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d . o <br /> lase Closure Summary Page 2 <br /> Leakinl,,,,Jnderground Fuel Storage Tank Pram <br /> III. Release and Site Characterization information, (continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> m Contaminant Soil (ppm) Water (ppm) <br /> Contaminant Soil (ppm) Water (ppm) Before After Before After <br /> Before After Before After <br /> TPH (Gas) 5000 .53 .15 xylene 904 .002 <.0003 <br /> LBenzene <br /> (Diesel) NA .52 <.05 Ethylbenzene 288 <.0003 <.0003 <br /> 68 .002 <.0003 Oil & Grease NA <br /> ene 282 .00046 <.0003 Heavy metals NA <br /> r Other NA <br /> Comments (Depth of Remediation, etc.) : <br /> SOIL RESULTS FROM FEB 1990 TANK PULL. NO SOIL BORINGS PLACED IN TANK PIT, BUT SURROUNDED <br /> BY MW-1, 2, AND 4. SOIL FROM WELL PLACEMENTS SHOWED ONLY MW-2 @20' BGS HAD TPH-G AT 130 <br /> PPM, NO BENZENE AND X=0.22 PPM. NO CONFIRMATION BORINGS DONE. GW CONTAM DECLINING. <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: SITE CURRENTLY UNDERGOING CVRWQCB INVESTIGATION UNDER WENDY <br /> WYELS FOR PESTICIDE. MRP#96-817 DIRECTS ALL UGT MONITORING WELLS TO REMAIN INTACT. <br /> Should corrective action be reviewed if land use changes? No UGT <br /> Monitoring wells Decommisioned: Number Decommisioned: 0 Number Retained: 6 <br /> List enforcement actions taken: NOR,1/25/93 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name:DONNA H Title: DIRECTOR, PHS-EHD <br /> Signature: Date: JANUARY 8, 1997 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name:J. BRATHOVDE Title: AEG Date: 12/06/96 <br /> VII. Additional Comments, Data, etc. <br /> NO CORRECTIVE ACTION/REMEDIATION PERFORMED AT SITE.MONITORING OF SIX (6) WELLS SINCE FEB <br /> 1993, INDICATED THAT TREND OF REDUCING GROUNDWATER CONTAMINATION WAS OCCURING. PREVIOUSLY <br /> UNKNOWN 6000 GALLON DIESEL TANK AND TWO (2) OTHER MONITORING WELLS DISCOVERED DURING <br /> INVESTIGATION (14W-5 AND MW-6) . CONCURRENT CVRWQCB PESTICIDE INVESTIGATION STILL IN PROGRESS <br /> IAT SITE. SECOND ZONE MW'S PLACED UNDER W. WYELS REQUIREMENTS AND SAMPLED FOR UGT CONSTITUENTS <br /> AND REPORTED AS NON DETECT.MW'S 1, 2, 3, 4, 5, AND 6 NOW UNDER CVRWQCB OVERSIGHT, WENDY WYELS <br /> IS NEW CONTACT. <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 />