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F <br /> ,-Case Closure Summary Page 2 i <br /> Leakin % ' 'arground Fuel Storage Tank r '-'n <br /> III. Release and Site Character' "tion thformation (continueav-,4--/ <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup 'I ' <br /> Contaminant Soil (ppm) Water (PPB) Contaminant Soil (ppm) Water (BPB) <br /> Before After Before. After Before After Before After <br /> TPH (Gas) 3,100. N/A* 1600. <50.] Xylene 290.0 N/A* 31.0 ,<0.5 <br /> TPH (Diesel) 20000. 20000** 330. <50.1 Ethylbenzene 43.0 N/A* 6.8 I<0.5 <br /> Benzene 2.6 N/A* <0.5 <0.5; Oil & Grease ---- ---- ---- - -- <br /> Toluene 160.0 <.005 2,800. 0.8 '] Heavy metals 13.0 <5.0 ---- ---- <br /> Other Other jj <br /> Comments (Depth of Remediation, etc.) : j I` <br /> SULK OF DIESEL IMPACTED SOIL REMOVED BY OVER-EXCAVATION. SOIL VAPOR EXTRACTION APPLIED <br /> TO LIMITED SOIL PLY]ME. *NO CONFIRMATION BORINGS REQUIRED AS INITIAL LEVELS LOW AND AN <br /> ESTIMATED 190 LBS REMOVED. GROUNDWATER IS FREE OF HYDROCARBONS.**SOLUBLE LEVEL=11i3MG/L I <br /> IV. Closure , ! <br /> Does completed corrective action protect existing beneficial uses per the Regionalj�Board <br /> Basin Plan? YES E i <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Pian? YES <br /> Does corrective action protect public health for current land use? YES I <br /> Site management requirements: NONE <br /> Should corrective action be reviewed i.f ',,land use changes? NO ;Ia <br /> Monitoring wells Decommisioned: YE5 ( Number Decommisioned:09 Number Retained: 00 <br /> I <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER I� i <br /> u <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA RAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: j Date: -{ 7� 6 �I <br /> VI. RWQCB Notification <br /> ii <br /> Date Submitted to RB: 03-11-96 RB Response: CONCURRENCE 1p <br /> RWQCB Staff Name: J. HRATHOVDE Title: ! ASSOC ENG Date: 04-05-96 II <br /> VII. Additional Comments, Data, etc. <br /> + I I r <br /> I� <br /> I <br /> r i <br /> fl <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. (0`8/24/93) .I <br /> Exhibit N Page 2 of 2 i' <br />