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III. Soil Remediation Information <br /> Soil remediation method(s) EXCAVATION - PROPOSED THERMAL TREATMENT <br /> Volume treated and/or removed - 400 CUBIC YARDS REMOVED <br /> Contaminated soil disposal site WESTERN STONE/HUGHSON , 1100 LOWE ROAD, HUGHSON <br /> If contamination is remaining, describe concentration range and volume (cubic yards or meters) <br /> APPROXIMATELY 100 CUBIC YARDS, CONC. RANGE, ND - 180 ppm . TPHD <br /> -, Table III - Maximum documented contaminant concentrations in soil before and after cleanup <br /> [Heavy <br /> ntaminant Method Before After Depth Contaminant Method Before After Depth <br /> used (mg/kg) (m8/1t8) (ft) � (mg/kg) (mg/kg) (ft) <br /> H (Gas) N A Benzene 8020 0.65 ND $ <br /> H (Diesel) Toluene <br /> _ n <br /> er fuel Ethylbenzene 4.5 1 .3 8` <br /> metals N/A An2o Xylene 6.7 .93er Other <br /> N. Groundwater Remediation Information <br /> Groundwater remediation method(s) PUMP FROM PIT/B IOREMEDIATE <br /> Volume treated and/or removed 21 ,000 GALLONS <br /> If contamination is remaining, describe concentration range and volume (gallons or liters) <br /> NONE <br /> Table N -Maximum documented contaminant concentrations in groundwater before and after cleanup <br /> Counniinant Method Before After Depth Contaminant Method Before After Depth <br /> j used (108/1) (Ing/1) Ut) used (mg/1) (108/1) (ft) <br /> TPH (Gas) Benzene .042 ND <br /> TPH-(Diesel) <br /> 8015 110 ND TOIueJ°i° 04 ND " <br /> Other fuel Ethylbenzene 8020 .041 ND <br /> F--= <br /> Heavy tt2etaLs Xylene sola .014 t UQ " <br /> j other Ocher <br /> .a V. Closure <br /> Does Regional Board concur with closure? Yes No <br /> Rationale for closure <br /> Location of reports on file (Agency/Room) <br /> 4 <br /> i:z'COtlftty—...... Staff person Phone <br /> Regional Board office Staff person Phone <br /> :,j Sla cheklim"10 Sqn=* r 2993 <br />