ARCHIVED REPORTS_XR0005851 CASE 2

Home Browse Search

• aN��en srir� * � * GROUNDWATER WELL SOP# 2007 DATE 01/26/95 7FAM SAMPLING REV # 0 0 1.0 SCOPE AND APPLICATION and need not be the same as the device used for purging Care should be taken when choosing the The objective of this standard operating procedure sampling device as some will affect the integrity of (SOP) is to provide general reference information on the sample Sampling should occur in a progression sampling of ground water wells This guideline is from the least to most contaminated well, if this primarily concerned with the collection of water information is known samples from the saturated zone of the subsurface Every effort must be made to ensure that the sample The growing concern over the past several years over is representative of the particular zone of water being low levels of volatile organic compounds in water sampled These procedures are designed to be used in supplies has led to the development of highly ' conjunction with analyses for the most common types sophisticated analytical methods that can provide of ground water contaminants (e g , volatile and semi- detection limits at part per trillion levels While the volatile organic compounds, pesticides, metals, laboratory methods are extremely sensitive, well biological parameters) controlled and quality assured, they cannot compensate for a poorly collected sample The These are standard (i e , typically applicable) collection of a sample should be as sensitive, highly operating procedures which may be varied or changed developed and quality assured as the analytical �. as required, dependent upon site conditions, procedures equipment limitations or limitations imposed by the procedure In all instances, the ultimate procedures 3.0 SAMPLE PRESERVATION, ' employed should be documented and associated with CONTAINERS, HANDLING, the final report AND STORAGE Mention of trade names or commercial products does The type of analysis for which a sample is being ' not constitute U S Environmental Protection Agency collected determines the type of bottle,preservative, (EPA)endorsement or recommendation for use holding time, and filtering requirements Samples should be collected directly from the sampling device 2.0 METHOD SUMMARY into appropriate laboratory cleaned containers Check ' that a Teflon liner is present in the cap, if required In order to obtain a representative groundwater sample Attach a sample identification label Complete a field for chemical analysis it is important to remove data sheet, a chain of custody form, and record all ' stagnant water in the well casing and the water pertinent data in the site logbook immediately adjacent to the well before collection of the sample This may be achieved with one of a Samples shall be appropriately preserved, labelled, number of instruments The most common of these logged, and placed in a cooler to be maintained at ' are the bailer, submersible pump, non-contact gas 4EC Samples must be shipped well before the bladder pump, inertia pump and suction pump At a holding time is up and ideally should be shipped minimum, three well volumes should be purged, if within 24 hours of sample collection It is imperative ' possible Equipment must be decontaminated prior to that samples be shipped or delivered daily to the use and between wells Once purging is completed analytical laboratory in order to maximize the time and the correct laboratory-cleaned sample containers available for the laboratory to perform the analyses have been prepared,sampling may proceed Sampling The bottles should be shipped with adequate packing ' may be conducted with any of the above instruments, and cooling to ensure that they arrive intact 1 I