FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

• 0 MIP Investigation and ISCO Injection Project California Army National Guard FMS #24 Stockton, CA Environmental Cost Management, Inc. (ECM) is performing work on behalf of the California Army National Guard (CA ARNG), under Contract W912P7-12-D-0001, Task Order CQ01, with the U.S. Army Corps of Engineers (USACE) Los Angeles District. The work includes the implementation of a membrane interface probe (MIP) investigation, soil boring installation and sampling, and aquifer testing to support design and implementation of an in-situ chemical oxidation (ISCO) treatment plan to remediate impacts from former underground storage tanks (USTs) at the CA ARNG Field Maintenance Shop (FMS) #24 in Stockton, California. See attached boring plan. The objectives of this project are to: • Delineate the horizontal and vertical impacts to soil and groundwater, using up to 15 MIP borings, along the southern and eastern boundaries of the source area where the extent of impacts associated with the former USTs has not been fully defined; • Identify two locations at which to advance soil borings to further characterize subsurface conditions within impacted areas along the southern and eastern boundaries of the source area based on MIP study results; • Advance two soil borings to approximately 50 feet below ground surface (bgs) and perform soil sampling to assess ISCO treatment requirements; and • Assess the horizontal and vertical distribution of contaminants in the source area and contaminant plumes as determined through site assessment and monitoring activities. To achieve the stated project objectives, the following scope of work has been developed: Complete up to 15 MIP borings, to depths of 50 feet bgs, along the eastern and southern portions of the source area to delineate petroleum hydrocarbon impacts to soil and groundwater (see attached boring plan); Analyze the MIP data to characterize the contaminate plume extent and stratigraphy of the area and determine the location of two soil borings; Advance and sample two (2) borings (see boring plan) to collect additional soil samples (one from each boring) for assessing soil oxidant demand, biochemical oxygen demand, chemical oxygen demand, and to further assess the distribution and concentration of site contaminants (total petroleum hydrocarbons as diesel [TPH-d]; total petroleum hydrocarbons as gasoline [TPH-g]; benzene, toluene, ethylbenzene, and total xylenes [BTEX]; and volatile organic compounds [VOCs], including naphthalene and fuel oxygenates). Evaluate soil lithology, soil/groundwater chemistry, and vertical and horizontal extent of impacts to soil and groundwater based on site assessment and monitoring data. This information will be used to support future ISCO design and application in a Remedial Action Work Plan (RAWP) All MIP and soil boring locations will be advanced via direct push methods and abandoned per SJEHD regulations on the same day they are advanced. Proposed boring locations are shown in the attached boring plan. Page 1 of 1