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' Report—Fist Phase Remedial S stem Page I i Y Former Manna Pro Site ' Project No 207 3 June 18,2002 ' 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 The most important units as related to the installation of the sparge well ASW-2 as well as previously ' constructed wells ASW-1 and VEW-1 are the lower and upper sand units The lower clay unit appears to be the boundary of most of the contamination For more detail see the boring log in Appendix B , and the cross-section attached as Figure 6 4.2 Air Sample Collection ' Air samples from the vapor extraction system were collected for laboratory analysis at the beginning and end of the operation, and two intervening times during the operation In addition samples were collected of PID measurement on a weekly basis The samples ' were collected in Tedlar bags 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 collected PID/OVM readings were made from the air contained in separate Ibags from those intended for laboratory analysis Tedlar bags containing samples intended for laboratory analysis 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 Iaboratory, thereby providing a means to track their movement and insure their integrity tUnfortunately, the final air sample collected from up-stream of the carbon filters was lost due to a hole in the Tedlar bag This loss was not deemed a material impairment in ' evaluating the results of the VES operation 4.3 Soil Sample Analysis Three elected soil samples from ASW-2 were shipped to Sherwood Labs of Hilmar CA • Total Petroleum Hydrocarbons as Gasoline (TPH-Gasoline) by EPA method 8015m, • Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX) by abbreviated EPA 8020,and The detection limits for those compounds are as follows I Compound TPH-G TEPH-D Benzene Toluene Eth 1 Benzene X Iene Detection Limit 10 50 30 3 0 30 30 Units mg/kg mg/kg lag/kg µg/kg pg/kg Fig/kg The laboratory data sheets showing the analytical results are attached in Appendix A-I I2937 Veneman Ave, #B240 Geo-Phase Environmental Inc Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295 I