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_ Case Closure summary Page 2 <br /> Lea" -zg Underground Fuel Storage Tan" -5rogram <br /> III. Release and Site Chk terization Information (contin' �) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water,' (PPm) Contaminant Soil (ppm) Water (ppm) J <br /> Before After Before After Before After Before After j <br /> TPH (Gas) T410. <1.0 1.70 <0.05 Xylene 5000. <5.0 0.0028 <.0005TPH (Diesel) 0 <0.05 <0.05 Ethylbenzene 3900. <5.0 0.0011 <.0005 <br /> Benzene 0 <0.0002 <.0005 Oil & Grease 360. 91. 0.0010 <1.0 <br /> Toluene 0 0.0009 :.0005 Heavy metals <TLC NT <br /> OtherNT <br /> Other (HALO) <0.5 NT :0.0005 NT <br /> Comments (Depth of Remediation, etc.) : <br /> ON FEBRUARY 22, 1994 BACKHOE APPROX 40 CUBIC YARDS <br /> DISCOLORED AND MALODOROUS SOIL IN ,AREA OF WASTE OIL TANK. BOTTOM SOIL SAMPLES AT 8 'BGS <br /> ND AS NOTED IN "AFTER" COLUMN SECTION III ABOVE. SOIL TO <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? Yes <br /> Does corrective action protect public health for current land use? Yes <br /> Site management requirements: NONE REQUIRED <br /> Should corrective action be reviewed if land use changes? Yes i <br /> Monitoring wells Decommisioned: No Number Decommisioned: Number .Retained: 3 <br /> List enforcement actions taken: NOR (6/8/90) <br /> i <br /> List enforcement actions rescinded: n/a i <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio, REHS Title: Lop Supervisor <br /> Signature: Date: 21 OCT 1997 i <br />_ VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: Pat Anderson Title: ENG-HYDRO-GEO Date: <br /> vii. Additional Comments, Data, etc. <br /> MW-1 AND MW-3 HISTORICALLY NON-DETECT SINCE INSTALLED. 2/5/93. MW-2 LAST-HITS ON JUNE <br /> 27, 1995 (TPH-G =620 ug/l, B=<0.5, T=12, E=29, X=7.) ALL WELLS, INCLUDING MW-2, ARE NOW <br /> NON-DETECT. LAST SAMPLE DATE 10/9/96. <br /> IMW-2) WERE, AND STILL ARE NON DETECT. LAST SAMPLING DATE 10/9/96. <br /> I <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency s <br /> as part of the official site file. " (08/24/93) <br /> Exhibit N Page 2 of 2 <br />