ARCHIVED REPORTS XR0009921 - Laserfiche WebLink

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Corrective Action Plan Page 7 extend from beneath the paving down to a depth of some 12 to 14 ft and penetrates into the deeper strata composed of loose sands Based on the results of analyses of soil samples and olfactory indicators noted on the boring logs, it appears that the total depth to which the soil has been contanunated in the vicinity of Well ULT 9 may have been locally influenced by excavations that were made to install the sanitary-sewer lateral that serves the property (Refer to Figure 6 for location ) In borings at distance from this area, the maximum depth at which the presence of components of gasoline was signaled by sample analyses or olfactory indicators was 14 ft or less REMEDIATION STRATEGY To develop a program for remediation of the subject property, the applicability of alternate remedial technologies was studied in the context of the site-specific geotechrucal, hydrogeologic, groundwater-quality, construction engineering, and site infrastructure and usage parameters and the interactions between them The principal constraints that control a remedial design for the site are the adverse subsurface conditions, the linuted zone within the plume of affected groundwater that is available for installation of remediation equipment and systems, and the regulatory limits on discharges to surface waters and to the air Strategic Design Considerations The following issues have strategic influence on the selection of a remediation technology and the design of a remediation system ❑ The preponderance of the contaminated soil in the subsurface is beneath the water table ❑ The soil strata beneath the water table include extensive formations of loose to very loose, highly permeable sands ❑ Two old, un-reinforced, brick structures (i a the RAS Car Wash budding at 124 East 11th Street and the Tracy Auto Parts building at 208 East 11th Street) are located within less than 60 ft of the site ❑ Gasoline contamination in groundwater has moved down gradient from the location where the underground storage tanks formerly on the site were situated, and has crossed the boundaries of the property along its frontages on East 11 th and "F" Streets (See Figure 6 for locations )