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Groundwater Sampling SOP Revision No 0 Date January 01, 1995 Page 4 of 5 Department of Health Services (DOHS) will dispatch prepreserved sample containers for collection of samples It is essential that the samples be maintained at 4 degrees centigrade until delivery to the laboratory facility A notation must be made on the Chain of Custody form(COC) as well as in the logbook concerning sample preservation 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 analyzing Laboratory Trip blanks will accompany the empty sample containers through sampling and return shipment of samples to the Laboratory F4.uinment Bl&uks will be collected, ' in field, to assess the completeness of decontamination procedures for precleaned equipment and field cleaned equipment Equipment blanks will consist of pouring analyte-free water over decontaminated sampling equipment and collecting the rinsate into the appropriate prepreserved containers Dap,icates will be collected to assess the representativeness and variability inherent In the sampling process They shall be obtained by DUPLICAMG (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 ' F ' and flow-rate if applicable Equipment used to purge the well, include pump type , { ! r k CAGWSOP DOC r I I Ir I II {