SITE INFORMATION AND CORRESPONDENCE

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0 REVISED MONITORING AND REPORTING PROGRAM NO. R5-2 - _ - 003 U050 2 IMPERIAL HOLLY CORPORATION HOLLY SUGAR CORPORATION dba SPRECKELS SUGAR COMPANY SPRECKELS SUGAR COMPANY TRACY FACILITY SAN JOAQUIN COUNTY GROUNDWATER MONITORING The Discharger shall sample groundwater at shallow background groundwater wells: BW-2, WP- 1, WP-2, and WP-6; at shallow groundwater monitoring wells WP-3, -4, -5, -8, at deep background groundwater well BW-4 and at deep groundwater monitoring wells BW-3, WP-7. The Discharger shall collect samples from the groundwater wells as specified in Table 1. Sample collection shall follow standard EPA protocol. TABL771 - G7ROUNDWATER MONITORING PROGRAM F__ eter Units Frequency Field Parameters Groundwater Elevation Feet(100ths), MSL Semi-Annually Specific Conductance µmhos/cm Semi-Annually pH Number Semi-Annually Turbidity Turbidity Units Semi-Annually Monitoring Parameters Ammonia mg/1 Semi-Annually Bicarbonate as CaCO3 mg/l Semi-Annually Calcium mg/l Semi-Annually Chloride mg/1 Semi-Amlually Nitrate-N mg/1 Semi-Annually Hardness as CaCO3 mg/l Semi-Annually Potassium mg/1 Semi-Annually Sodium mg/1 Semi-Annually Sulfate mg/l Semi-Annually Total Dissolved Solids .mg/1 Semi-Annually Total Fixed Dissolved Solids mg/l Semi-Annually Total Organic Carbon mg/l Semi-Annually The Discharger shall measure the water level in each monitoring well (in feet and hundredths, MSL) and determine groundwater gradient and direction at least semi-annually, including the times of expected highest and lowest water level elevations for the respective groundwater body. Groundwater elevations shall be measured for a given groundwater-body within a period of time short enough to avoid temporal groundwater flow variations which could preclude accurate determination of groundwater gradient and direction.