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<br />l-" <br />CD <br />CD <br />tv <br /> <br />ppm <br />psig <br />PVC <br />RO <br />SAE <br /> <br />SAWPA <br />SIC <br />t <br />TCE <br />TDS <br /> <br />- parts per million <br />- pounds per square inch gauge <br />- polyvinyl chloride (plastic used for wastewater pipe) <br />- reverse osmosis <br />- Society of Automotive Engineers <br /> <br />- Santa Ana Watershed Project Authority <br />- Standard Industrial Classification <br />- TDS (in Tihansky's f.mnulas) <br />- Trichlorethylene <br />- total dissolved solids <br /> <br />Temporary hardness - refers to the presence of bicarbonate compounds of calcium <br />andlor magnesium. If the water is boiled or acidified, lhe bicarbonates are <br />decomposed and some hardness compounds precipitate as calcium carbonate Qr <br />as magnesium hydroxide. <br />- Total hardness is the combination of temporary and permanent hardness. <br />- United Slates Department of the Inlerior, Bureau of Reclamation <br /> <br />TH <br />USBR <br /> <br />xii <br />