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Groundwater Sampling SOP Revision Na .0 Date January 01, 1993 Page•3 of 5 LANYARDS : • Lanyards may be disposable (braided or monofilament nylon) or reusable ( stainless steel Teflon coated) • A disposable lanyard must be changed for each monitor well But the same lanyard may used for purging and sampling operations without decontamination between purging samphng activities • Reusable lanyards shall be decontaminated between monitoring wells but do not require between purging and sampling operations • Lanyards must never come in contact with the ground or other surface which may contaminate the lanyard SAMPLE COLLECTION ORDER : lin locations Samples shall be collected from the least to the most contaminated sampling within a site This information can be obtained from historical data, the Site Manager, or OVA readings at the site Unless field conditions justify other sampling regimens, samples shall be collected in, the following order a Volatile Organic Contaminants(VOCs) b Extractable Organics [ includes Total Recoverable Petroleum Hydrocarbons (TRPH), & Grease, Pesticides and Herbicides], c Total Metals, d Dissolved Metals, e Microbiological, f Inorganics(including Nutrients, Demands and Physical Properties), and g Radionuclides SAMPLE PRESERVATION : Samples must be preserved with the appropriate preservative and maintained on ice A laboratory certified to perform hazardous waste testing by the State of California 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 CAGVO"MC