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10 August 2004 <br /> AGE-NC Project No 96-0232 <br /> Page 6of10 v <br /> MW-19 to the nearest 0 01-foot relative to known National Geodic Survey Datum No C464 <br /> (NAVD88) Additionally, BPI utilized global positioning system (GPS) techniques to identify <br /> latitude and longitude for tracking wells MW-1 through MW-19 on the State Water Resources <br />' LL Control Board (SWRCB) GeoTracker database system The results of the monitoring Well survey <br /> are contained in Table 3 The surveying report (BPI Job No 97-0249) is presented in Appendix F <br /> 3 0. FINDINGS <br /> Soil boring and monitoring well installation soil descriptions were utilized to construct geologic <br /> cross section E-E' beneath the site, field data was utilized to select soil samples for laboratory <br /> analysis MTBE-impact to ground water was assessed and quantified by laboratory analysis - <br /> 3 1 SITE STRATIGRAPHY <br /> Generally, less permeable,fine sandy silts and clayey silts were encountered at depths between 5 and <br /> 10 feet bsg and between 25 and 35 feet bsg, more permeable, silty fine sands and fine to medium <br /> sands were encountered at depths between 10 and 25 feet bsg and between 35 and 50 feet bsg <br /> Boring logs are included in Appendix B General lithology beneath the site is depicted in cross- <br /> sections E-E' in Figure 3 <br /> 3 2 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL <br /> Faint hydrocarbon odor was noted at 40 feet bsg from boring P-40A, from soil boring P-42 at 30 feet <br /> bsg and between from soil boring P-43 between 15 and 45 feet bsg Hydrocarbon odor observations <br /> are noted in boring logs in Appendix B <br /> I <br /> Organic vapor (confirmed with the PID) was noted in the 20-foot soil sample duplicate collected <br /> from monitoring well MW-19 Organic vapor observations are noted in boring logs in Appendix B <br /> r <br /> 33 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> A total of seventeen soil samples were submitted to McCampbell Analytical, Inc and Cal Tech <br /> Environmental Laboratories,both DHS-certified laboratories for analysis ofpetroleum hydrocarbons <br /> TPH-d was detected from sample P41-30 at a concentration of 1 7 milligrams per kilogram(mg/kg), <br /> TPH-g and TPH-mo were not detected from laboratory analysis of selected soil samples <br /> Advanced GeoEnviron mental,Inc <br />