b'STORMWATERCATALOGTesting of Park Environmental Equipment StormTrooper Interceptor _________________________________________________________________________________________________________ 2.26Total Dissolved Solids (TDS)are solids in water that can pass through a filter (usually with a pore size of 0.45 micrometers).TDS is a measure of the amount of material dissolved in water.TDS is generally used to estimate the quality of drinking water and only applies to stormwater in abnormally high concentrations. 2.27Total Petroleum Hydrocarbons (TPH)the measurable amount of petroleum-basedhydrocarboninanenvironmentalmedia.EPAmunicipalNPDES stormwater permits generally have no numeric effluent limits for oil and grease, howeverNPDES forwastewaterdischargepermits is10-15mg/L.Expected sources of oil and grease in stormwater, such as parking lots and gas stations rarely have oil and grease concentrations that exceed 5 mg/L. 2.28Biochemical Oxygen Demand (BOD) - is a measure of the amount of oxygen that is consumed by the bacteria as they decompose the organic components of waste and relies on the accurate determination of oxygen levels over a period of five days.EPA permits generally have no numeric effluent limits for stormwater, butBODconcentrationsgreaterthan250mg/Lareusuallyunacceptableby municipalities in wastewater. 2.29Chemical Oxygen Demand (COD) - is often measured as a rapid indicator of organicpollutantinwater.Itisnormallymeasuredinbothmunicipaland industrial wastewater treatment plants and gives an indication of the efficiency of the treatment process. COD is measured on both influent and effluent water. The efficiencyofthetreatmentprocessisnormallyexpressedasCODRemoval, measured as a percentage of the organic matter purified during the cycle. 2.30Total Kjeldahl Nitrogen (TKN) - Total Nitrogen is the sum of nitrate (NO 3 ), nitrite (NO 2 ),organicnitrogenandammonia(allexpressedasN).Notethatfor laboratory analysis purposes, Total Kjeldahl Nitrogen (TKN) is a test performed that is made up of both organic nitrogen and ammonia. - 8 - 8-10354 INFO@PARKUSA.COM|888-611-7275|WWW.PARKUSA.COM'