ARCHIVED REPORTS XR0001782 - Laserfiche WebLink

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LFR Levine Fricke Revised SThe investigation assessment data will be used to evaluate the applicability, effectiveness, and cost that would be expected for the design of a full-scale groundwater air sparging system for the shallow zone groundwater beneath the Property 7.2 SVEIGAS Pilot Test Overview Air sparging has proven to be effective in volatilizing a wide variety of organic chemicals, including chlorinated VOCs Air sparging will volatilize VOCs into the vapor phase and the resultant vapors will be later captured by the SVE system (which will continue to operate at all times during the GAS pilot test LFR proposes to use a self-contained air (or ozone) sparging system equipped with a I IOV panel During the Phase III test, only the air sparging component of the C-Sparge system will be used However, during the SVE/GOS pilot test to be performed at a later date (Phase IV), the ozone generator within the sparge system will be put into use and ozone will be sparged into the shallow-zone groundwater_ A description of the SVE/GOS pilot test phase is presented in Section 8 The self contained 110V sparge system panel operates as follows. Compressed air is sparged through tubaiig to the sparge pout that is designed to generate very small bubbles, i e , approximately 50 micrometers in diameter Micro bubbles are forced out into the surrounding water-bearing formation.The control panel regulates the frequency/duration of air sparging and on/off sequencing Compressed air sparged into the formation comes into contact with affected groundwater, where contaminants in groundwater volatilize into the air bubble and are carried to the vadose zone where it is captured by the SVE system This technology has the following advantages over other remedial approaches because of the. low capital equipment costs imrn nal site disturbance • self-contained and compact equipment (2-feet by 3-feet) ■ potential to substantially decrease the mass and concentration of contaminants in a short time period The primary tool for developing design requirements for a GAS system will be the pilot testmg program described in the following sections. The GAS pilot testing program is proposed at the locations depicted in Figure 10 The well locations in which air sparging will be conducted are described in Section 6 3 Implementation of the pilot testing program will last until PCE concentrations in groundwater are approximately 1,000 µg/l or less so as not to cause potential degradation of the groundwater during ozone sparging This will be followed by post-test groundwater momtoring for one Wp-SVF.GSLOdwf[v-08123 doe Ur 0triL0 d BET 009060E T 01 9060 E59 0 T S 3>0 I 6J 9N I A31 adI N3 60 9T Z0. 60 inr