FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Soil Boring Results and VEG//SC:O Work Plan Field Maintenance Shop#24, Stockton, California August 2016 Order is not more restrictive to the projects covered under Order No. R5-2008-0149 and thus it is not necessary to enroll them under this Order."Since the scope of this work plan is a continuation of ISCO injections and in-situ thermal treatment of vadose zone soils utilizing only steam (VEG) as described below, the CA ARNG is seeking to perform the proposed work under the existing General Order No. R5-2008-0149-045. Additional permitting requirements for the project include VEG injection/recovery wells and ISCO injection point permits and an air quality permitting/exemption for VEG implementation. All applicable VEG and ISCO boring permits will be obtained from the San Joaquin County Environmental Health Department(SJCEHD) prior to conducting any drilling activities. In addition, applicable air quality permits or exemptions will be obtained from the San Joaquin Valley Air Pollution Control District (Valley Air District) prior to the field implementation of the work plan. 3.2. Vapor Energy Generator Technology Vapor Energy Generator (VEG) Soil Remediation technology, developed by Endpoint, Inc. is a soil thermal treatment process that uses high temperature steam with patented emission-reducing filters to treat contaminated soils. VEG technology can be performed both ex-situ and in-situ.The ex-situ component of the VEG technology utilizes a mobile,fully enclosed soil remediation system capable of thermally treating petroleum hydrocarbons, chlorinated solvents, munitions constituents, pesticides, PCBs, PFCs,and select metals(including arsenic, mercury,zinc)in soils. The ex-situ component of the VEG technology has been used successfully to consistently treat a full range of organic compounds(including petroleum hydrocarbons present at the Site)and select metals to non-detect levels(i.e., 99.99% reduction) in soils within a few minutes of treatment time, corresponding to typical treatment rates of 300 cubic yards per day. The ex-site option requires excavation of soils for onsite treatment, followed by backfilling of the excavation with the treated soils,with no restrictions on land use. Due to the depth of soil impacts, utility conflicts and impacts to CA ARNG facility operations implementation of ex-situ VEG was not considered reasonable at the Site. The in-situ component of the VEG technology relies on the highly efficient vapor generator to change the physical properties of soil contaminants, NAPLs, crude oil,and fuels in the subsurface, allowing for subsequent recovery/recycling. Recovered vapors in the head space are sent through patented filters for capture and/or treatment of mono-nitrogen oxides (NOx), sulfur oxides (Sox), hydrogen chloride (HCI), and carbon dioxide (CO2) components, with the remaining vapors subsequently sent back to the vapor generator to replace the propane as the fuel to operate the VEG system. The patented filters ensure negligible air emissions, thereby easing air quality permitting process. The in-situ component of the VEG technology has been used to achieve chemical concentration reductions ranging from 85%to 99.99% (with typical reductions on the order of 90%). In-situ VEG requires heating of the subsurface for periods on the order of 2 to 3 weeks, and extraction of induced vapors for at least a one-week period. Therefore, treatment durations using the in-situ options are greater than those for ex-situ treatment, but the former eliminates the need for excavation of deep soils and has been selected by the CA ARNG for treatment of residual hydrocarbons present at depths of 15 to 35 feet bgs beneath the VEG treatment area in the vicinity of FMS-MW6 (Figure 6). 3.2.1. VEG Implementation Objectives Based on the recent and historical soil analytical data discussed in Section 2.0 above, the CA ARNG and its contractor is proposing to perform in-situ thermal treatment of vadose zone soils Page 6