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F7Theconventional septic tank to serve the ARCO Service Station facility is an H-20 traffic rated o compartment tank, also with a Polylok PL-250 Effluent Filter at the sanitary tee yt flow volumes from the Restaurant and ARCO Station will combine into the first of two, 2,000 gallon,two compartment conventional, non-traffic rated septic tanks. These two tanks are not traffic rated because they are to be installed in a planter surrounding a trash enclosure area and will be readily accessible for sampling and inspection. It is unlikely these two tanks will require pumping. The second compartment of the second polishing tank will contain the Orenco BioTube filter vault and pumps to pressurize the treated effluent to the disposal area laterals for equal distribution. The BioTube Part No. is PVU68-1819. Inside the pump vault will be a duplex high-head pump system, Part No. P17751012, 75 gpm, I HP, 230V,, 60 Hz. The control panel for the pump system operation can be located on the outside of the block masonry trash enclosure. Part No. for the control panel is MVP-DAX2DM. IV. PACKAGE TREATMENT PLANT The Package Treatment Plant (PTP) originally anticipated to be installed for this project has been suspended until after complete build-out of the project occurs, at which time analyses of the complete-mix waste stream effluent can be qualitatively quantified. The waste stream constituent concentrations after the complete build-out are expected to be considerably less than initially measured in the Restaurant's effluent. This is particularly regarding the concentrations of BODS and TSS. This anticipated decrease in effluent constituent concentrations is based upon the design and operational parameters described in this document. These include: 1.) Strict scraping and capture of all oils, grease and food products which are to be handled as solid wastes before introduction into the septic treatment and disposal system, 2.) Properly sized tankage, 3.) Filtration of effluent exiting the tankage, and 4.) Two large capacity polishing tanks, with the second polishing tank also a surge tank. If it is ultimately determined that the combined effluent from the Restaurant and ARCO Station requires further treatment,there is sufficient area to install a PTP. The required area to install the PTP is approximately 200 sq. ft. In addition to the anticipated decreases in BODS and TSS concentrations, the Nitrate Loading Study will theoretically demonstrate that the nitrate loading will be under the Maximum Contaminant Level, provided the nitrogen concentrations are reduced by the Restaurant procedures noted above and after septic tank treatment. Therefore, based upon the loading calculations, advanced treatment to reduce nitrogen in the effluent by a PTP may not be required. Page 5 of 8 Chesney Consulting