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ee Closure Summary Page 2 <br />Leaking erground Fuel Storage Tank Pram <br />III. Release and Site Characteation Information (continued) <br />Maximum Documented Contaminant Concentrations --Before and After Cleanup <br />per the Regional Board <br />Contaminant <br />Soil <br />(ppm) <br />Water <br />(PPB) <br />Contaminant <br />Soil (ppm) <br />Water <br />(PPB) <br />Date: <br />Before <br />After <br />Before <br />After <br />List enforcement actions taken: INITIAL DIRECTIVE LETTER <br />Before After <br />Before <br />After <br />TPH (Gas) <br />---- <br />---- <br />Xylene <br />370 <br /><.005 <br />---- <br />2.0 <br />TPH (Diesel) <br />5500 <br /><50 <br />Ethylbenzene <br />6.8 <br /><.005 <br />---- <br /><0.3 <br />Benzene <br /><5.0 <br /><.005 <br />=2 <br />- <br />Oil & Grease <br />---- <br />---- <br />---- <br />---- <br />Toluene <br />160.0 <br /><.005 <br />Heavy metals <br />---- <br /><5.0 <br />---- <br />---- <br />Other <br />Other <br />Comments (Depth of Remediation, etc.): <br />BULK OF IMPACTED SOIL REMOVED BY <br />OVER -EXCAVATION. THIS SITE IS SITUATED IN THE <br />MIDDLE <br />OF A TCE PLUME WHICH IS UNDERGOING INVESTIGATION AND CLEANUP BY THE DISCHARGER. <br />RISIDUAL LEVELS OF <br />BENZENE/XYLENE <br />IN GROUNDWATER DO NOT WARRANT ADDITIONAL REMEDIATION. <br />IV. Closure <br />Does completed corrective action protect existing beneficial uses <br />Basin Plan? YES <br />per the Regional Board <br />Does completed corrective action protect potential beneficial uses <br />Basin Plan? YES <br />per the Regional Board <br />Does corrective action protect public health for current land use? <br />YES <br />Site management requirements: NONE <br />Staff Name: <br />Date: <br />Title: <br />Should corrective action be reviewed if land use changes? NO <br />Date: <br />Monitoring wells Decommisioned: NO <br />Number Decommisioned: <br />Number Retained: 1 <br />List enforcement actions taken: INITIAL DIRECTIVE LETTER <br />List enforcement actions rescinded: NONE <br />V. Local Agency Representative Data <br />Name: DONNA HERAN <br />Submitted to <br />Title: <br />DIRECTOR, <br />ENVIRONMENTAL HEALTH DIVISION <br />(Signature: <br />RWQCB <br />Staff Name: <br />Date: <br />VI. RWQCB Notification <br />Date <br />Submitted to <br />RB: <br />RB <br />Response: <br />RWQCB <br />Staff Name: <br />BOGGS <br />Title: <br />UGT MANAGER <br />Date: <br />VII. Additional Comments, Data, etc. <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 />