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North County Recycling Center and Sanitary Landfill Monitoring Implementation Plan Page 15 Table 4.1.10 – Description of Sampling Points Sampling Point Sampling Location Area Drained Type Type of Sampling Required SW-1 Representative upstream location. Run-on or direct rainfall Run-on WDR only or when there is evidence that it is impacting storm water quality SW-3 ISB Discharge Pipe / Culvert to intermediate stream 181 Acres; Runoff from the recycling center, the maintenance building, green waste area, landfill operations, bin storage area, and most of the landfill roadways. Runoff General Permit, Sub- chapter N ELGs, and WDR SW-4 Storm Water Retention Pond North of the NW Culvert 9.3 Acres; Runoff from covered and vegetated areas of Landfill Modules M1, M3, and M4. Runoff from west perimeter roadways. Runoff General Permit and WDR The RWQCB requires the results of WDR storm water monitoring to be summarized in the monitoring reports specified by the Order. If there is no discharge from the site during the monitoring period, or the County did not obtain samples of the discharge, the County is required to specify the reasons and circumstances in the monitoring report. WDR-Required Surface Water Monitoring: Surface water monitoring of the intermediate stream feeding into South Paddy Creek shall be conducted for the field parameters and the “semiannual” monitoring parameters listed in “Table F.3.c.”, except for Redox potential. Creek elevation may be estimated based on observation. Samples shall be collected at points SW-1 and S-2 immediately upstream and downstream of the landfill, as shown on SWPPP Map 2. 4.2 Sample Procedures In order to provide effective sample management, San Joaquin County uses the following sample management procedures that are derived from federal and state hazardous waste regulations and guidance materials. Appendix F provides a summary of sampling procedures. 4.2.1 Sample Preservation and Storage Sample preservation is dependent on the specific analyses that are to be performed. Each sample is to be collected in sample containers provided by the laboratory. The required analyses call for different preservation techniques. For example, the pH of the samples taken for the Oil and Grease analysis must be lowered to less than 2 with sulfuric acid (H2SO4). For some parameters, such as TSS, the only preservation technique required is refrigeration. The laboratory provides the proper containers with the appropriate preservatives already added to the containers. Measurement of pH may be field-tested; performed by the sampler, using a