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Ling Underground Fuel Storage Tank P�► ram <br /> Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br /> m Contaminant Soil (ppm) Water {ppm} <br /> Contaminant Soil (ppm} Water (pp ) naBefore After Before After <br /> Before After Before After <1.2 <0.005 0.0564 .0043 <br /> TPH (Gas) 3,300. <0.1 9.0 1.7 Ethyl-benzene <0,01 0.210 0.034 <br /> <0.1 63. 6.2 <br /> TPH {Diesel} . 5,800• 1.9 1 2I DCA* <5.0 <0.005 0.0020 NA <br /> TPH (Stoddard) 4,500. NA*<0.0 110. <0 0005 EDB <5.0 <0.005 <0.005 NA <br /> Benzene 6.3 <0.005 0.0013 <br /> <.3 <0.005 0.013 X0.0005 Lead 7.6 NA NA NA <br /> Toluene MtBE <1.0 <0.005 <0.0066 I NA <br /> Comments NOTE: GROUNDWATER RESULTS IN PARTS PER MILLIONI <br /> *: 1,2-Dichloroethane. *": not analyzed after first time <br /> Over-excavation was the only remediation performed at the site. Monitoring wells 1, 2 &3 sampled quarterly for 2.5 <br /> years(10 times) since installation in September 1998. MW-4 installed offsite and upgradient on 4-10-00 and <br /> sampled four times during 2000 only(always non-detect). TAME, DIPE,TBA ETBE sampled one time in soil and <br /> groundwater by 8260 on September 18, 1998 and non-detect at acceptable detection limits. MW-3 (in former UST <br /> pit) hottest of all wells and soil and groundwater data listed above from this well. Hottest detection is initial. <br /> sampling event ('before' column) and most current groundwater or deepest soil data in 'after' column. Most <br /> current groundwater sampling event done on 12-08-00. <br /> IV. Closure <br /> ct existing beneficial uses per the Regional Board Basin Plan? YES <br /> Does completed corrective action prote <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? Not necessary <br /> Have the Monitoring/Vaporwells been decommissioned? No,.not yet Number Decommissioned: 0 <br /> Number retained: 4 <br /> List enforcement actions taken: NOR, 4-24-97 <br /> List enforcement actions rescinded: nla <br /> V. Local Agency Representative Data <br /> Name: Donna Heron I Margaret Lagorio Title: Director of Envn Health ! LOP Supervisor <br /> i Signature: Date: 7 1 3 i j o l <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Marty Hartzell Response: <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc <br /> Only corrective action proposed or conducted at°site was over-excavation of 70 cubic yards of soil in former UST <br /> pit area under PHS-EHD approval and oversight in September 1998. Slant boring "SB-2A' installed south of UST <br /> pit and MW-3 area under building to determine 'south quadrant' delineation on March 23, 2000. The boring was <br /> advanced 30 degrees off of vertical towards the south to -30' bgs. Soil and groundwater samples were non-detect <br /> for TPH as G, D, &SS, and BTEX and five oxygenates. Well surve indicated no drinking water wells threatened. <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 /> MI!7/01 <br />