SITE INFORMATION AND CORRESPONDENCE

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• Trimark - 3 - 22 July 2004 ChevronTexaco Mountain House Creek Project ADDITIONAL REQUIREMENTS 1. The project shall be constructed and operated in accordance with the requirements contained in the Order and in accordance with the information submitted in the RWD and attachment dated 7 June 2004, and supplemental information dated 2 July 2004. In accordance with the Order, the MRP will be implemented at the time the treatment systems are operational. 2. For this project, the sampling and analysis of influent and effluent wastewater for lead (total and organic), methyl tertiary butyl ether (MTBE), methanol, ethanol, tertiary butyl alcohol (TBA), di- isopropyl ether (DIPE), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether(TAME), 1, 2-dichlo ro ethane (1, 2,-DCA), and 1, 2-dibromoethane (EDB) is waived unless otherwise directed by the Executive Officer. 3. Total petroleum hydrocarbon as diesel (TPH-d), as gasoline (TPH-g) benzene, toluene, ethylbenzene, anixylene (BTEX), naphthalene, polynuclear aromatic hydrocarbons (PAHs), specific conductivity (EC), total dissolved solids (TDS), nitrite (NOA nitrate (NO3), and general minerals (boron, calcium, hardness [as CaC031, iron, magnesium, manganese, potassium, sodium, chloride, sulfate, phosphate, alkalinity [as CaC031, and bicarbonate [as CaCO3]) shall be analyzed in the influent samples daily for the first three days of treatment and weekly for three consecutive weeks; subsequent sampling frequency shall follow the MRP sampling schedule thereafter. The PAHs will be analyzed by EPA Method 8310/8270 SIM, whichever provides the most complete list of PAH constituents having method detection limits (MDLs) equal to or less than that listed in Attachment A of the MRP. 4. Effluent samples from the treatment system shall be analyzed for the constituents listed in Item # 3 above and pH. In addition, flow rates (gallons per day and cumulative total gallons _ discharged) shall be recorded for the effluent. The flow rate information shall be tabulated for the effluent discharge point and reported with the analytical results. 5. Groundwater monitoring wells, MW-1 through MW-4, located in Field G shall be monitored and sampled as described in a 17 June 2004 letter from Regional Board staff to Trimark and ChevronTexaco. 6. An annual fee - $1,800 (as specified in the annual billing invoice issued by the State Water Resource Control Board) shall be required until this Notice of Applicability is officially revoked. 7. The discharge of wastes other than treated groundwater from the construction dewatering wells and cleanup of crude oil pollution, or discharge of other contaminants, is prohibited. Based on our review of the information provided, we have determined the project/process meets the required conditions of the Order. All requirements contained in the Order are applicable to the Mountain House Creek Bridge Construction and Streambed Alteration Project. You are hereby assigned General Order No. R5-2003-004414 to regulate the discharge of treated groundwater from Mountain House Creek Bridge Construction and Streambed Alteration Project Land Discharge Point described above and depicted on the attached Figures.