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TREADWELL & ROLLO <br /> C A sample drawn from plumbing on municipal or domestic wells must be taken at <br /> the access valve closest to the well and upstream of any water softening or <br /> chlorination input <br /> D The sample container and cap will be laboratory prepared containers. The <br /> container will then be filled to overflowing (except when sampling for <br /> bacteriological analysis or when chemical preservatives have been added to the <br /> sample container) to avoid trapping air at the top of the container Splashing of <br /> the water in the sample container and exposure to the atmosphere will be <br /> mimmuzed during sampling A container cap will be screwed on tightly <br /> immediately after filling the sample container Samples for volatile organics <br /> analysis (VOA) will be collected in duplicate in VOA bottles and checked to be <br /> sure no headspace is present in the sample container Sample preservation <br /> procedures are presented below in Section 2 5 <br /> E Where more than one well within a specific field or site is to be sampled, the <br /> sampling sequence will begin with the well having the least suspected <br /> contamination Successive samples will be obtained from wells of increasing <br /> suspected contamination If the relative degree of suspected contamination at <br /> each well cannot be reasonably assumed, sampling will proceed from the <br /> perimeter of the site towards the center of the site The sampling sequence will be <br /> arranged such that wells are sampled in order of increasing proximity to the <br /> suspected source of contamination <br /> F A map will be used in the field to record sample locations A field log book or <br /> data sheets will be used to record the following information <br /> o Sample number/name <br /> o Date and time sampled <br /> o Sample location (well number) <br /> o Depth at which sample was taken <br /> o Conditions of source (flowing, pumping, etc ) <br /> o Extraordinary circumstances (if any) <br /> o Name of collector <br /> a Results of field measurements (temperature, pH, specific conductance) <br /> 2.2 Sample Filtration <br /> When the analysis of metals in the groundwater is required, field filtration of each <br /> sample will be performed using a 0 45 micron filter and filter press, prior to transferring <br /> the sample to the sample container and preserving it with nitric acid Alternatively, the <br /> • A-2 <br /> 110707{}9 PJC 1 April 1994 <br />