ARCHIVED REPORTS_XR0002453 - Laserfiche WebLink

Home Browse Search

f All purging equipment will be thoroughly decontaminated between each Well,using the procedures previously i described at the beginning of this section. • During sample collection for volatile organic analysis, the amount of air passing through the sample is mm unized- This helps prevent the air from stripping the volatiles from the water Sample bottles are filled by slowly running the sample down the side of the bottle until there is a convex meniscus over the mouth of the bottle The lid rs carefully screwed onto the bottle such that no air bubbles are present within the bottle If a bubble is present, the cap is removed and additional water is added to the sample nand t'�p�resealing the sample container, if bubbles still are present inside,the samecontainer ure is repeated with a new container Laboratory and field handling procedures way be monitored, if required by the client or regulators,by including quality control (QC) samples for analysis With the graeindwater samples Examples of different types of QC samples are as follows • Trip blanks are prepared at the analytical laboratory by laboratory personnel to check field handling procedures Trip blanks are transported to the project site in the same manner as the laboratory-supplied sample containers to be filled. They are not opened, and are returned to the laboratory with the samples collected_ Trip blanks are analyzed for p urgeable organic compounds • Equipment blanks are prepared in the field to determine if deoontanunation of field sampling equipment has been effective The sampling equipment used to collect the groundwater samples is rinsed withlled water the which is then decanted into laboratory-supplied containers The equipment blanks are transported laboratory,and are analyzed for the,same chemical constituegts as the samples collected at the site ,r Duplicates are collected at the saltie time that the standard groundwater samples are being collected and are • analyzed for the same conipounds in order to check the reproducibility of laboratory data. They are typically • only collected from one well per sampling event. The duplicate is assigned an identification number that will not associate it with the source Well Generally, trip blanks and field blanks check field handling and transportation procedures Duplicates check laboratory procedures The configuration of QC samples is determined by Clearwater depending on site conditions and regulatory requirements � revised Apel 4,2002 CiEARWATER GROUP(GWS)