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-45 East Harding Case Closure Summary Pag, - <br /> Ill Release and Site Characterization�ormation (oneaking tinued)round Fuel Storage Tank ProgiJ <br /> Material Amount Units <br /> I ( ) Action(Treatment or Disposal w/Destination) <br /> Tank#1,2,3 10,000 gallon each Date:( <br /> Tank#4 550 i <br /> Disposed at Erickson 255 Parr Blvd, Richmond CA <br /> Tank#5 550 12/7/88 <br /> Disposed at Erickson 255 Parr Blvd,Richmond CA l <br /> Tank#6 3/21/94 <br /> 4,000 gallon Disposed at Erickson 255 Parr Blvd, Richmond CA .l <br /> Tank#7 12/7/88 <br /> 3,000 gallon <br /> Piping unknown Disposed at Erickson 255 Parr Blvd, Richmond CA � <br /> 12/7/88 <br /> II <br /> Free Product unknown <br /> Soil unknown volume aerated on site for onsite disposal <br /> 4/9/97�.{. <br /> Groundwater unknown volume Chevron Refinery, Richmond CA 4/9/97')i <br /> Barrels none <br /> I <br /> I <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup I <br /> l� <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before <br /> After Before3 After4 (ppm) Water {• (ppm) <br /> After I Before After <br /> TPH(Gas) 16,0001 10,0002 61.0 10.250 1 Ethylbenzene 5901 102 4.111, 10.0015 <br /> TPH (Diesel) NA NA Xylene 2,8001 1802 16.0 0.0027 <br /> Benzene 1601 <2.52 10.0 0.0012 <br /> Toluene 1,8001 <2.52 42.0 0.0051 MTBES NA .200 ppm <br /> Comments: Soil Sample collected at 26.5' during the installation of V3 on 1/24/89. 2. Soil Sample collected at 25' during the drilling of <br /> SB13 on 6/1/95. 3• Water Before-sample-MW4 on 4/13/89. 4•Water After-sample-MW4 on 10/24/96. S-Methyl-tert-butyl-ether(MTBE)- <br /> sample-MW9 on 10/24/96 confirmed. Soil Vapor extraction operated at the site from 11/90 to 11/92. An estimated amount of TPH of 12,000 <br /> lbs (1,967 gallons)were removed. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes. Site management requirements: <br /> None. I <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan?Yes. <br /> Does corrective action protect public health for current land use? Yes. Should corrective action be reviewed if land use changeI,s?Yes. <br /> MonitoringNapor wells decommissioned: Some Number Decommissioned: 14 Number retained:0 <br /> List enforcement actions taken: NOR(s)sent: 10/6/89& 1/14/91 (Chevron); 1/3/91 & 1/14/91 (R.Bleweft); <br /> 8/25/93(C.Lawrance for Blewett); 3/8/95 (Manchester Club). <br /> List enforcement actions rescinded: Compliance problems observed with issued regulatory directives. <br /> V. Local Agency Representative Data - <br /> Name: Donna Heron Title: Director of Environmental Health <br /> Signature: 5 ne Date: qI�P-3 1 c <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification )' <br /> Date Submitted to RB: Response Date: <br /> RB Staff:J. Brathovde Response: <br /> Title:Assoc Eng Geologist -J <br /> VII. Additional Comments, Data, etc. •I• <br /> Ross Tinline, California Registered Geologist#5860, stated in the Pacific Environmental Group's November 1R, 1996"Revised;Request for <br /> Site Closure"that the remaining 4,000 pounds of petroleum hydrocarbons will provide"little potential for future impact to groundwater"with no <br /> discussion of leaching potential. Ross Tinline, stated in the"Revised Request for Site Closure"dated 2/14/97 that the potential for any human <br /> health or environmental risk is negligible and the remaining petroleum hydrocarbons are not likely to have any adverse impact on water <br /> quality. •'1 <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official site file. <br />