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i WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2003-0165 2 SUPPORT TERMINALS OPERATING PARTNERSHIP,LP STOCKTON TERMINAL ENHANCED BIOREMEDIATION PILOT STUDY SAN JOAQUIN COUNTY 6. The proposed system will extract groundwater from two extraction wells screened in the A water bearing zone downgradient of the treatment area, as shown on Attachment B,which is attached hereto and made part of this Order by reference. The extracted groundwater will be piped to a 300-gallon storage tank at the upgradient end of the treatment area.The Discharger will add a bacterial consortium, enzyme enhancements, and specialized nutrients to the 300-gallon storage tank. Amended groundwater will then be re-injected back into the A water bearing zone upgradient of the treatment area via the Super Ox TM unit. Extracting groundwater at the downgradient end of the treatment area along with the natural groundwater flow direction will pull the amended groundwater through the treatment area. 7. The bacterial consortium is "PetroZyme" which is a proprietary product supplied by Enzyme Technologies that contains microbes (Multi-Enzyme Complexes and Total Petroleum Hydrocarbon Bacterial Consortium)that produce enzymes. These enzymes cause a chemical change without undergoing any change themselves and are capable of catalyzing the breakdown of petroleum hydrocarbons. The groundwater will also be amended with nitrogen, phosphorus and potassium in a nutrient mix called NutriMax, also supplied by Enzyme Technologies, in an effort to support bacterial cell growth. Based on stoichiometric relationships between nitrogen, phosphorous and potassiuim, the uptake ratio is 100:10:1. Therefore, NutriMax is about 30 percent nitrogen, three percent phosphorus, and 0.3 percent potassium. The remaining percentage is hydrogen and oxygen that is present in the compounds that make up NutriMax. 8. The Discharger proposes to inject 50 gallons of PetroZyme and 25 pounds of NutriMax for the initial inoculation. After one month of operation,the Discharger will add 10 gallons of PetroZyme and 25 pounds of NutriMax on a monthly basis for the following five months. The Discharger estimates these amounts based on the calculated petroleum hydrocarbon mass determined from previous investigations. The pollutant breakdown process may produce tert-butyl alcohol and acetone,but because the microbial process is continuous, any intermediate degradation products will be broken down to carbon dioxide and water. No nutrient concentrations will remain in the subsurface because the nutrient addition rate will match the microbial nutrient uptake rate. Bench-scale testing has not been performed because Multi-Enzyme Complexes and Total Petroleum Hydrocarbon Bacterial Consortium have both been used at numerous sites and the microbes have shown the ability to degrade petroleum hydrocarbons. These microbes degrade petroleum hydrocarbons through natural biological processes and do not create reaction or byproducts. 9. The Super Ox TM oxygenation system takes the amended stream of water, oxygenates it to about 45 parts per million of dissolved oxygen, and injects it into the subsurface. The enzyme-catalyzed dissolved oxygen in situ treatment system is not expected to change hydraulic characteristics of the aquifer(i.e.,clogging)based on the low extraction and injection rates. The Discharger proposes a total extraction and injection rate between one