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S <br />ATTACHMENT 3 <br />r <br />WATER SAMPLES FROM SERVICE STATI0N SITES <br />Before samples are taken, static water level and product thickness <br />measurements are made as described in "Water Table and Hydrocarbon hioni- <br />tor Well Measurements." Wells with free product on the water surface <br />are not sampled for water quality. The presence of free hydrocarbons is <br />sufficient indication that there is contamination of the water. <br />Wells with no free hydrocarbon are sampled as follows: A well volume <br />calculation is made based upon static water level. Using a clean teflon <br />bailer, at least four but no more than ten well volumes are bailed from <br />' the well and then samples collected. <br />Each sample consists of two 40 ml Volatile Organic Analysis (VOA) vials <br />and two quart bottles of water. The VOA vials are filled with sample <br />and stablilized using 6 to 10 drops of six normal hydrochloric acid. <br />The VOA vials are used for total petroleum hydrocarbons (TPH) and tetra <br />ethyl lead (TEL) analysis, and the quart bottles are for ethylene dibro- <br />mide (EDB). If a representative of the Regional Water Quality Control <br />Board is present at the time of sampling, he is to receive a duplicate <br />sample. All samples are labeled and refrigerated on site. <br />IT sample labels and chain -of --custody forms are to be used to track all <br />+, samples and assure proper sample handling. <br />After sampling, wash the bailer in TSP and rinse three timEs with deion- <br />ized water to remove all traces of the previous sample. Replace: the <br />cord used with the bailer between each sample. <br />I <br />