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MONITORING AND REPORTING PROGRAM NO. R5-2003-0044 _3- GENERAL ORDER FOR LAND DISPOSAL OF GROUNDWATER OR SURFACE WATER FROM CLEANUP OF PETROLEUM FUEL POLLUTION Type of Constituents Units Sample Fre uencv MtBE �tg/l Grab Monthly** Lead(total)* µg/l Grab Monthly** Lead (organic) µg/l Grab Monthly** Methanol µg/l Grab Monthly** Ethanol µg/1 Grab Monthly** Tertiary Butyl Alcohol (TBA) µg11 Grab Monthly** Di-isopropyl Ether(DIPS) gg/l Grab Monthly** Ethyl Tertiary Butyl Ether(ETBE) µg/I Grab Monthly** Tertiary Amyl Methyl Ether µg/l Grab Monthly** (TAME) 1,2-Dichloroethane (1,2-DCA) µg/l Grab Monthly*'� 1,2-Dibromoethane (EDB) µg/l Grab a Monthly** Naphthalene µg/l Grab Monthly" Polynuclear Aromatic Hydrocarbons µg/l Grab Monthly** * If lead is not detected in the first 2 sampling events, then testing maj be discontinued thereafter, upon approval by Regional Board staff. 1) Analyses shall be conducted weekly for four consecutive weeks following initial discharge from the treatment system. 2) If any sample shows detectable TPH, benzene, toluene, ethylbenzene, xylenes, Naphthalene, 1,2-Dichloroethane, 1,2-Dibromoethane, Polynuclear Aromatic Hydrocarbons, MtBE or other oxygenates, the Discharger shall immediately evaluate the treatment system, resample within three days of laboratory notification and reanalyze the effluent for the detected constituent(s), and shall continue sampling the effluent on a weekly basis until the constituent(s) concentrations are below permitted levels. Once four consecutive weeks are below permitted levels, monthly sampling may be initiated. 3) If a detectable concentration is determined to be present in wastewater, the frequency will revert back to weekly. 4) If a constituent is not present in the influent sample, then the testing for that constituent may be discontinued, upon approval by Regional Board staff, until detected in the influent. Appropriate quantitation (or reporting) limits are described in Part C.1 of this Order. GROUNDWATER MONITORING The groundwater monitoring program submitted with the Report of Waste Discharge and approved by the Executive Officer, shall constitute the groundwater monitoring program. Prior to construction, plans and specifications for groundwater monitoring wells and/or extraction wells shall be submitted to the Regional Board staff for review and approval.