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Oct-08-01 04 : 14P • • P. 11 <br /> approximately 10 feet bgs, the practical limit of hand augerin . This depth is anticipated to <br /> be sufficient given shallow water table conditions observed in this area. oils will <br /> continuously logged to identify structural features that may be conducive for free-phase <br /> product accumulation and screened for the presence of petroleum hydrocarbons in the <br /> subsurface. Soil will be visually logged and headspace will be screened using a PID. <br /> 3.2.2 Sequence 2: Subsequent In Situ Soil and Groundwater Sampling <br /> P n9 <br /> The type and number of soil and grab groundwater samples per borehole specified in the <br /> April 13,.2001,Work Plan remain unchanged. <br /> Solis SampleS. The depth to the water table is expected to be shallow,less than about 5 feet, <br /> leaving a short interval for the collection of two vadose zone soil samples. Therefore,one <br /> soil sample will be collected in the vadose zone;and one soil sample will be collected at the <br /> water table. <br /> Groundwater Samples. A grab groundwater sample will be collected at the water table in <br /> each boring. In addition,at the four deeper CPT borings,a grab groundwater sample will <br /> be collected from the deeper sandy sediments previously observed underneath the finer- <br /> grained sediments in the source area at a depth of about 35 to 50 feet,based on the deeper <br /> groundwater investigation work performed in 1999 and 2000 by LFR Levine-Fricke(LFR, <br /> 1999;2000). <br /> 3.3 Field Procedures <br /> The field procedures specified in the April 13,2001,Work Plan will remain unchanged, <br /> except that the following additional procedures will be implemented for the hand-auger, <br /> Geoprobe,and CPT borings. <br /> Hand-Auger Borings—Sequence 1 <br /> • Soil samples will be continuously collected and logged to identify lithology and water <br /> table conditions. <br /> • Soil samples will be field-screened for petroleum hydrocarbons using a PID and field <br /> observations(odor,color,staining,etc.). <br /> Hand-Auger Borings—Sequence 2 <br /> • Soil samples for laboratory analysis will be obtained by hand augering and collecting <br /> soil samples using a slide hammer and sample barrel fitted with a stainless steel or brass <br /> sleeve. <br /> • Grab groundwater samples for laboratory analysis will be obtained by installing a <br /> temporary well point into the water table,collecting the sample using a disposable <br /> bailer,and transferring the sample into appropriate water sample containers. <br /> Geoprobe Borings—Sequence 1 <br /> • Soil samples will be continuously collected and logged to identify lithology and water <br /> table conditions. <br /> scauw3209.DOC41 za3000 i <br />