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- Case closure Summary Page 2 _ <br /> Leak`' T Underground Fuel Storage Tank -ogram <br /> III. Release and Site Chaz '.erfzation Information (continuf <br /> Maximum Documented Contaminant Concentrations--Before and After Claasup <br /> Contaminant Sail (ppm) water: {ppm} Contaminant Soil (ppm) Water (Ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 5,300 130 2.399 ND Xylene; Z50 9.1 .4543 ND <br /> TPH (Diesel) Ethyl$enzeae NA .46 .0773 ND <br /> Benzene 19.0 c.'005 .8354 ND Oil &]Grease <br /> Toluene 510 .042 .305 ' ND Heavy'metaIs <br /> Other Other; 1 <br /> Comments (Depth of Remediation, etc.'} :HIGHETS DTW ON 03/23/87 AND LOWEST IN EAS ON 10/18/ 5. <br /> CONCENTRATIONS DETECTED IN GROUNDWATER (BEFORRY'WERE OBTAINED FROM'MW2 ON 03/19/87. <br /> ROUNDWATER (AFTER) COLLECTED ON 0,6/02/94 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 pub'li'c health forcurrent land use? (Yea) NO l <br /> Site management requirements: 1 <br /> NONE FOLLOWING MONITORING WELL DESTRUCTION. <br /> Should corrective action be reviewed if land use` changes? Yes (No) <br /> Monitoring wells Decommisioned: (Yea) 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 List enforcement actions rescinded: " NONE 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 ERAN Tztle:DIRECTOR OF ENVIRONMENTAL'HEALTH <br /> Signature: ��.�,.. . ,` Date:VI. RWQCB RWQCB Notification <br /> Date Submitted to RB:12/15/95 ;RB Response`s° <br /> s <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 VOLUBM 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 /> I <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by` ths lead agency <br /> as part of the official site file. (08/24/93) <br /> I <br /> Exhibit N Page 2 of 2 <br />