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mss - .M Case Closure summary Page �2 <br /> Leakin- :Underground Fuel Storage Tank Pv gram <br /> III. Release and Site CharaF:. rization Information (continued <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> a` Contaminant Soil (ppm) Water (ppm) Contaminant Soil p (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> s <br /> TPH (Gas) 33 1.4 0.0057 ND.05 Xylene 0.15 0.0690 ND.0005 ND <br /> TPH (Diesel) 720 1.9 0.240 ND.05 Ethylbenzene 0L21 0.0068 ND.0005 ND <br /> Benzene 0.10 0.033 ND.0003 ND Oil & Grease `.'; N/A <br /> Toluene 0.052 0.051 ND.0003 ND Heavy metals 0`:092 <br /> Other Other Pb(WET.) <br /> Comments (Depth of Remediation, etc.): <br /> Soil was excavated to below groundwater surface. Residual soil contamination documented <br /> during the installation of MW2 and MW3 was subsequently investigated and determined to <br /> be extremely limited. <br /> IV. Closure <br /> .R <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Pian? (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: None s <br /> I� <br /> Should corrective action be reviewed if land use changes?ft Yes! (No) <br /> Monitoring wells Decommissioned: (Yes) No Number Decommissioned:2 Number Retained:. 2 <br /> List enforcement actions taken: NOR sent 1-23-92 and 5-28. 93 ` <br /> �I <br /> List enforcement actions rescinded: None { <br /> V. Local Agency Representative Data <br /> Name: DONNA ERAN Title:REHE," DIRECTOR �ENVIPQNMENTAL HEALTH <br /> Signature: ' Date:i1 6 :!L--)-- <br /> VI. RWQCB Notification <br /> Date Submitted to RB:3-9-94/3-15-94 RB Response: verbal concurrence E <br /> RWQCB Staff Name: Thayer Title: Assoc. Eng Date:ll3-9-94 <br /> VII. Additional Comments, Data, etc. I� II <br /> Residual soil contamination evidenced during the installation of MW2 was found <br />` through subsequent investigation to be very limited and�not to pose a significant <br /> threat to groundwater. E <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 /> E <br /> Exhibit N Page 2 of 2 <br />