Environmental engineering. Water, wastewater, soil, and by Nelson L. Nemerow, Franklin J. Agardy, Joseph A. Salvato
By Nelson L. Nemerow, Franklin J. Agardy, Joseph A. Salvato
Water offer; Water therapy / T. David Chinn -- Wastewater therapy and disposal / John R. Kiefer
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California, for example, regulates perchlorate even though there is no federal mandate to do so. 10 give World Health Organization (WHO) water-quality guidelines. 003 Maximum Contaminant Level (MCL) (mg/1 unless noted) Kidney/liver effects/cancer risk Liver/circulatory/nervous system effects Kidney/liver effects/cancer risk Cancer risk Cancer risk/liver/kidney/gastrointestinal effects Kidney/liver/adrenal gland effects Cancer risk/nervous system effects Cancer risk/liver effects Nervous system/liver effects Liver/nervous/circulatory effects Cancer risk/liver effects Cancer risk Cancer risk/liver/reproductive effects Kidney/stomach effects Kidney/liver/nervous/circulatory effects Kidney/liver/nervous/developmental effects Nervous system effects Cancer risk/developmental/reproductive effects Cancer risk/liver/gastrointestinal effects Cancer risk/reproductive/liver/kidney effects Nervous system/liver effects Cancer risk/liver/kidney/thyroid effects Cancer risk/liver/kidney/nervous system effects Health Effects of Contaminant 21 Treatment Treatment Treatment Treatment Treatment technique technique technique technique technique (MCLG (MCLG (MCLG (MCLG = = = = 0) 0) 0) none) Less than 40 samples/month; no more than one positive for total coliforms.
12. Sampling points should reflect the quality of the water in the distribution system and be at locations of greatest use. Fecal coliforms/E. coli; Heterotrophic Bacteria (HPC) • • If any routine or repeat sample is total coliform positive, the system must also analyze that total coliform positive culture to determine if fecal coliforms or E. coli are present. If fecal coliforms or E. coli are detected, the system must notify the state before the end of the same business day, or, if detected after the close of business for the state, by the end of the next business day.
However, in no case may the state reduce the frequency to less than once a quarter. S. Environmental Protection Agency, Washington, DC, May 1990, p. 22. 11 a Number of repeat samples in the same month for each total coliform-positive routine sample. Except where state has invalidated the original routine sample, substitutes an on-site evaluation of the problem or waives the requirement on a case-by-case basis. S. Environmental Protection Agency, Washington, DC, December 1990, pp. 23–25. 12 Distribution System Sampling Population Served Minimum Number of Samples <5000 5000–100,000 100,000 1 per month 1 per 5000 population per month 1 per 10,000 population per month Source: Guidelines for Drinking-Water Quality, Vol.