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' Report—Fist Phase Remedial System Page 13 <br /> Former Manna Pro Site <br />' Project No 207 3 <br /> • dune 18, 2002 <br />' 5.0 SAMPLE ANALYTICAL RESULTS <br />' The following sub-sections describe the sample analytical results <br /> 5.1 Soil Sample Analytical Results <br />' The soil analytical results from ASW-2 are summarized in Summary Table i In general, <br /> detectable concentrations of gasoline range petroleum hydrocarbons and/or BTEX <br />' compounds are present from the approximate levels of first groundwater (about 35 feet <br /> bgs) and extending downward to the total depth at 55 feet The maximum concentrations <br /> occur near the 40 to 45 foot level Three soil samples were selected for analytic testing <br />' These samples were from the 35, 45, and 55-foot levels TPH-G concentrations were 1 <br /> ppm, 5 ppm, and ND respectively Benzene concentrations were non-detectable, 515 <br /> ppb, and 11 ppb respectively <br />' The soil analytical data as shown in Summary Table I as well as in earlier soil sampling <br /> suggests that gasoline impacted soil extends from near the groundwater surface at (25 to <br />' 30 feet bgs) to depths of more than 50 feet bgs, but the bulk of the contaminant mass lies <br /> between about 35 and 45 feet A more detailed discussion of the soil stratigraphy may be <br /> found in the earlier Feasibility Study Report <br /> Table I <br /> Soil Analytical Data <br /> Boring N Depth Sample Gasoline Benzene Toluene Ethyl Xylene <br /> Benzene <br />' Source feet Date m b b pb b <br /> ASW 2 35 5-36 0 07/31/01 1 ND<3 8 ND<3 4 <br /> 45 5-46 0 07/31/01 5 515 19 31 55 <br /> 55 5 56 0 07/31/01 ND 11 ND<3 ND<3 ND<3 <br /> NA=Not Applicable <br /> ND=Not Detected <br /> 5.2 Air Sample Analytical Results <br /> During the course of vapor extraction, one sample of raw, extracted vapor and one sample <br /> of effluent gas were collected on four occasions These samples were collected to assess <br /> the effectiveness if the vapor extraction remedial process and the efficiency of the carbon <br /> units in preventing fugitive hydrocarbon emissions to the atmosphere As shown in <br /> Summary Table 2, the first sample was collected shortly after the VES was started to <br /> provide baseline data on the gasoline vapor content Subsequent samples were collected <br /> 2937 Veneman Ave, #B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209) 569-0295 <br />