SITE INFORMATION AND CORRESPONDENCE

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MONITORING AND REPORTING PROGRAM -4- SIMPSON INVESTMENT COMPANY SIMPSON PAPER COMPANY RIPON MILL SAN JOAQUIN COUNTY The exposed portion of the surface impoundment shall be inspected monthly. Monthly inspection reports shall be submitted with quarterly monitoring reports and shall include a description of the condition of the wastewater management facilities and any changes in appearance from the previous month. GROUND WATER MONITORING The water level in each monitoring well shall be measured quarterly. Data from water level measurements shall be used to construct ground water contour maps showing the direction of ground water flow in the aquifer beneath the Ripon Mill property. Ground water contour maps shall be submitted with the quarterly monitoring reports. Contour maps shall be constructed using feet above mean sea level . The ground water monitoring program should include cluster Wells TH-5, TH-6, TH- 7, TH-8, OB-1 , and OB-17 and Wells TH-1 , TH-2, TH-4, Well 4, M11C, OB-2, OB-5, OB-13, and OB-17. Ground water at each monitoring well shall be analyzed for pH, Electrical Conductivity, water level (above mean sea level ) , and turbidity in the field. Quarterly laboratory tests shall be made on samples from each well . Parameters to be tested are: Total Dissolved Solids (TDS) , chloride, sulfate, nitrate and sodium. All laboratory parameters shall be reported in milligrams per liter. Field and laboratory tests shall be reported in the quarterly monitoring report. Electrical Conductivity results shall be submitted on a site contour map. All parameters shall be graphed so as to show historical trends at each well . Prior to construction, plans and specifications for additional ground water monitoring wells shall be submitted to Board staff for review and approval . The Discharger shall implement the above monitoring program as of the date of this Order. WILLIAM H. CROOKS, Executive Officer (Date) RAE:lsb:5/11/93