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STATE OF CxAUFORNIA GEORGE DEUKMEXAN,Govemw <br /> CALIFORNIA REGIONAL WATE UALITY CONTROL BOARD qR <br /> — <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 30 March 1988 <br /> 1R E1dT L tiEALTH <br /> VEIRMIT/sERVICE5 <br /> Mr. Gary W. Keyes <br /> Crowley Environmental Services <br /> 321 Embarcadero <br /> Oakland, CA 94606 <br /> DISPOSAL OF CONTAMINATED SOIL AT FORWARD LANDFILL, SAN JOAQUIN COUNTY. (CASE <br /> #2209) <br /> I have reviewed the information you telecopied to me on 28 March 1988. I <br /> understand that you propose to send approximately 200 cubic yards of soil <br /> containing an average total petroleum hydrocarbon (TPN) concentration of 386 <br /> ppm. The primary constituents are hexane and pentane. This material can be <br /> aerated at Forward Landfill and can be disposed of once the TPH drops below 100 <br /> ppm. My only concern is the absence of a metals analysis. I don't expect to <br /> see high levels of metals in the soil , but in view of the unusual nature of the <br /> tanks (several small underground tanks whose origin in unknown, but appear to <br /> have contained hexane and pentane) , I want to see a metals analysis before <br /> deciding on the ultimate method of disposal of the soil at Forward. If the <br /> metals are low, the soil can be used as daily or intermediate cover. An <br /> elevated metals content would limit disposal options to use in the foundation <br /> layer of the final cap for WMU A. If metal cd,ncentrations exceed hazardous <br /> levels, the soil will have to be removed from the site. <br /> If you have any questions, contact me a (916) 361-5737. <br /> TIMOTHY CRANDALL <br /> Project Engineer <br /> TAC:sg <br /> cc: San Joaquin County Local Health District, Stockton <br /> Ms. Carolyn Richardson, California Farm Bureau Federation, Sacramento <br /> Mr. Greg Basso, Forward Inc. , Stockton <br />