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MONITORING AND REPORTING PROGRAM -3- SOUTHWEST HIDE COMPANY SURFACE IMPOUNDMENT CLOSURE SAN JOAQUIN COUNTY PROPOSED GROUND WATER AND VADOSE ZONE PORE FLUID MONITORING PROGRAM The Discharger shall submit by 1 July 1992, a proposed revised ground water and vadose zone pore fluid monitoring system and program in accordance with Article 5 of Chapter 15. The water quality monitoring system and program shall be sufficient to demonstrate compliance, or lack thereof, with the Water Quality Protection Standard. Existing water quality monitoring stations and data can be proposed for incorporation in the revised monitoring system and program. The proposal shall include: 1 . Proposed conceptual design Ad location of water quality monitoring points including those at the point of compliance (§2550.7) ; 2. Proposed monitoring parameters, constituents of concern, and their monitoring frequencies (§2550.7 and §2550.8) ; 3. Proposed concentration limits and/or methods for establishing concentration limits (§2550.4) ; and, 4. Proposed statistical methods for determining statistically significant evidence for a release from surface impoundments. Ground Water Monitoring The existing ground water monitoring system consists of twenty monitoring wells. The Discharger shall continue to monitor these wells for the constituents and parameters specified below at the specified frequency until the Discharger's revised monitoring program is approved by the Board and the monitoring system is operational . Report in Reporting and Parameter/Constituent Units of Sampling Frequency Temperature °C Quarterly Turbidity N.T.U. Quarterly Specific Conductance (field) µmhos/cm Quarterly pH (field) pH units Quarterly Total Dissolved Solids mg/1 Quarterly Chloride mg/l Quarterly Sulfate mg/l Quarterly