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All water samples will be collected in an order such that those parameters most sensitive to <br /> volatilization will be sampled fust A general order of collection for some common groundwater <br /> parameters is as follows: <br /> • Volatile Organic Compounds (VOCs) <br /> • Total Organic Halogens (TOH) <br /> • Total Organic Carbon(TOC} <br /> • Extractable Organics <br /> • Total Metals <br /> + Dissolved Metals <br /> • Phenols <br /> • Sulfate and Chloride <br /> • Nitrate and Ammonia <br /> * Turbidity <br /> All samples from the same well shall be collected immediately after purging or when the well <br /> recovers to 70 percent of the original water column height. All samples from one sampling set <br /> from a single well should be collected on the same day <br /> All chemical sample handling and storage will be conducted under the direction of HETI's <br /> consulting analytical chemist All laboratory chenucal testing will be accomplished by a state <br /> approved analytical laboratory <br /> All water samples will be held at VC by packing them in a water-tight container inside an ice <br /> chest and covering with hard shelled "blue iceTM" In no event shall the time between sample <br /> collection and delivery to the contract laboratory be greater than 72 hours Preservatives will <br /> not be added to any sample by the sampling crew,unless instructed by the consulting analytical <br /> chemist If added in the field, preservatives shall be supplied by the contract analytical <br /> laboratory No one will open the samples other than laboratory personnel who will perform <br /> the specified chemical analyses <br /> If it is necessary for samples or sample ice chests to leave the immediate control of the <br /> sampling crew prior to delivery to the laboratory or laboratory courser, such as shipment by a <br /> common carver (e g, UPSTM), a custody seal will be placed on each sample container and/or <br /> sample chest. Custody seals will be placed to ensure that the samples have not been tampered <br /> with during shipment and will contain the samplers signature, the date and time the seal was <br /> emplaced <br /> I <br /> P , <br /> i <br /> I <br /> , <br /> II , <br /> ,I, I I I I y oI,q 11 I`,i i IY I II I c <br />