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I <br /> Feasibility Study/Corrective Action Plan 9 <br /> The Drake Property 26485 Thornton Road Thornton California November 26 1996 <br /> benzene, toluene and TPH-G (negligible levels of ethylbenzene and total xylenes were <br /> detected in one boring) <br /> ■ Impact to groundwater has been mitigated through removal of source soils impacted with <br /> negligible concentrations of BTEX and TPH-G <br /> ■ Benzene concentrations in groundwater are non-detect (the near MDL August 22, 1994 result <br /> is a likely sampling or laboratory error) <br /> ■ A comparison of site conditions with RBSLs shows that hydrocarbons in groundwater on site do <br /> not pose a threat to human or environmental health <br /> ■ The additional economic cost of conducting further environmental assessment and <br /> remediation activities at the site is not warranted because site conditions meet"low-risk" criteria <br /> qualifying the site for"No Further Action" status <br /> Fluor Daniel GTI makes the following recommendations <br /> ■ Apply "No Further Action" status to the site in order to cease environmental cleanup activities <br /> and related expenditures <br /> ■ Sample and analyze the existing soil stockpiles on site for possible use as backfill of the <br /> excavated areas If samples test positive for hydrocarbons, aerate soils on site until <br /> hydrocarbon concentrations drop below MDLs, then use the aerated soils as excavation <br /> backfill <br /> +* Properly Destroy all environmental wells on site <br /> 70 REFERENCES <br /> American Society for Testing and Materials (ASTM E 1739-95) 1995 Standard Guide for Risk-Based <br /> Corrective Action Applied at Petroleum Release Sites, ES 38-94 ASTM Philadelphia, PA <br /> California Regional Water Quality Control Board, Central Valley Region (CRWQCB-CVR), 1996 Revised <br /> Draft Recommendations for Low Risk Site Classification in the Central Valley Region July 19, 1996 <br /> California Regional Water Quality Control Board, Central Valley, North Coast and San Francisco Bay <br /> Regions (CRWQCB-CVR, NC, SFB) 1991 Tri-Regional Board Staff Recommendations for <br /> Preliminary Evaluation and Investigation of Underground Tank Sites August 30, 1991 <br /> California State Water Resources Control Board (CSWRCB), 1995 Letter dated December 8, 1995 from <br /> Walt Pettit, Re Lawrence Livermore National Laboratory(LLNL) Report on Leaking Underground <br /> Storage Tank (UST) Cleanup <br /> Groundwater Technology, Inc , 1995 Report of Secondary Investigaton, 26485 Thornton Road, Thornton, <br />. California Report dated May 4, 1995 <br /> 0191 FEA A PT(Mist 15) <br /> FLUOR DANIEL GTI <br />