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FINAL REMEMAT10N PLAN <br /> 14900 West Frontage Road Manteca California <br /> 3.2 Pro osed Cleanuo Levels <br />' Listed below are proposed target concentrations of petroleum hydrocarbons in <br /> groundwater and soil to be achieved through remedial efforts at the site Once it is <br />' demonstrated the proposed target concentrations have been reached, groundwater <br /> quality trends will be assessed and a recommendation for site closure will be made <br /> Contaminant Target Concentrations <br /> Constituent Groundwater Soil <br />' Benzene 1 0 erg/L. 2 5 mg/L <br /> Toluene 2000 ug/L. 2 5 mg/L. <br />' Ethylbenzene 680 Ng/L 2.5 mg/ <br /> L <br /> Total Xylenes 440 /.[g/L. 2.5 mg/L. <br /> The proposed target concentrations for groundwater comply with the federal maximum <br /> contaminant levels (MCL) and the proposed secondary MCL in groundwater for the listed <br /> constituents The proposed target concentrations for soil comply with levels presented <br />' in the Leaking Underground Fuel Tank Field Manual using the appropriate worksheets for <br /> the listed constituents <br /> 3.3 System Design Parameters <br /> 1 <br /> 3.3.1 Liquid Discharge <br />' <br /> Analytical data collected during r <br /> Yt g g oundwater monitoring and aquifer testing were used in <br /> the design of the groundwater treatment system The system has been designed to meet <br />' the anticipated discharge requirements as follows <br /> Discharge Parameters <br /> Parameter Discharge Concentration <br /> TPH <5 0 mg/L <br /> BTEX sum of BTEX < 0 5 mg/L <br /> Benzene <0 05 mg/L <br /> PH 6-9 <br /> Free Product no visible sheen <br /> Analysis of data indicates during the winter months the aquifer may sustain a yield of <br /> approximately 6 gpm In anticipation of seasonal groundwater fluctuations, the system <br /> has been designed to treat water at a maximum of 10 gpm, with a water temperature of <br /> 55° F <br /> 90-097A FRP <br />