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East Gifford QAPP Section B Revision No . Date : 3/ 16/05 Page 12 of 18 the samplers will shut off, since this will indicate a non -significant ra nfall event . All sampling intake points will be located near the influent pipe oreffluent weir (within ten to fifteen feet) , as applicable , and approximately mid -de th in the water column . The sample locations are shown on Figure A . 2 Pre-construction sampling will consist of three separate rainfall events (grab samples ) . Post-construction sampling will consist of six separate rainfall events (composite samples ) . All of the parameters that will be measured are for information . Since this project is a stormwater system retrofit , there is no critical parameter of concern . The purpose of the stormwater sampling is to determine the pollution removal effectiveness of the constructed stormwater system . B2 . Sampling Methods Requirements 62 . 1 Sample Collection Procedures and Methods Pre-construction stormwater samples will be collected manually . O le grab sample will be collected for each rainfall event measured . All samp es will be collected from a representative pool of stormwater ( mid depth ) and ill be collected in a large plastic container suitable for such sampling . Th a. sampling container will be properly decontaminated before each sampling evi nt . Automatic stormwater samplers will collect post-construction composite samples . Each automatic sampler will be equipped with a large plastic sample container that is properly cleaned before each sampling event . The automatic samplers will be programmed to take a flow-weighted sample every fifteen minutes . Once activated , each sampler will draw the flow-weighted sample through a Teflon tube , into its sample container every 15 minutes for approximately s x hours or until at least 4 , 800mL is collected . The composite sample containers will be thermally preserved during the collection process , then the composi a jug will be stirred and siphoned into lab-supplied bottles that have been properly chemically preserved , and the samples will be transported to the laboratory on ce in order to ensure proper preservation . The requirements of Chapter 62 -302 , April 9 , 2002 version of the S Ps will be met for field and analytical activities . B2 . 2 Equipment Needed for Sampling 1 . Pre-Construction — Large plastic sampling container with lid , small battery operated pump with Teflon or plastic suction and discharge tubing . F :\Public Works\KeithM\Stormwater Projects\Gifford East\Water Quality Monitoring Program\Quality Assurance Project Plan\DEP QAPP East Gifford Revision 3- 16-2005.doc