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Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 <br /> Manna Pro, 4004 South EI Dorado, Stockton, CA 2 <br /> 1 2 Scope of Work <br /> ' The scope of work performed and discussed in this report is summarized below <br /> ' Installation of one extraction well and three observation wells, <br /> • Performance of a constant-rate aquifer test (groundwater extraction only), <br /> ' Performance of a combined groundwater extraction and high-vacuum soil vapor <br /> extraction (HVE) test, <br /> ' - Performance of a high-vacuum dual-phase extraction (HVDPE) test, <br /> Review of existing soil and groundwater analytical data and preparation of updated <br /> ' isoconcentration maps and hydrocarbon mass estimates, and <br /> • Preparation of a conceptual remedial system design <br /> ' 2.0 SITE BACKGROUND <br /> The Manna Pro facility is located at 4004 South EI Dorado Street, Stockton, San Joaquin County, <br /> California A regional location map of the site is provided as Figure 1 The facility consists of a feed <br /> ' mill and warehouse that is currently not in operation Environmental investigations have been <br /> ongoing at the facility since approximately January 1990 This section presents a summary of <br /> ' previous soil and groundwater investigations and a discussion of recent well installations <br /> ' 21 Summary of Previous Investigations <br /> ' The results of previous investigations are summarized to provide the basis for characterizing the <br /> distribution of hydrocarbons at the site <br /> ' 21 1 Preliminary Site Assessment, WHF, Environmental Consultants, Inc <br /> During January 1990, WHF, Environmental'Consultants, Inc (WHF) conducted a site assessment <br /> ' that included the installation of six soil borings near five underground storage tanks (USTs) located <br /> north of the main entrance gate of the facility -The former USTs were located within the area <br /> bounded by monitoring wells MW-1, MW-3 and MW-4 (Figure 2) The tanks included two <br /> 2819R034 070 <br /> 1 <br /> GROUNDWATER <br /> ' TECHNOLOGY, INC <br />