80 MUN I MCL' pH pH Units 6.5 to MUN 1 Secondary MCL 9 8.5 1 Municipal and domestic supply 2 Council of the European Union,On the Quality of Water Intended for Human Consumption,Council Directive 98/83/EC(3 November 1998). 3 Agricultural supply 4 Ayers,R.S.and D.W.Westcot,Water Quality for Agriculture,Food and Agriculture Organization of the United Nations—Irrigation and Drainage Paper No.29,Rev. 1,Rome(1985) 5 Title 22,California Code of Regulations(CCR),section 64449,Table 64449-B 6 Title 22,CCR,section 64449,Table 64449-A 7 Title 22,CCR section 64431,Table 64431-A 8 United States Environmental Protection Agency 9 Title 22,CCR,section 64439 10 California Environmental Protection Agency,Office of Environmental Health Hazard Assessment Cancer Potency Factor as a Drinking Water Level, California Environmental Protection Agency Toxicity Criteria Database. Municipal wastewater contains numerous dissolved inorganic waste constituents (i.e., salts,minerals) that together comprise total dissolved solids (TDS). Each component constituent is not individually critical to any beneficial use. Critical constituents are individually listed..The cumulative impact from these other constituents, along with the cumulative affect of the constituents that are individually listed can be effectively controlled using TDS as a generic indicator parameter. Not all TDS constituents pass through the treatment process and soil profile in the same manner or rate. Chloride tends to pass through both rapidly to groundwater, As chloride concentrations in most groundwaters in the region are much lower than in treated municipal wastewater, chloride is a useful indicator parameter for evaluating the extent to which effluent reaches groundwater. Boron is another TDS constituent that may occur in wastewater in concentrations greater than groundwater depending on the source water, to the extent residents use cleaning products containing boron, and whether any industrial dischargers utilize boron(e.g., glass production, cosmetics). Other indicator constituents for monitoring for groundwater degradation due to recharged effluent include total coliform bacteria, ammonia,total nitrogen, and Total Trihalomethanes (TTHMs), a by-product of chlorination. Dissolved iron and manganese are useful indicators to determine whether components of the W WTF with high-strength waste constituents, such as sludge handling facilities, are ineffective in containing waste. Exceptionally high TDS and nitrogen also typifies this type of release.