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. Y <br /> RMA 239 <br /> _ y :� . <br /> GROU -W TE O ORIN ND SAMPLING PROCEDURF—S <br /> Prior to sampling, the depth to water was measured in all monitoring wells using an electronic <br /> immersion probe. All measurements were read to the nearest 0.01 foot. If free product was present, <br /> the depth to free product and the depth to water were measured using an interface probe and an <br /> observation sample was collected with a clear teflon bailer for confirmation. No analytical samples were <br /> collected from monitoring wells containing more than 0.25 inch of free product. <br /> The monitoring wells were sampled on June/, 1190. Prior to purging, each well was checked with a <br /> _-.. clear teflon hailer in order to observe the possible presence of floating hydrocarbons. Purging%as <br /> accomplished using a stainless steel or teflon bailer. The bailer was thoroughly cleaned prior to each <br /> sampling using a trisodium phosphate solution followed by a 10% methyWcohol solution, and then <br /> rinsed twice with potable water. The wells were purged prior to sampling until pH,conductivity,and <br /> temperature values stabilized. Generally, this resulted in the removal of approximately 3 to 5 well <br /> volumes of ground water from each weL during the purging process. The water obtained from purging <br /> was placed in labeled 55-gallon drums and stored on-site. The bailer line was replaced after each <br /> sampling. Samples recovered from each well were decmnted into two appropriately prepared and <br /> - labeled 40-ml volatile organic analysis (VOA) bottles. A travel blank (numbered as MW-A) and a <br /> duplicate sample from MW-21 were also submitted for quality assurance. The sample bottles were <br /> r, immediately placed in an ice chest and maintained at 4°C until delivery to a State of California licensed <br /> laboratory. Routine chain-ef-custody procedures were employed. <br /> A i <br />