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MONITORING AND REPORTING PROGRAM -4- PAT 4- PAT MITCHELL AND CALIFORNIA NATURAL PRODUCTS WASTEWATER TREATMENT AND DISPOSAL FACILITY SAN JOAQUIN COUNTY by May I") and may be combined with the monthly report. The Quarterly Report shall include the following: 1. A narrative description of all preparatory, monitoring, sampling, and analytical testing activities for the groundwater monitoring. The narrative shall be sufficiently detailed to verify compliance with the WDR, this MRP, and the Standard Provisions and Reporting Requirements. The narrative shall be supported by field logs for each well documenting depth to groundwater; parameters measured before, during, and after purging; method of purging; calculation of casing volume; and total volume of water purged. 2. Calculation of groundwater elevations, an assessment of groundwater flow direction and gradient on the date of measurement, comparison of previous flow direction and gradient data, and discussion of seasonal trends if any. 3. A statistical analysis of data using one of the methods described in §20415(e)(8)(A)-(E) of Title 27. A non-statistical data analysis method can be used if the method can achieve the goal of the particular monitoring program at least as well as the most appropriate statistical method [27 CCR §20415(e)(8)]. The Discharger shall use a statistical or nonstatistical data analysis method that complies with §20415(e)(7, 8, 9, and 10) of Title 27, to compare the downgradient concentration of each constituent of concern or monitoring parameter with its respective background concentration to determine whether there has been a"measurably significant" evidence of an impact to the groundwater. For any monitoring point at which a constituent has already exhibited a measurably significant indication of a release or an impact, the Discharger may propose to monitor the constituent, at that well, using a concentration-versus-time plot. If, during any quarterly data evaluation, the Discharger confirms a statistically significant evidence of an increase in a waste constituent in groundwater at monitoring wells compared to background levels (or other groundwater limitations),the Discharger shall conclude that it is in violation of waste discharge requirements unless it can demonstrate an offsite source. The Discharger shall submit confirmation of violation in a written report pursuant to Standard Provision B.1. 4. A narrative discussion of the analytical results for all media and locations monitored including spatial and temporal tends, with reference to summary data tables, graphs, and appended analytical reports (as applicable). 5. A comparison of monitoring data to the discharge specifications, groundwater limitations, and an explanation of any violation of those requirements. 6. Summary data tables of historical and current water table elevations and analytical results. 7. A scaled map showing relevant structures and features of the facility, the locations of monitoring wells and any other sampling stations, and groundwater elevation contours referenced to mean sea level datum. 8. Copies of laboratory analytical report(s) for groundwater.