Laserfiche WebLink
Y Case Closure Summary Page <br /> making Underground Fuel Storage Tank Pn.�am <br /> III Release and Site Characterization Information (continued) <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 /> TPH (Gas) 13001 13001 3.4 3.8 Ethylbenene 21001 21001 0.110 0.058 <br /> Benzene ND1 ND1 0.0012 0.008 Xylene 43001 43001 0.235 0.203 <br /> Toluene 20001 20001 0.0018 ND MTBE NA ND@0.004 ND,.002 ND,.002 <br /> Comments: <br /> Soil data from continuous core borehole(B-5)total depth 80' bgs completed 8/26/98 significantly lower than B-2 listed above. <br /> 1 Data from B-2 non-detect to 30'bgs, listed detections above @ 50' bgs from B-2 completed as MW-2 on 02/12/97. Water data <br /> above from MW-2 10/20/97 and MW-4 8127/98 monitoring data. Site data suggests majority of contaminants observed not from <br /> on-site activities. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? YES <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? YES <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land use changes? NO <br /> Monitoring/Vapor wells decommissioned: 4 Number Decommissioned: 4 Number retained: NONE <br /> List enforcement actions taken: NOR 7/3/96 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 04/16/99 Response Date: <br /> RB Staff: MARK LIST Response: No response <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc- <br /> DA A <br /> tc.DATA GENERATED BY REGISTERED GEOLOGIST/CONSULTANT SUGGESTS THAT MAJORITY OF <br /> CONTAMINATION OBSERVED NOT FROM ON-SITE ACTIVITIES. LOW RISK SITE. INSIGNIFICANT RESIDUAL <br /> MASS VOLUME. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br /> site file. <br />