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<br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />. 2\;r:TACtlr.:1.ENT A <br />CIty 01 ~an lVlarcos <br />Organic Wastewater Contaminant <br />Sampling Plan <br /> <br />103. <br /> <br />Purpose <br />The purpose of the City of San Marcos Organic Wastewater Contaminant (OWC) Sampling Plan <br />is to obtain background information on the presence of common OWCs in source water and <br />treated wastewater. The background information will be used to address safety issues <br />concerning use of reclaim water over the Edwards Aquifer recharge zone, and to determine if <br />additional sampling is needed. <br /> <br />Backeround <br />OWCs are a newly emerging class of pollutants. Many of the OWCs are known or suspected <br />endocrine disrupting compounds (EDCs). <br /> <br />Compounds <br />The sampling plan includes a variety of compounds such as pharmaceuticals, over-the-counter <br />drugs, personal care products, detergents, industrial chemicals, pesticides/herbicides, and natural <br />and synthetic hormones. <br />4-nonylphenol (detergent metabolite) <br />4-octylphenol (detergent metabolite) <br />Acetaminophen (antipyretic) <br />Acetyl-hexamethyl-tetrahydronapthalene [AHTN = Tonalide] (musk fragrance) <br />Bisphenol A [BP A] (component of polycarbonate plastics) <br />Caffeine (stimulant) <br />Carbamazepine (anti -epileptic) <br />Cholesterol (plant/animal steroid) <br />Codeine (analgesic) <br />Coprastanol (fecal steroid) <br />Cotinine (nicotine metabolite) <br />Diazinon (pesticide) <br />Estriol (reproductive hormone) <br />Fluoranthene (polycyclic aromatic hyrdrocarbon) <br />Fluoxitine (anti -depressent) <br />N,N-diethyl-meta-toluamide [DEET] (insecticide) <br />Sulfamethoxazole (antibiotic) <br />Tri(2-chloroethyl)phosphate (fire retardant) <br />Triclosan (anti-microbial) <br />Trimethroprim (antibiotic) <br /> <br />Additional Compounds <br />17a-ethynyl estradiol- (synthetic hormone) <br />17b-estradiol (natural hormone) <br />Tri(dcp)phosphate (fire retardant) <br />Beta-sitosterol <br />Etyhyl citrate (cosmetics) <br />Tributyl phosphate (fire retardant) <br />Benzophenone (fragrance fixative) <br />Diltiazem (blood pressure stabilizer) <br /> <br />November 2004 <br />