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Report-Pilot Remedial Svstem Test Page 17 Former Manna Pro Site Project No 207 3 July 31, 2000 40+feet to 50+ feet Silty sand and sandy silt, dark greenish gray to dark gray Poor to fair sorting ' This characterization of the stratigraphy at the site is a generalized composite from all of the boring logs The most important units as relate to the installation of air sparge and vapor extraction wells are the lower and upper sand units The lower clay unit appears to be the boundary of most of the contamination When completing the cross-section it was noted that most of the lithologic descriptions from MW-6 did not coincide well with the other soil borings This may be due to the fact that much of the soil from the boring was logged based upon auger cuttings with no discreet sampling intervals For more detail see the boring logs in Appendix B and the cross-section attached as Figure 7 5.2 Air Sample Collection ' Air samples were collected at various times during the pilot test Samples were collected in a Tedlar bag attached to Tygon tubing which was, in-turn, attached to a sampling port on the VES system The bag was then attached to a hand stroked air pump and a sample 1 collected An OVM reading was made from the air contained in the bag, the Tygon tube discarded, and the bag placed in a cool environment for immediate transport to the analytical laboratory A chain of custody document, listing all samples collected and their intended analyses, accompanied the samples from field to the laboratory, thereby providing a means to track their movement and insure their integrity ' 5.3 Soil Sample Analysis ' Selected soil samples were shipped to Sherwood Labs of Hilmar CA, a state certified analytical laboratory (DHS# 1400) under chain of custody protocol for analysis Note that not all soil samples collected were submitted for laboratory analysis The selected soil samples from each boring were submitted for analysis as follows • Total Petroleum Hydrocarbons as Gasoline (TPH-Gasoline) by EPA method 8015m, • Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX) by abbreviated EPA 8020, and • TEPH as Diesel by EPA method 3540/8015m The detection limits for those compounds are as follows ' Compound TPH-G TEPH-D Benzene Toluene Ethyl Benzene Xylene Detection Lima 10 _50 30 30 30 30 Units I mg/kg mg/kg µg/kg uglkg pLgft pg/kg MThe soil laboratory data sheets showing the analytical results are attached in Appendix A- 1 ' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone(209)569-0293 Modesto,CA 95356 Fax(209) 569-0295