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AC <br /> approximately 10 feet based on subsurface compound distribution and known <br /> concentrations Area D is capped by an asphalt surface to prevent downward migrating <br /> ground water from moving compounds vertically to the ground water site No further <br /> assessment of this area is warranted <br /> WZI Inc recommends the following <br /> (1) LCN prepare a Health Risk Assessment to determine what levels San <br /> Joaquin County Local Health District will view as hazardous for hydrocarbon <br /> impacted soil This will help determine what method, if any, can be <br /> proposed to leave hydrocarbon impacted soil in place provided it is <br /> covered with an impermeable layer <br /> (2) LCN prepare a Proposed Remedial Action Plan to be submitted to San <br /> Joaquin County Local Health District to conduct the following items <br /> (A) Excavate hydrocarbon contaminated soil around the concrete tank <br /> • where possible Soil will be remediated at the surface <br /> (B) Clean and abandon the concrete tank and all piping The tank <br /> should be backfilled with appropriate material that meets San <br /> Joaquin County specifications <br /> (C) Place an impermeable cap over the tank area to prevent downward <br /> migrating ground water from impacting local ground water <br /> (3) Arrange for a meeting with DTSC personnel to determine what status the <br /> LCN site will have regarding any further site assessment requirements <br /> regarding chlorinated hydrocarbons in the subsurface <br /> 12-270010 013 Page 26 <br />