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19 <br />6. Increase the vacuum on the well by 10 in. H2O and repeat steps <br />5 and 6 until the vacuum on the well reaches the maximum <br />vacuum calculated to be applied to the well as evaluated by <br />the site engineer. The maximum amount of vacuum to be applied <br />to the well is to be less than the total amount of screen <br />available in the vadose zone so the groundwater in the well <br />casing does not submerge the entire well screen. <br />' The step test data will be recorded as the test is being <br />conducted on the form provided in Appendix B. The flow and vacuum <br />data will be plotted in an X -Y graph on a field computer as the <br />' test proceeds. The transition from laminar to turbulent vapor flow <br />in the well will be indicated by a decrease in the slope of the <br />' graph. Based on the results of the step vacuum test, a decision <br />will be made by the site engineer as to the vacuum and flow rate to <br />maintain during the vent test. <br />6.2 Vent Test <br />The vent test will be performed after the step vacuum test is <br />completed and the initial conditions are measured and recorded, the <br />' soil venting test will begin. <br />Data collected during the vent test will include water levels <br />' and pressure readings at wells PZ -1, PZ -2, MW -2, MW -4, MW -5, MW -7, <br />MW -10 and flow rate and pressure readings at the vent blower. <br />Vapor samples, humidity, and temperature measurements will be <br />collected from the blower at the time intervals specified in Table <br />1. Vapor samples will also be analyzed on site by the use of a <br />' flame ionization detector (FID). <br />The duration of the vent test may be longer or shorter than <br />anticipated based on data collected during the test. <br />The radius of influence created by the venting system will be <br />' evaluated from pressure changes observed at the piezometers and <br />monitoring wells. If a pressure less than the baseline pressure <br />(vacuum) is measured at a monitoring well, then that well will be <br />assessed to be within the radius of influence of the vent well. <br />07/94/1213821125997/REM REP/1 July 1, 1994 9 26am <br />