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Groundwater SampUng SOP Revision Na '0 Date-January 01.1995 Page. 4 of 5 SAMPLE HANDLING : It is critical that proper custody procedures be followed throughout all phases of sample collection and handling Some specific points of concern are as follows The samples from a particular site must never be commingled with samples from another site Samples from several sites must never be combined in the same sample cooler Each sample group must also be under separate documentation ( i e, A COC must be generated for each site and for each sampling event) The Site Manager as well as the individual who releases the samples to the transporter must follow up to see if the samples were received at the laboratory facility QUALITY ASSURANCE QUALITY CONTROL : • Trip Blanks will be utilized to verify that handling and transportation activities of the empty sample containers and collected samples has not contaminated the groundwater samples Trip blanks will be prepared and dispatched by the analyzuig Laboratory j Trip blanks will accompany the empty sample containers through sampling and return shipment of samples to the Laboratory . • Equipment Blanks will be collected, in field, to assess the completeness of decontamination procedures for precleaned equipment and field cleaned equipment j Equipment blanks will consist of pouring analyte-free water over decontaminated sampling equipment and collecting the nnsate into the appropriate prepreserved containers • Dino tes will be collected to assess the representativeness and variability inherent in the sampling process They shall be obtained by DUPLICATING (simultaneously or in rapid succession)the entire sample acquisition technique that was used to obtain the first sample DOCUMENTATION : Documentation is an essential part,of sample collection therefore field logbook, field forms, sample labels, and COC records must be complete and accurate At a minimum, the following information must be included in the logbook • Equipment used to purge the well,include pump type and Sow-rate if applicable ! • Volume of water purged from the well • Complete description of the decontamination procedures used to clean the sampling equipment If the ,equipment was pre-cleaned at the warehouse or laboratory the lot f as klociatedl with thifs cleaning I must be recorded in the logbook. ;I II e I II I ,11 ISI ` I I I I If I I• f f II ' lIII ! I 11 ,f` I r i! n i fi �i I i !f 'I f� i! II If I f III I � II fE t li c CAGWSOP DOG I ' I E` I I 'tt A I �1 111 f l e t III I j I I!i !II E ( f I II I II IIf 1 II �I I� Intl E II II SII II i li 19f I I tI If f I IF Il fel 'l li I II t� i' II'if ° II{I I liil III If 1 I 1 1 its li ' fl 1