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V % �J <br /> Woodward-Clyde <br /> V <br /> V <br /> 2.0 <br /> SCOPE OF WORK <br /> V <br /> ` 2.1 SOIL BORINGS <br /> A truck mounted hollow stem auger drill rig will be used to advance three soil borings (see <br /> Figure 3 for proposed locations) .to a total depth of 50 feet below ground surface (bgs). <br /> Samples will be collected by driving a Modified California Sampler into the soil formation <br /> with a 140 pound safety hammer failing a distance of 30 inches. Samples will be collected <br /> at 5 feet bgs below the tank elevation and every five feet thereafter. If a change in lithology <br /> L or groundwater is encountered, an additional sample will be collected as soon as possible. <br /> �. Samples will be screened in the field for total petroleum hydrocarbons using an immunoassay <br /> technique, following EPA Method 4030. If the samples at 45 feet bgs and 50 feet bgs in a <br /> L boring do not show any indications of being impacted with petroleum hydrocarbons, the <br /> boring will be backfilled with either cement &Lgund or bentonite chips. <br /> V <br /> If either of the last two samples from a boring show indications of being impacted with <br /> petroleum hydrocarbons, the boring will be advanced and additional samples will be collected <br /> every 5 feet. The boring will continue to be advanced until two consecutive samples show <br /> no indications of being impacted with petroleum hydrocarbons. If groundwater is <br /> encountered, the boring will be completed as a groundwater monitoring well. <br /> A set of standard field methodologies are included in Appendix B. <br /> 2.2 FIELD DATA COLLECTION <br /> Soil samples collected will be observed and described. Headspace measurements of each <br /> sample will also be taken. Immunoassay field screening for TPH will be performed on <br /> selected samples following EPA Method 4030. All soil descriptions, headspace readings, <br /> and field screening results will be recorded on a boring log. A boring log will be prepared <br /> for each boring advanced. <br /> 9054/YJAX2.M(03-13-95)sAC 2-1 <br />