Laserfiche WebLink
' Report—Vapor Extraction/Air Sparge Remedial System Page 7 <br /> Former Manna Pro Site <br />' Project No 207 3 <br /> • September 26, 2003 <br /> 40+feet to 50+ feet <br /> Silty sand and sandy silt, dark greenish gray to dark gray Poor to fair sorting <br />' This characterization of the stratigraphy at the site is a generalized composite from all of <br /> the boring logs The most important units as relate to the installation of air sparge and <br /> vapor extraction wells are the lower and upper sand units The lower clay unit appears to <br /> be the boundary of most of the contamination For more detail see the boring logs in <br /> Appendix B <br /> 3.2 Soil Sample Analysis <br /> At least two selected soil samples from each boring were shipped to Sherwood Labs of <br />' Hilmar CA and tested as follows <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-Gasoline) by EPA method 8015m, <br />' • Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX) by abbreviated EPA <br /> 8020, and <br />' The detection limits for those compounds are as follows <br /> Compound TPH-G Benzene Toluene Ethyl Benzene X lene <br />' Detection Limit 1 0 30 3 0 3 0 30 <br /> Units I mg/kg pg/kg pg/kg pg/kg µg/kg <br />' The laboratory data sheets showing the analytical results are attached in Appendix A <br />' 3.3 Soil Sample Analytical Results <br /> The soil analytical results are summarized in Summary Table 1 In general, elevated <br /> concentrations of gasoline range petroleum hydrocarbons and BTEX compound are <br />' present from the approximate level of first groundwater (about 30 feet bgs) and extending <br /> downward to about 50 feet Below 50 feet the concentrations decrease as evidenced by <br />' the fact that only two sample from 50 feet exceeded 100 ppm of TPH-G <br /> I <br />' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />