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I j Michelle Price, City of Stockton April 22, 2013 i Application to Discharge Extracted Groundwater to the Sanitary Sewer Barnes Trucking, Stockton, CA Page 2 groundwater in the knockout tank will be routed to two 1 ,000-]b carbon vessels, in series, using the 2-hp transfer pump in-built on the DPE system. The treated water will be routed to a 20;000 gallon holding tank for storage to allow for testing prior to discharging the treated water to the sewer clean out. The location of the sewer cleanout is shown on Figure 2. Manufacturer's specifications for the remediation equipment are included in Appendix B. EXTRACTION AND DISCHARGE RATES During this DPE test, based on system specifications and proposed mass removal event duration, Stratus estimates approximately 20,000 to 40,000 gallons of groundwater will be extracted from the wells (which will include wells DPW4 , MW-5B, MW-9, and MW- 10 that contain the highest levels of contaminants beneath the site) for a one time discharge (average extraction rate over the 1 -week test duration is anticipated to range between 5 gallons per minute [gpm] and 15 gpm). Stratus proposes to use two 1 ,000-pound carbon units, in series, to treat the extracted groundwater. Based on current concentrations of the petroleum hydrocarbons in the groundwater (Appendix C) and the rate of carbon usage that we have observed at various carbon based groundwater treatment systems that we oversee, Stratus believes that two 1 ,000 lb carbon vessels are adequate to treat the estimated 20,000 to 40,000 gallons of water. To quantify the carbon utilization rate, Stratus proposes to collect three water samples, three times during the event, including an influent water sample, a water sample after the first carbon vessel (midfluent), and an effluent water sample (after the second carbons . A water meter willbe msta led to record total flow and the operational flowrate. SAMPLING AND REPORTING PROTOCOL The treatment system will be monitored once upon start-up, mid-week, and at the end of the test. Prior to start-up, performance evaluation sample ports will be installed prior to the primary carbon vessel (influent), between the primary and secondary vessels (midfluent), and after the secondary vessel (effluent). Upon start-up, Stratus proposes to collect the first set of influent, midfluent, and effluent samples after treating approximately 508 gallons of extracted groundwater (approximate volume of water in a carbon vessel is 254 gallons). The groundwater samples will be analyzed for gasoline range organics (GRO) and diesel range organics (DRO) using United States Environmental Protection Agency (USEPA) Method SW8015B/SW8260B, for benzene, toluene, ethylbenzene, and xylenes (BTEX) and methyl tertiary butyl ether (MTBE) using USEPA Method SW8260B, and for lead using USEPA Method 200. 8 , and will also be field monitored for pH levels. KABames Tracking\Correspondence\Bames Wastewater discharge permit app.doc