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• Clayton I\1[RO"i[Nfi[ II)N%, 141% •w been of sufficient duration for pH, temperature, and electrical conductivity to stabilize. When purging low-yield wells, the wells are purged to dryness When the well recovers to 80% of the depth measured upon amval, samples are collected P Field sampling logs maintained for each well include ! • Monitoring well identification • Static water level, before and after pumping �.. Well depth • Condition of water prior to purging (e g, amount of free product) y • Purge rate and volume _. pH, temperature, and conductivity during purging • Time purged • Time of sample collection • Sampling method • Name of sampler Climatic conditions Water samples are collected using clean teflon or disposable bailers. All equipment that contacts samples is thoroughly cleaned before arrival at the site and between sampling events i Water is collected in clean laboratory-supphed containers, labeled, paced immediately into an ice chest pre-cooled to 4•C, and transported to Clayton's laboratory for analysis One trip blank will be furnished in accordance with our quality assurance/quality control (QA/QC) program. All samples are collected in such a manner so as to minimize the volatilization of a sample due to agitation and/or transfer from bailer to sample container. Samples are collected so that contaminants most sensitive to volaWizatton are sampled first Preservatives are not added to any sample, unless instructed. If requested, they are supplied by Clayton's laboratory All sample containers are labeled in the field. Labels contain the following information project name, sample identification number, project number, date and time of collection, and sampler's initials. i.w Under no circumstances are sealed sample containers opened by anyone other than the _. laboratory personnel who perform the requested analyses. If it is necessary for samples or sample chests to leave the immediate control of the sampler prior to delivery to the laboratory, for example during shipment by Federal Express, a custody seal is placed on each sample container and/or sample chest to ensure that the samples have not been tampered with during transportation The custody seal is signed by the sampler, and the date and tune that the seal was placed is recorded. The elapsed time between sample collect.on and delivery to the laboratory never exceeds 48 hours. Water samples are not held for more than 14 days prior to analysis and are kept at 4°C at all times 4 env