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i CAMBRIA Sediment Lithology Lithology encountered while drilling the borings consisted primarily of silt (ML) with several smaller layers of silty sand (SM) and sand (SP) to the total explored depth of 70 fbg (Appendix B) Chemical Analyses Grab groundwater samples and selected soil samples were analyzed for TPHg by EPA Method 8015 (modified), BTEX and MTBE by EPA Method 8020, and fuel oxygenates (TBA, MTBE, ETBE, DIPE, and TAME) by EPA Method 8260B Soil Disposal Approximately 5 6 tons of soil were generated during field activities, stored onsite, and covered with plastic sheeting The soil stockpile was sampled and profiled for disposal On March 6, 2000, Manley and Sons Trucking, Inc of Sacramento, California transported the soil to Forward, Inc 's Manteca, California landfill . Well Materials Well MW-5 was constructed using four-inch diameter, Schedule 40 PVC casing with a screen slot size of 0 020-inch and 2112 Lonestar sand Screened,Interval Well MW-5 is screened from 50 to 70 fbg Monitoring well construction details are presented on Table I and recorded on the exploratory boring log (Appendix B) Well Development/Sampling Blaine developed and purged well MW-5 on March 1, 2000 and sampled the well on March 9, 2000 Blaine developed the well using surge block agitation and pump evacuation Blaine's groundwater monitoring and well development report is presented as Appendix C HYDROCARBON DISTRIBUTION IN SOIL TPHg and BTEX were not detected in soil from any of the borings MTBE was detected (by EPA Method 826013) in soil at depths ranging from 15 5 to 35 5 fbg in boring S13-2 at concentrations ranging from 0 00645 to 25 4 ppm No other fuel oxygenates were detected in soil samples The soil chemical analytical data are summarized in Table 2 and presented on Figure 2 Laboratory analytical data are presented in Appendix D 1346 4