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<br /> Monitoring.Well Filter Pack and Slot Selection
<br /> The size of the filter pack that will be placed adjacent to the well screen will be determined
<br /> by the project manager, based on an estimation of the distribution of grain size in the
<br /> _. formation which is likely to be encountered within the uppermost saturated zone at the
<br /> site. Available geologic information will be utilized in the selection of the grain size. The
<br /> filter pack will be selected such that it will permit the development of a zone of higher
<br /> _ hydraulic conductivity adjacent to the well screen but will not allow infiltratiGn of the cngr-
<br /> grained formation into the well bore. The slot size of the well screen will be selected st!ch
<br /> that it will retain a minimum of 95% of the filter pack material.
<br /> fVlonitorin Weil De�elo went
<br /> Each monitoring well will be developed after construction by the surge and bail method
<br /> until the water produced is relatively sediment-free. If the well is bailed dry during the
<br /> development process, recharge rates will be recorded- No water or chemicals will be
<br /> introduced into the monitoring wells during well development. All development water will
<br /> be placed in 55-gallon drums on site for later disposal.
<br /> Ground Water Sampllnq
<br /> A minimum of 24 hours following well development, and after water levels have been
<br /> allowed to stabilized in the well, three to five wetted casing volumes of liquid will be
<br /> removed from each well by bailing. A liquid sample will thea be collected from each well
<br /> with a dedicated bailer, each sample will be appropriately labeled and stored on ice from
<br /> the time c. collection through the time of delivery to the laboratory. Ground water
<br /> samples will be transported to the laboratory and analyzed within the EPA-specified
<br /> holding times for the requested analyses.
<br /> Petroleum Product
<br /> if free petroleum product is present in a well, the thickness of tha product layer will be
<br /> measured. A sample of the product will be collected with a clean mailer and transferred
<br /> to an appropriate sample cont'aine'r and subsequently submitted to a California-certified
<br /> laboratory for fuel fingerprint analysis.
<br /> Analytical-Procedures
<br /> All selected soil samples are submitted, under chain-of-custody, to a state-certified
<br /> analytical laboratory for analysis of PVH-G, BTEX, EDB and organic lead. The stockpiled
<br /> soils were analyzed for total lead. Water samples are submitted, tinder chain-of-custody,
<br /> to a state-certified analytical laboratory for analysis of TPPH-G, BTEX, EDB,fecal coliform,
<br /> and organic lead.
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