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2.04.7 Hydrology Description <br />Total dissolved solids and electro- conductivity diminish as functions of <br />peak flows due to the diluting effect of run -off events. The pH values or <br />acidity of surface waters usually remain stable during peak flows and <br />either increase during low flow due to increased concentrations of caliche <br />derived soluble material, or decrease due to higher concentrations of <br />humic material, depending upon vegetation influences on the drainage <br />basin. <br />The first quarter 2010 samples from Reed Wash were tested for benzene, <br />toluene, ethylbenzene, and xylenes (BTEX), polycyclic aromatic <br />hydrocarbons (PAH), and methyl tertiary butyl etherd (MTBE). None of <br />the compounds were present in Reed Wash. <br />Permit Application 2.04 -20 04/11 <br />