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Case Closure Summary Page 2 <br /> Leaking underground Fuel Storage Tank Program <br /> III. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations--Before and'< Aftej7 Cleanup <br /> Contaminant Soil (ppm) Water (PPB) Contaminant Soil , (ppm) ater {ppg) <br /> Before After Before After Before After :BteforeAfter <br /> TPH (Gas) 5,400. 2,300. ---- -- Xylene 1',460. c0.012 <br /> TPH (Diesel) ---- ---- ---- ---- Ethylbenzene 240.0' 0.19 ---- ---- <br /> Benzene 0.83 <.004 ---- ---- Oil & Grease --- - - <br /> Toluene 2.0 c.004 ---- -- Heavy metals 11.10 ---- ---- --- <br /> Other Other '� ---- ---- ---- <br /> I, <br /> Comments (Depth of Remediation, etc.) : If <br /> BULK OF IMPACTED SOIL REMOVED BY OVER-EXCAVATION. RESIDUAL SOIL CONTAMINATION ESTIMATED <br /> TO BE APPROXIMATELY 10 GALLONS OF TPH GASOLINE IN SOIL BETWEEN 10' AND 28, BELOW GRADE. <br /> EXCAVATED PIT BACKFILLED WITH CONTROLLED DENSITY FILL (CONCRETE SAND MIXTURE) <br /> IV. Closure <br /> i Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? YES i <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? YES ;; <br /> �I <br /> Does corrective action protect public health for current Zand use? YES <br /> Site management requirements: NONE <br /> I. <br /> if <br /> Should corrective action be reviewed if land use changes? ; NO <br /> l <br /> Monitoring wells Decommisioned: N/A Number Decommilsioned: -- Number Retained:-- <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER' <br /> List enforcement actions rescinded: NONE <br /> ;l <br /> V. Local Agency Representative Data <br /> i Name: DONN ERAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Date: ., <br /> VI. RWQCB Notification i1 <br /> Date Submitted to RB: RB Response: NA <br /> RWQCB Staff Name: BOGGS Title: UGT MANAGER Date: <br /> VII. Additional Comments, Data, etc. 11 <br /> f <br /> *****SOIL ONLY***** <br /> It <br /> n <br /> i�. <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 /> r <br /> Y i <br />