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i <br /> Case Closure Summary Page .2 <br /> e Tank <br /> III.j,, Release and Site Characterizationund InformationFuelr(continued)ogram <br /> Maximum Documented Contaminant Concentrations--Before and After cleanup <br /> C6ntaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) „later <br /> Before After Before After Before After Before After. <br /> TPH {Gas) 5,100 >1 1.0 >.05 Xylene 210 >.003 <br /> TPH {Diesel} .130 >.0003 <br /> Benzene Ethylbenzene NA >.003 .026 >.0003 <br /> ND >2 >.003 .008 >.0003 Oil & Grease <br /> Toluene 17 >.003 .068 >.0003 Heavy metals 18 Pb >4 <br /> Other Other (EDB) NO .2 .00Ob9 >.00002 <br /> Comments (Depth of Remediation, etc.) : <br /> 1990 over-excavation to 10' followed by further excavation to 15' . The soil was aerated <br /> and used for backfill. Residual soil contamination was evidenced. Subsequently a vapor <br /> extraction system was installed in April 1992 and operated until January 1993, <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does completed corrective action protect potential beneficial uses per the Regional 'Board <br /> Basin Plan? (Yes) No <br /> rDecorrective action protect public health for current land use?. (Yes) No <br /> anagement requirements: None <br /> corrective action be reviewed if land use changes? Yes (No) <br /> ring wells Decommisioned: (Yes) No Number Decommisioned: 4 Number Retained: 0 <br /> nforcement actions taken: NOR sent 08-15-90 and 01-14-91 <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name; Donna Heran Title: Director of' Euvironmental` Health, RENS <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> C <br /> Date Submitted to RB:9-27-93/8-1-94 Response: 9=8-94 letter to RP with site history <br /> RWQCB Staff Name: E. Thayer Title: Assoc. Engineer Date: <br /> VII. Additional Comments, Data, etc. <br /> r <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency <br /> as part of the official site file. (08/24/93) <br /> Exhibit N Page 2 of 2 <br />