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l <br /> PES Environmental, Inc. <br /> Ps Mr. eff Werner <br /> February i2, 1991 <br /> Page 7 <br /> FES will analyze the water-level data obtained from the aquifer test and using various <br /> t.r analytical procedures, estimate the aquifer properties. These properties will then be - <br /> used for designing the extraction system. <br /> F.y ludas of Gtyucttlw�f�r Reined-Lnt,ion Alternatives_ <br /> PFS will perform a detailed evaluation of groundwater extraction, treatment. and disposal <br /> t options. On the basis of available information on types of subsurface materials; depth to <br /> j : <br /> groundwater; petroleum hydromrbon types, concentrations, and distributions; and <br /> aboveground site constraints, PES has performed a preliminary evaluation of remedial <br /> options that ata applicable at the GLDM site. Groundwater extraction options include <br /> extraction wells and extraction trenches. Practical groundwater treatment options include: (1) <br /> discharge to the sanitary sewer and subsequent treatment by the City of Lodi wastewater <br /> f..b treatmsttt facility, (2) canstntction of an air stripping system, (3) construction of an <br /> aboveground biotreatment system (Plate 3), (4) construction of a chemical oxidation system <br /> i Disposal of treated <br /> (Plate 4), and (5) construction of a carbon adsorption system (Plate S). pQ <br /> 4.� groundwater from an air stripping, biotreatment, chemical oxidation, or carbon adsorption <br /> system would be either to the sanitary sewer according to the City of Lodi wastewater <br /> treatment facility regulations or to the storm sewer via a National Pollution Discharge <br /> Elimination System (NPDES) Permit. <br /> Given site conditions, the most cost-effective method for extracting groundwater is using <br /> extraction wells. The depth to groundwater makes extraction trenches cost-prohibitive. PES <br /> envisions that a single extraction well located at the southwestern corner of the GLDM site j <br /> will be required to control petroleum hydrocarbon-affected groundwater migrating offsite. <br /> g n well will provide information on the hydraulic <br /> An aquifer test on the proposed extractio <br /> g antity and concentration of petroleum hvdrocarbons in <br /> properties of the aquifer. the qu <br /> the well, and the capture zone of the well. <br /> groundwater yielded from <br /> 3 <br /> Informal discussions with the Assistant Waste Water Superintendent of the City of Lodi <br /> indicate that groundwater can not be discharged to the Lodi Wastewater treatment facility <br /> without pretreatment. Eu:tnermore, the wastewater treatment plant does not have any <br /> i additional treatment capacity for groundwater discharges to the sanitary sewer. Discussions <br /> with City of Lodi Public Works Department indicate that if the treated water is discharged to <br /> the storm sewer under a NPDES permit, the distance from the site to the nearest storm sewer <br /> =s is about 1,200 feet. Piping would reed to be installed from the GLDM site to the storm <br /> sewer to allow for the discharge of treated groundwater. <br /> �x Prior to discharge of effluent from the treatment system to the storm sewer system, a <br /> NPDES permit must be obtained from the RWQCB. Effluent limitations specified in the <br /> r NPDES permit are based on State and U.S. Environmental Protection Agency (EPA)plans <br /> i <br /> ically achievable tBATEA), and best <br /> and policies, best available treatment econom <br /> i <br /> 1� <br />