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s Clayton F\11�U\ttE\TtL IXSti SI.'Lfi1'75 by pumping (or bailing) and surging until water turbidity and specific conductance stabilize. In some cases, where wells are installed in low permeability formations and the wells purge dry, the well is allowed to recover and is purged dry three times. Clean tap water is introduced into the well if it does not recover rapidly enough. Pending results by laboratory analysis, purge water from well development and sampling is placed into DOT-approved drums, labeled with the name of the site, address, well number, and left at the site. Uncontaminated water may be disposed of by the client. Water found to contain levels of contaminants above local or state action levels requires that the client dispose of it in accordance with hazardous waste requirements. At the client's request, we can assist with the disposal of contaminated purge water. GR_^OUNIDWATER SAMPLING i To collect a representative sample of the and filter material must be purged and freshaquiferwater allowed to r pia a thundwater, staant water within te The casing water is Purged from the well by pumping or bailing at Ieast three well volumes. Well volumes are F calculated by measuring depth to groundwater to the nearest 0.01 foot Capon arrival at the well before any purging has begun. Groundwater samples are collected only after purging has been of sufficient duration for p_-i, temperature,and electrical conductivity to stabilize. When purging low yield wells, the wells are ur ed to dryness. ]30% of the depth measured upon arrival, samples are calcted.When the well recovers to E ~1 Field sampling logs maintained for each well include: € • Monitoring well identification { l ' Static water level, before and after pumping i • Well depth �. Condition of water prior to purging (e.g., amount of free product) ,�. Purge rate and volume E l PH, temperature,and conductivity during purging • Time purged Time of sample collection '' . •. Sampling method a. Name of sampler H o Caimatic conditions Water samples are collected-using cleanteflonbailers. All equipment that contacts samples is thoroughly cleaned before arrival at the site and between sampling events. ( "i ice ater,is chest collected in clean laboratory-supplied containers, labeled,. laced immediately pre-cooled to 4 C, and transported to Clayton's laboratory for analysis. pne trip into �n blank will be fumished in accordance with our quality _F assurance/qualiti control (QA/QC)program. All samples are collected in.such a manner so as to minimize the volatilization.of a:sample E due to agitation and/or transfer from bailer to sample container. Samples are collected so that contaminants most sensitive tO volataltzation are sampled brat. �I rt �.. aoLood mp t 3