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Yy W� <br /> k, <br /> yds <br /> fly <br /> { 2.8.1 Two soil borings will be drilled to <br /> installation of groundwater monitoring we lls.vi� he <br /> :hese wefr lls <br /> will be completed at a depth of approximately <br /> ' et <br /> below grade. Two additional20 foot oil borings will35 belocated adjacent to tank pit A. Drilling will be <br /> conducted by Osterberg and Stewart under C57 license no. <br /> 446670 using a hollow stem auger rig. The proposed boring <br /> and well locations are plotted on Figures 2 and 3. The <br /> wells will be constructed of two inch diameter F480 PVC <br /> i � <br /> screen/casing and completed as shown on Figure 5. <br /> 2.8.2 Drill cuttings will be logged continuously for <br /> characterization o_' ^ontamination and soil type using the <br /> Unified Soil Classification System (Appendix TI) . <br /> Descriptions of soils encountered and monitoring well _ <br /> construction details will be recorded on boring/well IOQ2 <br /> ' <br /> '"f and included within the assessment report. Soil samples <br /> will be collected at five foot intervals. <br /> Sample <br /> Wit collection will begin at a depth of five feet; no soil <br /> samples collected below the groundwater table W-11 be <br /> submitted for laboratory analysis. <br /> Soil samples collected will be monitored for organic <br /> i:. vapors by placing a small amount of representative <br /> material in a sealed container, tnea measuring the <br /> concentration of volatiles in tate container head space of <br /> # the container with a photoionization detector <br /> ( <br /> calibrated to benzene. The values obtained at each <br /> measurement point will be recorded on the boring logs. <br /> + Soil cuttings generated during the drilling ,process Will <br /> also be screened for the presence o:E volatile organics <br /> constituents using a photoionization 6atector. <br /> Soil samples submitted for analysis will be selected based <br /> on obvious signs of contamination (i.e. PID readings and <br /> soil discoloration). The sample recording the highest PID <br /> reading will be analyzed to determine contamination <br /> levels. Two "clean" confirmation samples, representing a <br /> 10 foot interval, will be collected and analyzed to <br /> determine the vertical extent of soil contamination. Due <br /> to the high probabilitythat <br /> groundwater has been impacted <br /> r at this site, analytical results for the soil sample <br /> ¢ collected from the top of the capillary fringe will hq of <br /> particular importance since any free productpreC_Axt wsll <br /> collect along this boundary. The samplF, will be <br /> collected, preserved and transported une'ar chain-of- <br /> custody protocol in accordance with Wa,erWork's Soil <br /> Sampling Protocol (Appendix III). Select :3mples will be <br /> analyzed for benzene, toluene and xylenes (b^X) and total <br /> petroleum hydrocarbons (TPH).---as..._gasaa.ine-by--E A--8020-and- -- --- -- -- - - <br /> methodology, respectively. in addition, t a samples <br /> - f collected from the borings around tank g Pit A will be <br /> analyzed for oil and <br /> grease by EPA.met;had 418.1. <br /> t <br /> � 3 <br /> � y <br />