COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

Air Sparging Pilot Test Related Activities Report and Remedial Action Work Plan Former Countryside Market, Stockton, California April 30, 2015 6.0 REM EDIATION WORK PLAN The approved IRAP specified that AS and SVE should be considered for implementation and tested/evaluated before full-scale implementation. Based on pilot test results provided in Section 5.0 above, full-scale AS and SVE are considered feasible. AS/SVE is the best available remediation technology to meet Site clean up goals by injecting ambient air intended to aerobically treat petroleum hydrocarbons dissolved in groundwater and remove mass remaining in soil. The system will consist of a well network of ten AS wells and four SVE wells, (including existing AS-1, AS-2 and VW-1). The Site map showing proposed remediation features is included as Figure 5A. The proposed AS wells will be screened in the saturated zone, similar to both AS-1 and AS-2 (screened from approximately 110 to 115 feet bgs). A total of four SVE wells will be installed in the vadose zone, two screened similar to VW-1 (screened from approximately 30 to 60 feet bgs) and two screened 60 to 80 feet bgs. The exact screen intervals for the AS and SVE wells may be modified slightly based on lithology encountered in the field during well installation. The following scope of work is proposed for installation, startup, and operation of an in-situ AS/SVE treatment system: Acquire necessary permits from SJCEHD and San Joaquin Valley Air Pollution Control District (SJV-APCD); Install eight additional AS wells and three additional SVE wells at the Site (ten injection wells and four extraction wells total, including existing wells AS-1, AS-2 and VW-1); Install remediation equipment (i.e. air compressor, injection equipment, vacuum pump, treatment vessels, control panel, and flow control devices) in the proposed fenced compound; Install remediation piping (typically 1-inch schedule 80 PVC for AS and 2-inch schedule 40 PVC for SVE) to connect proposed and existing AS and SVE wells to the proposed remediation equipment compounds; Start injection equipment and instrumentation for in-situ AS/SVE system operations; Evaluate system performance and environmental data including air injection pressure and flow rates at the individual AS wells and vacuum rates and flow rates associated with SVE operation. In addition, DO and ORP will be monitored in existing groundwater monitoring wells and SVE influent and effluent VOC concentrations to calculate mass removal; and Present operational data and remedial progress summaries in remedial progress reports and provide recommendations. 6-1 The Source Group, Inc.