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�] <br /> at Harding Closure Summary Pa 'r <br /> &esking Underground Fuel Storage Tank Prog <br /> III Release and Site Characterization Information (continued) <br /> Material Amount(Units) Action(Treatment or Disposal w/Destination) Date <br /> f <br /> Tank#1,2,3 10,000 gallon each <br /> J <br /> - Tank#4 550 Disposed at Erickson 255 Parr Blvd, Richmond CA 12/7/88 <br /> ii <br /> Tank#5 550 Disposed at Erickson 255 Parr Blvd, Richmond CA 3/21/94 <br /> i; <br /> Tank#6 4,000 gallon Disposed at Erickson 255 Parr Blvd, Richmond CA 12/7/88 <br /> Tank#7 3,000 gallon Disposed at Erickson 255 Part Blvd, Richmond CA 1217/88 <br /> Piping unknown <br /> Free Product unknown <br /> i <br /> Soil unknown volume aerated on site for onsite disposal 4/9/97 <br /> Groundwater unknown volume Chevron Refinery, Richmond CA 4/9/97 <br /> Barrels none <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil Before (ppm) Water I (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> ! After Before3 After4 After Before After <br /> ' TPH (Gas) 16,000 1 0,000Z 61.0 1 0.250 Ethylbenzene 590T 102 4.1 0.0015 <br /> ' TPH (Diesel) NA NA Xylene 2,8001 1802 16.0 0.0027 <br /> i Benzene 1601 <2.52 10.0 0.0012 <br /> j Toluene 1,8001 <2.52 42.0 0.0051 MTSE5 NA .200 ppm <br /> Comments: • Soil Sample collected at 26.5'during the installation of V3 on 1/24/89. • Soil Sample collected at 25'during the drilling of <br /> SB 13 on 6/1/95. 3. Water Before-sample-MW4 on 4/13/89. 4•Water After-sample-MW4 on 10/24/96. 5-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 /> Ins (1,967 gallons)were removed. i <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes. Site management requirements: <br /> None. ii <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 changes?Yes. <br /> Monitoring/Vapor 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.Blewett); <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 i1 <br /> Name: Donna Heran Title: Director of Environmental Health <br /> ! Signature: w a Date: z <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to R& Response Date: <br /> RB Staff:J.Brathovde .; Response: <br /> Title:Assoc Eng Geologist <br /> VII. Additional Comments, Data,etc. <br /> ' Ross Tinline,California Registered Geologist#5860, stated in the Pacific Environmental Group's November 12, 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. <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official site file. <br />