Laserfiche WebLink
25 April 2000 <br /> AGE-NC Project No. 98-0520 <br /> ' Page 4 of 7 <br /> and <br /> • Oxygenated fuel additives including MTBE,TBA,DIPE,ETBE,and TAME,with 1,2-DCA <br /> in accordance with EPA Method 8260B. <br /> 1 <br /> 3.7. SURVEYING <br /> On 05 January 2000, the casing elevations of wells MW-1,MW-2,MW-3,MW-4 and MW-5 were <br /> ' surveyed to the nearest 0.01-foot relative to..City of Manteca Bench Mark Datum BM#63 by <br /> representatives of Baumbach and Piazza,Inc.of Lodi,California,licensed surveyors(Appendix B). <br /> 4.0. FINDINGS <br /> ' Soil descriptions, ground water elevation, and flow direction were calculated from field data; <br /> hydrocarbon-impacted soil and ground water was inferred from laboratory analysis of sail and <br /> • ground water samples. <br /> 4.1. STRATIGRAPHY <br /> Generally,a brown,moist,poorly graded fine to medium sand were encountered from surface grade <br /> to depths as great as approximately 15 feet bsg. A brown to olive-gray/green, wet, sandy silt/fine <br /> ' sand was encountered at approximately 20 feet bsg,25 feet bsg,and at 35 feet bsg.A green to olive- <br /> gray,wet,silty clay was generally encountered at approximately 30 feet bsg.Boring logs are included <br /> ' in Appendix A. <br /> ' 4.2.. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The relative elevation of ground water in each well was calculated by subtracting the depth to ground <br /> ' water from the surveyed relative casing elevations (Table 1). Depths to ground water ranged from <br /> 17.62 feet to 18.35 feet below the tops of the well casings. Ground water elevations at the site ranged <br /> from 18.66 feet in MW-5 to 18.73 in MW-4 relative to mean sea level. The ground water gradient <br /> ' across the site was variable and the ground water flow direction was indeterminate due to the low <br /> gradient on the site. <br /> ' Advanced GeoEnvironmental,Inc. <br />