WORK PLANS - Laserfiche WebLink

Home Browse Search

MAR 12 92 14:45 C.KC: 9163715821 � P. 1 4. Each sample will be received by the,laboratory within two days of collection. Samples will be kept in a clean ice-cooled chest. "Blue Ice" is recommended instead of ice during transport to the laboratory. All samples will be delivered to the laboratory under chain-of-custody documentation., with the original included in the ice chest. A copy of the chain-of-custody will be kept for the project file. 5. finless otherwise requested by the laboratory, no preservatives will be added to the sample. 6. The sealed sample container will be opened only by the laboratory personnel who will perform the chemical analysis. The samples will be analyzed within 7 to 14 days from their collection date depending can EPA quality control criteria appropriate for each analytical method. 7. ,lie analytical laboratory will provide laboratory quality assurancelquality control documentation. This will include results from method spike, method blank analyses, and duplicate analysis tone duplicate for every ten samples analyzed). Sample Collection i. Groundwater samples will not be collected until the well � been allowed to stabilize for 24 fours following well development. Prior to purging, the water level in the well will be measured and the well checked for free floating product. The water level in the well will be checked with an electronic well sounder. The well will be checked for free floating product by utidzing a transparent bailer to collect a liquid sample from the water surface. The liquid sample inside the bailer will then be visually examined for evidence of free floating product. The thickness of any free floating R, product layer will be recorded in the field notes. Water samples will also be inspected for the presence of odor and/or sheen. a Each well will be purged of water prior to the collection of the water sample. Three to five well volumes will be removed from the well by bailing or pumping. After three to five well volumes have been removed from the well, three successive water samples will be measured for pH, conductivity, and temperature using properly calibrated instrumentation. Well purging shall continue until the measurements from three successive water samples are constant. 3. All well purge water will be recovered and placed in 55-gallon drums. The well will be .allowed to recover to at least 80 percent of originally measured water level before a water sample is collected. 4. Equipment used for well purging will be thoroughly steam-cleaned or cleaned in soapy (TSP) water, rinsed with clean tap water, and finally rinsed with de-ionized water prior to the use in each well. .46 A-4