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' 06 December 2000 <br /> AGE-NC Project No 95-0173 <br />' Page 5 of 7 <br />' 33 RESULTS OF VAPOR EXTRACTION <br /> Between 01 July 2000 and 04 October 2000,the SVE and IAS remediation systems were operational <br /> for 2,090 hours (Table 4) During the operational period, SVE Inlet flow rates ranged from 105 to <br /> 120 sef n, differential pressures between 3 9 and 4 3 Inches of water, and induced vacuum between <br /> 6 and IS inches of water Utilizing a phototomzation meter(PID), hydrocarbon concentrations were <br />' measured between 29 and 65 parts per million (ppm) at regular Intervals at the SVE inlet, however <br /> a general concentration trend was not established from the PID field measurements Field <br /> measurements are summarized in Table 4 <br /> 3 4 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br />' Soil-gas vapor samples were collected on 13 July 2000, 25 July, 07 September and on 04 October <br /> 2000 TPH-g was detected in soil-gas vapor samples collected from the SVE Inlet at concentrations <br /> as high as 1,600 µg11 and from the SVE outlet at concentrations as high as 92 4g/1 <br /> BTEX compounds were detected in soil-gas vapor samples collected from the SVE inlet at <br />' . concentrations as high as 110 ug/l (xylenes) Benzene concentrations were detected as high as 1 3 <br /> pg/l BTEX compounds were detected In soil-gas vapor samples collected from the SVE outlet at <br /> concentrations as high as 7 1 jtg/l (xylenes) Analytical results of soil-gas vapor samples are <br /> summarized In Table 3 The laboratory reports (McCampbell Analytical Laboratory I D 's 43063, <br /> 43715, 43716, 47027, 47028, 49724 and 49725) and chain-of-custody forms are presented in <br /> Appendix D <br /> 3 5 MASS CALCULATION OF RECOVERED PRODUCT <br /> The hydrocarbon mass removed during the SVE operating period was calculated using the following <br />' equation M= C•Q•t <br /> where M = cumulative mass recovered (kg) <br /> C = vapor concentration (kg/m') <br /> Q = extraction flow rate (M3/hr) <br /> t = operational period, in hours <br /> IBetween 01 July 2000 and 04 October 2000,the extraction unit operated a total of 2,090 hours The <br /> average analytical results (approximately 1,450 ,ug/l) of the vapor samples, average flow rates <br /> (approximately 115 cfin) and the operational period were used to calculate the approximate mass of <br /> • <br />' Advanced GeoEnvironmental,Inc <br />