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w <br /> y <br /> r <br /> 5 <br /> A maxvrrur . ee qi�, �a le ,wrll be selected from each bareh lc d t�ni,_ rpt o it r <br /> :y ...... 1. <br /> sasriple from the stockpile,will be�dollected: Soil samples will be analyzed for total petroleum <br /> hydrocarbons as diesels' = 'fby U.S. Environmental Protection Agency (EPA) Method <br /> 3550180I5 modified, and benzene..,ethylbenzenor::toluene,tmd`:'to,*td,xyletus {a""M?by EPA <br /> Method 8020. Additional analyses may be required of the stockpile sample for disposal <br /> purposes. Tl-ie samples will be delivered to an analytical laboratory (certified by the California <br /> Department of Health Ser,-ices)within 48 hours of collection. <br /> Groundwater Sampling <br /> e� After the boreholes reach 5 feet below first-encountered groundwater,a groundwater sample <br /> will be collected from each borehole using the"hydropunch" technique. This technique utilizes <br /> a disposable weff screen to collect groundwater at a specific depth. 7be hydropunch tool is <br /> i driven into undisturbed soil by hammer or hydraulics. The protective well casing is pulled back <br /> to expose the screened interval. The groundwater sample is collected by bailer after the <br /> hydropunch casing is filled wit.'t water ( rrt-- - jfff ax.nple�virRl T>"e ariaTyz -ffi 7?11;D <br /> E1i?A�A�iethods 35It1/8015.rttddi�.anc"i.$02 ``res°pectively. '1 - ' f <br /> In addition to the hydropunch sample,groundwater samples will be collected from each of <br /> the three existing monitoring wells on the site. At least three casing volumes of groundwater will <br /> be purged from each well prior to sampling. The pH, temperature, and electrical conductivity <br /> of the water will be measured periodically during the purging. <br /> The groundwater sample will be obtained with disposable bailers equipped with a bottom <br /> emptying valve. To release water from the bailer with minimal aeration, the protrusion on rhe <br /> bottom-emptying device actuates the bottom check valve and regulates the flow into the sample <br /> l <br /> bottle: <br /> The sample bottle will be obtained precleaned from the analytical laboratory, and it will be <br /> ! specific with respect to size and material to the type of analysis to be performed_ The bottle will <br /> be carefully filled to the very top, in order to create a meniscus, and sealed with a teflon lined <br /> cap (septa). Thew precautions aid in eliminating air from the sample. The sample will be <br /> j visually inspected to ensure that no air bubbles remain within. Samples will be labeled, stored, <br /> and transported in cooled ice chests to the analytical laboratory under proper chain-of-custody <br /> procedures. <br /> -__..,Purged..groundwater-will be-stored in-55-gallon drums on site-prior to.disposal:--Disposal_ --- ------ - -- -- -- <br /> --- - of groundwater will be the responsibility of ARCO. <br /> i <br /> REPORT PREPARATION <br /> A report will be prepared following completion of the field activities described above. The <br /> report will describe the field methods used to drill the boreholes;hydropunch technique,and the <br /> sampling procedures. Analytical results will be presented and discussed, and recommendations <br />