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-3- <br /> MONITORING AND REPORTING ORDER NO.R5-2017-0817 <br /> RAYMOND INVESTMENT COROPORATION - <br /> FORMER HELENA CHEMICAL FACILITY,SAN JOAQUIN COUNTY <br /> Monitoring Specifications <br /> 1. As shown on Figure 1, there are three groundwater monitoring wells designated <br /> MW-1, MW-2, and MW-3. The groundwater monitoring program for the three <br /> monitoring wells, and any wells installed subsequent to the issuance of this MRP, <br /> shall follow the schedule in Table 1. <br /> Table 1. Groundwater Monitoring Schedule' 2 <br /> Parameters/Constituents MWA MW-2 MW-3 <br /> De th to Groundwater Quarterl Quarterly Quarterl <br /> Nitrate, Nitrite as nitro en Quarterl Quarterl Quarterl <br /> 1,2,3-Trichloro ro ane Quarterl Quarterl Quarterl <br /> At a minimum, all newly installed wells shall be sampled quarterly until a reduced sampling frequency is approved <br /> 2 If monitoring consistently shows no significant variation in magnitude of constituent concentration after at least <br /> four monitoring events, Discharger may request a reduction in the monitoring frequency or request to eliminate <br /> monitoring for constituents that are not detected. <br /> 2. Groundwater elevation shall be recorded and field parameters such as electrical <br /> conductivity, dissolved oxygen, pH and temperature shall stabilize and be recorded <br /> prior to sample collection. <br /> 3. The Discharger shall analyze samples according to standard Environmental <br /> Protection Agency (EPA) protocol using the methods shown in Table 2. <br /> Table 2. Analytical Methods <br /> Parameters/Constituents Analytical Method Maximum ReportingLimit' <br /> Depth to Groundwater Field Measurement 0.1 feet <br /> Electrical Conductivity Field Meter 50 µS/Cm2 <br /> Dissolved Oxygen Field Meter 0.2 mg/L <br /> Temperature Field Meter 0.1°C <br /> H Field Meter 0.1 units <br /> Turbidity Field Meter NTU <br /> Nitrate plus Nitrite as nitrogen) EPA 300 or SM 4500 0.1 m /L <br /> 1,2,3-Trichloro ro ane SLR 524M 0.005 u /L <br /> If the maximum practical quantitation limit is exceeded for a non-detectable result,the Discharger shall provide an <br /> explanation in the report text.All concentrations between the Method Detection Limit and the Practical <br /> Quantitation Limit shall be reported as trace. <br />