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• Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization Information (continued) <br /> FFMaxj�imu== 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 /> TPH (Gas) 800. 11,900 <.050 1<.050 Xylene 125.0 170.0 <.0005 <.0005 <br /> TPH (Diesel) <.100 <.100 Ethylbenzene 35.0 <.0005 <.0005 <br /> Benzene 1.1 20.0 <.0005 <.0005 Oil & Grease <br /> Toluene 39.0 96.0 <.0005 <.0005 Heavy metals <br /> Other I I Other <br /> Comments (Depth of Remediation, etc.) : Highest DTW in MW1 on 11/6/89 and lowest in MW1 on <br /> 8/20/92. Concentrations detected in soil (before) were obtained from Sample #2 at 6' on <br /> 6/6/88. Soil contamination after the excavation attempt from NW-5.5W at 5.5' on 7/27/92. <br /> Residual defined by additional soil borings. <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: None <br /> Should corrective action be reviewed if land use changes? (Yes) No <br /> Monitoring wells Decommisioned: (Yes)No Number Decommisioned: 1 Number Retained: 0 <br /> List enforcement actions taken: NOR on 8/15/89 and 1/14/91. <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Maran Title: Director <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: None: Soils only site <br /> RWQCB Staff Name: Gordon Boggs Title: Program Coord. Date: <br /> VII. Additional Comments, Data, etc. <br /> Jeanne Homsey, Reg. PE #CO47410 currently with Smith Environmental estimated that the <br /> volume of residual soil contamination was 65 cu. yds. containing 241 lbs (36 gal) of <br /> gasoline range hydrocarbons and 195 lbs (28gal) of diesel range hydrocarbons. <br /> Based on leaching, using SESOIL modeling, groundwater is not anticipated to be impacted <br /> by the residual soil contamination. <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 />