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Case Closure Summary Page 2 <br /> Leak Underground Fuel Storage Tanlr -ogram <br /> III. Release and Site Char rization Information (continti <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPS (Gas) 5,300 130 2.399 ND Xylene 250 9.1 .4543 ND <br /> TPH (Diesel) Ethylbenzene NA .46 .0773 ND <br /> Benzene 19.0 <.005 .8354 ND Oil a Grease <br /> Toluene 510 .042 .305 ND Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc.) :HIGHETS DTW ON 03/23/87 AND LOWEST IN EA5 ON 10/18/ S. <br /> CONCENTRATIONS DETECTED IN GROUNDWATER (BEFORE) WERE OBTAINED FROM MW2 ON 03/19/87. <br /> ROUNDWATER (AFTER) COLLECTED ON 06/02/94 WERE ALL NON-DETECT. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does corrective action protect public health for current land use? (Yes) No <br /> Site management requirements: <br /> NONE FOLLOWING MONITORING WELL DESTRUCTION. <br /> Should corrective action be reviewed if land use changes? Yes (No) <br /> Monitoring wells Decommisioned: (Yes) No Number Decommisioned: 8 Number Retained: 0 <br /> List enforcement actions taken: <br /> NOR ON 04/05/90, 01/14/91, 10/14/92, 01/11/93 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA RAN Title:DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: �• .� ti Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB:12/15/95 RB Response: <br /> RWQCB Staff Name: GORDON BOGGS Title: PROGRAM COORD. Date: <br /> VII. Additional Comments, Data, etc. <br /> GROUNDWATER TECHNOLOGY HAS ESTIMATED THAT APPROXIMATELY 262 POUNDS OF HYDROCARBONS REMAIN <br /> WITHIN THE VOLUME OF SOIL CONTAMINATED. CURT PECK, RG #5337, OF CHEVRON RESEARCH AND <br /> TECHNOLOGY COMPANY INDICATES THAT RESIDUAL HYDROCARBONS IN THE SOIL DO NOT POSE A THREAT <br /> TO GROUNDWATER. <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 />