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September 30, 1983 MR. DAVID OLMSTEAD Post Office Box 134 Tracy, California 95376 RE: Santos Ranch, Unit #5/Water Supply Our File No. 77270-08667 Dear Dave: Pursuant to your request, we have investigated the public health standards relating to the levels of total dissolved solids that are permitted in domestic water supplies. The standards have been set by the State Depart- ment of Health Services and are explained below. Pursuant to Sections 4010-4037 of the Health and Safety Code, the California Department of Health Services has adopted primary and secondary drinking water standards that are to be met by each person who owns or operates a public water system. The standards are set forth in Title 22, Chapter 15 of the California Administrative Code. "Maximum contamination level" means the maximum permissible level of a contaminant in water which is delivered to a free-flowing cold water outlet of the ultimate user of a public water system, except in the case of turbidity where the maximum permissible level is measured at the point of entry to the distribution system. Title 22, Section 64473 provides that the maximum contaminant levels for total dissolved solids (TDS) are as follows: Mineralization -- Secondary Drinking Water Standards Maximum Contaminant Levels Recommended Upper Short Term Constituent, Units Total Dissolved Solids, mg/l 500 1,000 1,500 or �EGEIVcI� OCi 4 900 Neumiller & Beardslee 2,200 1963 mg/l A PROFESSIONAL CORPORATION 500 600 Sulfate, FOUNDED AS ATTORNEYS AND COUNSELORS 250 MAILING ADDRESS: RO. DRAWER 20 600 ASHLEY z NEUMILLER STOCKTON, CALIFORNIA 9 5 201-9 976 JANUARY 1903 FIFTH FLOOR WATERFRONT OFFICE TOWER II TELERMONE Izo 91 9Aa-ezcc THOMAS J. SHEPHARD, SR. 509 WEST WEBER AVENUE STOCKTON. CALIFORNIA 95202 September 30, 1983 MR. DAVID OLMSTEAD Post Office Box 134 Tracy, California 95376 RE: Santos Ranch, Unit #5/Water Supply Our File No. 77270-08667 Dear Dave: Pursuant to your request, we have investigated the public health standards relating to the levels of total dissolved solids that are permitted in domestic water supplies. The standards have been set by the State Depart- ment of Health Services and are explained below. Pursuant to Sections 4010-4037 of the Health and Safety Code, the California Department of Health Services has adopted primary and secondary drinking water standards that are to be met by each person who owns or operates a public water system. The standards are set forth in Title 22, Chapter 15 of the California Administrative Code. "Maximum contamination level" means the maximum permissible level of a contaminant in water which is delivered to a free-flowing cold water outlet of the ultimate user of a public water system, except in the case of turbidity where the maximum permissible level is measured at the point of entry to the distribution system. Title 22, Section 64473 provides that the maximum contaminant levels for total dissolved solids (TDS) are as follows: Mineralization -- Secondary Drinking Water Standards Maximum Contaminant Levels Recommended Upper Short Term Constituent, Units Total Dissolved Solids, mg/l 500 1,000 1,500 or Specific Conductance, micromhos 900 1,600 2,200 Chloride, mg/l 250 500 600 Sulfate, mg/l 250 500 600