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East C ifford QAPP <br /> Section B <br /> Revision No . <br /> Date : 3/ 16/05 <br /> Page 11 of 18 <br /> Group B — DATA GENERATION AND ACQUISITION <br /> 131 . Sampling Process Design ( Experimental Design ) <br /> Two types of stormwater samples will be taken : pre-construction and post- <br /> construction . The requirements of Chapter 62-302 , April 9 , 2002 version of the <br /> SOPs will be met for field and analytical activities . For each pre- and post- <br /> construction sampling event , the samples will be tested for the following <br /> parameters : <br /> Field Measurements <br /> 1 . Temperature <br /> 2 . pH <br /> 3 . Salinity <br /> 4 , Dissolved Oxygen <br /> Laboratory Analyses <br /> 5 , Total Kjeldahl Nitrogen <br /> 6 , Nitrate- N , Nitrite- N <br /> 7 , Ammonia- N <br /> 8 , Total Phosphorus <br /> 9 , Color <br /> 10 . Biochemical Oxygen Demand ( BOD ) <br /> 11 . Total Suspended Solids (TSS ) <br /> 12 . Alkalinity <br /> The pre-construction stormwater grab samples will be manually taken within the <br /> first hour of a storm event . The storm event will be defined as one in which <br /> rainfall is within 50 % of the average rainfall in the area . The sample will be taken <br /> from an area upstream of the proposed stormwater pond . This is the best <br /> location to take the pre-construction samples because the project area does not <br /> have an existing drainage system and therefore , stormwater runoff ponds in this <br /> location until it percolates or evaporates . <br /> The post-construction samples will be composite samples taken by utomatic <br /> stormwater samplers during or immediately after rainfall events . Or e automatic <br /> sampler will be installed near the detention pond inlet pipe and the other will be <br /> installed near the pond ' s overflow weir. Each automatic sampler will be activated <br /> based on a rise in water depth in the lake . Once activated , the samplers will take <br /> flow-weighted samples at fifteen - minute intervals , for twenty-four hours , Rainfall <br /> data will be collected onsite with an associated rain gauge and compared against <br /> rainfall data obtained from the nearest weather station . However, if the lake <br /> depth drops to a predetermined level within four hours after initiating% sampling , <br /> F :\Public Works\KeithM\Stormwater Projects\Gifford East\Water Quality Monitoring Program\Quality Assurance Project Plan\DEP <br /> QAPP East Gifford Revision 3- 16-2005. doc <br />