Laserfiche WebLink
G <br /> is To collect a representative sample of the groundwater, stagnant water within the well casing <br /> and filter material must be purged and fresh aquifer water allowed to replace it. The water is <br /> purged frot,a the well by pumping or bailing at least three well volumes. Well volumes are <br /> calculated by measuring depth to groundwater to the nearest 001 foot upon arrival at the well <br /> before any purging has begun. Groundwater samples are collected only after pin'King has <br /> been of sufficient duration for pH, temperature, and electrical conductivity to stabilize. When <br /> purging low-yield wells, the wells are purged to dryness. When the well recovers to 80% of <br /> the depth measured upon arrival, samples are collected <br /> Field sampling logs maintained for each well include• <br /> ■ Mom6onng well identification <br /> ■ Static water level,before and after pumping <br /> ■ Well depth <br /> Condition of water pnor to purging(e g,amount of free product) <br /> • Purge rate and volume <br /> • pH, temperature,and conductivity during purging <br /> ■ Time purged <br /> • Time of sample ecdllection <br /> ■ Samphng method <br /> ■ Name of sampler <br /> a Chmatic conditions <br /> Wa%-r samples are collected usi ig clean teflon bailers. All equipment that contacts samples is <br /> thoroughly cleaned be&=arrival at the site and between sampling events. <br /> `Water is collA66 in clsan ltdimiatary4upphed containers, labeled,placed immediately mto an <br /> ice client ps+ d to 4°C,and transported to Clayton's laboratory for analys>s. One trip <br /> blank will be ftaa>slted in accordance with our quahty assuisnce/quatity control(QAIOO <br /> lrogranL <br /> All samples are collected in such a manner so as to mintmfre the volar liz atian of a sample <br /> due to agitation and/or transfer from bailer to sample contaumr. Samples are collected so <br /> that ornitaminarits most sensitive to volattliratwn are sampled first <br /> 7 <br />