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} 1 <br /> 1 Page 4 <br /> groundwater: Underground water that fills Department of Health Services and/or the <br />' pores between particles of soil, sand and U S Environmental Protection Agency that <br /> gravel or openings in rocks to the point of represents the level of a stibstance in <br /> saturation Where groundwater occurs in drinking water that may present a health <br />' sufficient quantity, it can be used as a risk when exceeded, also known as "drink- <br /> source of water supply ing water standards" When contaminant <br /> levels rise above MCLS, DISC recommends <br />' parts per billion (ppb): A level of concen- against consuming the water and requests <br /> tration expressed as weight per unit of vol- the water supplier to take measures (such <br /> ume For example, if one drop of pure TCE as treatment or disronttnued use) to reduce <br /> t is mixed in an average size competition contaminant concentrations in the water <br /> swimming pool, the water will contain <br /> about one part per billion TCE volatile organic compound WOO: a car- <br /> bon containing compound that evaporates <br /> State Maximum Contaminant Levels (becomes a gas) readily at room tempera- <br /> (MCLs): The concentration of a contami- ture <br />' nant established by the California <br /> California Environmental Protection Agency <br /> Department of'Toxic Substances Control <br /> 10151 Croydon Way, Suite 3 <br />' Sacramento, CA 95827 <br /> 1 <br />' Ar AMON: <br /> Contains important information regarding a groundwater assessmMot bcrrsg <br /> conducted in the Lodi area. If you are the property owner but not the <br /> resident of the properfy,please forward this information. <br />