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Revised LFR Levine-Fricke to select the optimum vacuum to be used in the constant rate test for each well Step tests will be conducted on one of the My screened extraction wells (FSEW-3) and all three partially screened wells in partially screened extraction well cluster PSEW-4, 5, and 5- Vacuum responses will be measured in all other monitoring wells The step test will begun with a vacuum of approximately 20 inches of water column ("m-DxO") apple at the extraction well If no response is observed in any adjacent monitoring well, the vacuum will be stepped tip in regular increases until a response is observed in a monitoring well. A response is defined as I percent of the extraction pressure, or a mmimuin of 0.05 in H2O vacuum Each subsequent step will be taken only when monitoring well responses remain stable for two sequential readings obtained five minutes apart. The step sequence will be continued until the operational capacity of the blower is maxiinized As presented in Table 1, field VOC monitoring (using Tedlar bags and a handheld photomnization detector JPID] or organic vapor analyzer)will be conducted frequently during the early portion of each step in the vacuum step tests_ This is clone to establish an adequate data set of VOC removal rates cinder rapidly changing SVE conditions Laboratory samples will be collected at the end of each step (one per step) to correlate with PID readings Vacuum responses will also be recorded at each monitoring well more frequently at the beginning of each step, and then at a logarithmically decreasing rate over urne because the rate of vacuum response typically decreases with tilde at a corresponding rate 5.3.3 Constant Rate Test A,constant rate test will be performed once the step test is completed and an optimum flowivacuum combination is determined Constant rate tests will be conducted on FSEW-3 and PSEW-4, 5, and 6 Vacuum responses will be measured in other monitoring wells. The goals of the constant rate tests are as follows • Collect pressure and concentration data for the design sizing of blowers and treatment components for the longer duration Phase II pilot test • detemune flow rates and pressure response differences (if any) between the filly screened extraction and the partially screened extraction wells • determine the Icing-terin equilibrium pressure distribution and estimate the are-iof influence for each extraction well • collect adequate data to allow calculation of average air permeability and resultant air flow. or pore volume flushes required to effectively remediate VOC-affected soil • monitor the changes in VOC concentrations over tune, to develop an understanding of the maximum mass removal rates for design of long-tenni treatment options wp"WEC&-�L'Wi-nv-081x3 d%Ifs Page is Obi£T d S£TOP91760ZT 01 906P ZS9 OTS 3NO1 ;J �NIOTI MAI dd 82 9T Z0, 68 inr