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Groundwater Sampling SOP <br /> Revision Na :0 <br /> Date January Ol, 1995 <br /> Page 4 of 5 <br /> SAMPLE HANDLING <br /> It is critical that proper custody procedures be followed throughout all phases of sample <br /> collection and handling Some specific points of concern are as follows The samples <br /> from a particular site must never be commingled with samples from another site Samples <br /> from several sites must never be combined in the same sample cooler Each sample group <br /> must also be under separate documentation ( i e , A COC must be generated for each site <br /> and for each sampling event) The Site Manager as well as the individual who releases the <br /> samples to the transporter must follow up to see if the samples were received at the <br /> laboratory facility <br /> QUALITY ASSURANCE QUALITY CONTROL <br /> • Trip Blanks will be utilized to verify that handling and transportation activities of the <br /> empty sample containers and collected samples has not contaminated the groundwater <br /> samples Tnp blanks will be prepared and dispatched by the analyzing Laboratory <br /> Trip blanks will accompany the empty sample containers through sampling and return <br /> shipment of samples to the Laboratory <br /> • E uu ment Blanks will be collected, in field, to assess the completeness of <br /> decontamination procedures for precleaned equipment and field cleaned equipment <br /> Equipment blanks will consist of pouring analyte-free water over decontanunated <br /> sampling equipment and collecting the rinsate into the appropriate prepreserved <br /> containers <br /> • Duvllicates will be collected to assess the representativeness and variability inherent in <br /> the sampling process They shall be obtained by DUPLICATING (simultaneously or <br /> in rapid succession)the entire sample acquisition technique that was used to obtain the <br /> first sample <br /> DOCUMENTATION : <br /> Documentation is an essential part of sample collection therefore field logbook, field <br /> forms, sample labels, and COC records must be complete and accurate At a minimum, <br /> the following information must be included in the logbook <br /> Equipment used to purge the well, include pump type and flow-rate if applicable <br /> Volume of water purged from the well <br /> Complete description of the decontamination procedures used to clean the sampling <br /> equipment If the equipment was pre-cleaned at the warehouse or laboratory the lot <br /> is associated with this cleaning must be recorded in the logbook <br /> CAGWSOP Doc <br />