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Exhibit N Page 1 of 2 <br /> Case Closure Summary Page 2 <br /> Leaki Underground Fuel Storage Tank Qcgram <br /> III. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) l Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before :'After Before After Before After <br /> TBH (Gas) 410. <1.0 1.70 X0.05 Xylene 5000. <5.0 0.0028 1<.0005 <br /> TPH (Diesel) 89. <1.0 <0.05 <0.05 Ethylbenzene 3900. <5.0 0.0011 <.0005 <br /> Benzene 490, <5.0 <0.0002 <.0005 Oil & Grease 360. 91. 0.0010 I<1.0 <br /> 5 Heavy metals <TLC NT NT <br /> Toluene 1300. c5.0 0.0009 c.000 vy � <br /> Other i; Other (HALO} c0.5 NT <br /> <0.0005 NT <br /> Comments (Depth of Remediation, etc.) : <br /> ON FEBRUARY 22, 1994 BACKHOE APPROX 40 CUBIC YARDS <br /> i <br /> DISCOLORED AND MALODOROUS SOIL IN AREA OF WASTE OIL TANK. BOTTOM SOIL SAMPLES ATII8 'BGS <br /> i <br /> ND AS NOTED IN °AFTER" COLUMN SECTION III ABOVE. SOIL TO FORWARD LAND FILL.- <br /> IV. Closure <br /> r <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 <br /> Monitoring wells Decommisioned: YES Number Decommisioned: 3 Number Retained: 0 <br /> List enforcement actions taken: NOR (6/8/90) <br /> i <br /> I List enforcement actions rescinded:' n/a <br /> V. Local Agency Representative Data I <br /> Name: DO NN RAN /MARGARET LAGORIO' Title: DIRECTOR / LOP SUPERVISOR <br /> Signature: L GA,4,tL-- <br /> Date: 06 MAR 1998 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 23 OCT 1997 RB Response: CONCURRENCE FOR NFA <br /> RWQCB Staff Name: Pat Anderson Title: ENG-HYDRO-GEO Date: 19 NOV 1997 <br /> j VII. Additional Comments, Data, etc. <br /> MW-1 AND MW-3 HISTORICALLY NON-DETECT SINCE INSTALLED 2/5/93. MW-2 LAST HITS11ON JTUNE <br /> 27, 1995 (TPH-G =620 ug/l, B=<0.5, T=12, 9=29, X=7.) ALL WELLS, INCLUDING MW-2, ARE NOW <br /> NON-DETECT. LAST SAMPLE DATE 10/9/96. <br /> �MW-2) WERE, AND STILL ARE NON DETECT. LAST SAMPLING DATE 10/9/96. MONITORING WELLS <br /> DESTROYED UNDER PERMIT BY PRESSURE GROUTING ON 09 MARCH 1998. NFA ISSUED 16 MARCH 1998. <br /> . i <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the leadlagency <br /> as part of the official site file. (08/24/93) <br />