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Groundwater Sampling SOP <br /> Revision No 0 <br /> Date January 01, 1995 <br /> Page 3 of <br /> Utilization of a submersible pump is the preferable method of purging as repeatedly <br /> lowering the bailer into the monitoring well may oxygenate the formation waters and <br /> change the chemistry of the groundwater <br /> LANYARDS : <br /> • Lanyards may be disposable (braided or monofilament nylon) or reusable ( stainless <br /> steel Teflon coated) <br /> • A disposable lanyard must be changed for each monitor well But the same lanyard <br /> may used for purging and sampling operations without decontamination between <br /> purging sampling activities <br /> • Reusable lanyards shall be decontaminated between monitoring wells but do not <br /> require between purging and sampling operations <br /> • Lanyards must never come in contact with the ground or other surface which may <br /> contaminate the lanyard <br /> SAMPLE COLLECTION ORDER : <br /> Samples shall be collected from the least to the most contaminated sampling locations <br /> within a site This information can be obtained from historical data, the Site Manager, or <br /> OVA readings at the site <br /> Unless field conditions justify other sampling regimens, samples shall be collected in the <br /> following order <br /> a Volatile Orgamc Contaminants (VOCs) <br /> b Extractable Organics [ includes Total Recoverable Petroleum Hydrocarbons (TRPH), <br /> & Grease, Pesticides and Herbicides), <br /> c Total Metals, <br /> d Dissolved Metals, <br /> e Microbiological, <br /> f Inorganics (including Nutrients, Demands and Physical Properties); and <br /> g Radionuclides <br /> SAMPLE PRESERVATION <br /> Samples must be preserved with the appropnate preservative and maintained on ice A <br /> laboratory certified to perform hazardous waste testing by the State of California <br /> CAGWSOP DOC <br />