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VUI . Vc VV IIVL) 14 - VU IVII DVI IGL• LU7LJ7/Ubb Y, UUS <br /> ' Leaking Underground Fuel Storage Tank Program <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) 4100 Ethyl-benzene 17 <br /> TPH (Diesel) NT Xylene 150 <br /> Benzene <0.005 <br /> Toluene <0.005 Acetone 790 <br /> NTSE 0.0074 <br /> Comments NOTE: GROUNDWATER RESULTS IN PARTS PER MILLION! <br /> ' LOW LEVELS OF SOIL CONTAM AT UGT#2 ONLY AT REMOVAL (MAY 1990)OF THP-G--340 ppm, X=39 and F=3.7 <br /> JUST BELOW UGT at -6' bgs. SITE WAS LOW PRIORITY BY LOP EVAL. SEASONAL HIGH GROUNDWATER, <br /> (SPRING 1983) at 45 bgs. HISTORICAL LOW AT 80'+bgs (FALL 1978). ONE GEOPROSE (AUG 18. 1997) TO 64' bgs <br /> REVEALED THPH-G (4100ppm), E=17 ppm, and X=150 ppm at 15' bgs. MTBE= 0.0074 ppm at 46' bgs BY 0020 ONLY <br /> AND NO 8260 CONFIRMATION. NO GROUNDWATER at 64' bgs and NO WATER SAMPLE OBTANINED. SOIL at 20', <br /> 25', 46', AND 64' bgs, ALL=ND FOR TPH-G AND BTEX. Unconfirmed Acetone hit of 780 mg/kg at 46' bgs, known to be <br /> -- seasonal groundwater-depth and may be smear from other source. <br /> IV. Closure <br /> ' Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? NO CAP REO'D <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? N/A <br /> t Does corrective action protect public health for current land use? N/A <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land use changes? NO <br /> Have the MonitoringA/apor wells been decommissioned? N/A Number Decommissioned: N/A Number retained: 0. <br /> List enforcement actions taken: NORR,04/24/97 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: Donna Heran / Margaret LagorioTitle: Director of Environmental Health/LOP Supervisor <br /> Signature: n / Date: 1—f r/�� <br /> ' VI. Central Valley Regional Water Quality Control Board Re Nocation <br /> Date Submitted to RB: 31 DEC 1997 Response Date: os JANUARY 1996 <br /> RB Staff: PAT ANDERSON Response: NFA CONCURRED <br /> tTitle: En ineer <br /> VII. Additional Comments, Data, etc. <br /> VERTICAL SOIL INVESTIGAITON INDICATED NO CONTAMINATION MIGRATED BELOW 15' bgs TO 20' bgs. THE <br /> SHALLOWEST GROUNDWATER RECORDED IS AT 45' bgs AND SOIL FROM 46,'WAS ND FOR PETROLEUM. <br /> ATTEMPT TO OBTAIN A GROUNDWATER SAMPLE VIA GEOPROBE RESULTED IN REFUSAL IN TIGHT SOILS AT 64'. <br /> TEHD O I <br /> E MORE SAMPLING AFTER SOIL DATA INDICATED VERTICAL MIGRATION REQUIRED- <br /> M GRATION PDAST 15' DECISION NOT <br /> SSION <br /> O REQUIRE <br /> ' CONSULTANT REQUESTED NFA, EHD CONCURRED. <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 /> MU 01/27198 <br />