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W <br /> ��' ,•�, :�,'�,� � '_. � � � -sem `'c � ". � <br /> r+ <br /> GROUNDWATER SAMPLE ANALYSIS RESULTS <br /> Elevated levels of BTEX,TPHG,and TPHD were recorded in the groundwater sample collected <br /> from the bottom of tank pit 1 (RET?I-B-9.5'). Total lead (TL) was not detected above State <br /> Maximum Contamination Levels (MCL's) for drinking water. <br /> 6.0 PROPOSED ADDITIONAL ASSESSMENT <br /> SOILS <br /> To assess the lateral and vertical extent of soil contamination beneath the site WaterWork <br /> proposes to drill five soil borings in the tank and product line areas. The borings will be drilled <br /> to a maximum of 10 feet below grade (Figure 3). Confirmation of clean soil will be verified <br /> - by soil analysis. <br /> All borings will be sampled at five foot intervals using a California modified spiut-spoon sampler <br /> with brass liners. The material from one sample ring will be described and field screened with <br /> at photoionization detector(PID)for passible volatile organic content. The second ring will be <br /> sealed at each end with Teflon tape-and a plastic cap. The cap will be sealed with duct tape and <br /> the sample will be preserved on ice and transported under strict chain-of-custody procedures to <br /> a State certified laboratory. <br /> Between sampling events, equipment will be cleaned using a three wash bucket wash system. <br /> In this system,the rings and samplers will be scrubbed with a brush in a bucket of tag water and <br /> detergent, then rinsed in a bucket of tap water and a final rinse of distilled water. <br /> " Borings will be drilled using an 8 inch hollow-stem auger. No fluids will be used during drilling <br /> activities. Following completion of drilling, bentonite will be placed in the bottom of each <br /> boring. The boring will then be backfilled to grade with native cuttings. Should hydrocarbon <br /> —=--------- --- --- ----- <br /> impacted soils be encountered, the boring will be bacilled-with neat cement to grace. — <br /> One soil sample from each boring will be submitted for laboratory analysis. Samples selected <br /> will be those exhibiting the highest PID reading. The samples collected near tank pit 1 and the <br /> xe o9o�.wr 4 <br />