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I All water samples will be collected in an order such that those parameters most sensitive to volatilization will be sampled first. A general order of collection for some common groundwater parameters is as follows: • Volatile Organic Compounds (VOCs) • Total Organic Halogens (TOH) • Total Organic Carbon(TOC} i • Extractable Organics • Total Metals • Dissolved Metals • Phenols n' • Sulfate and Chloride • Nitrate and Ammonia • Turbidity All samples from the same well shall be collected immediately after purging or when the well recovers to 70 percent of the original water column height. All samples from one sampling set from a single well should be collected on the same day. S All chemical sample handling and storage will be conducted under the direction of HETI's consulting analytical chemist. All laboratory chemical testing will be accomplished by a state approved analytical laboratory. p All water samples will be held at 41,C by packing them in a water-tight container inside an ice p chest and covering with hard shelled "blue iceT"'". In no event shall the time between sample collection and delivery to the contract laboratory be greater than 72 hours. Preservatives will not be added to any sample by the sampling crew,unless instructed by the consulting analytical chemist. If added in the field, preservatives shall be supplied by the contract analytical ; laboratory. No one will open the samples other than laboratory personnel who will perform the specified chemical analyses. If it is necessary for samples or sample ice chests to leave the immediate control of the ! sampling crew prior to delivery to the laboratory or laboratory courier, such as shipment by a common carrier (e.g., UPSTM), a custody seal will be placed on each sample container and/or i sample chest. Custody seals will be placed to ensure that the samples have not been tampered with during shipment and will contain the samplers signature, the date and time the seal was emplaced. t 12 k i