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ATTACHMENT C— INFORMATION SHEET C-10 <br /> MODEL MONITORING AND REPORTING PROGRAM <br /> STATE WATER RESOURCES CONTROL BOARD <br /> ORDER WQ 2014-0153-DWQ <br /> GENERAL WASTE DISCHARGE REQUIREMENTS <br /> FOR SMALL DOMESTIC WASTEWATER TREATMENT SYSTEMS <br /> Prior to sampling, groundwater elevations shall be measured and the wells shall be purged of <br /> at least three well volumes and until pH and electrical conductivity have stabilized. No-purge, <br /> low-flow, or other sampling techniques are acceptable if they are described in an approved <br /> Sampling and Analysis Plan. Depth to groundwater shall be measured to the nearest 0.01 <br /> feet. Groundwater elevations shall be calculated. Samples shall be collected using approved <br /> USEPA methods. Groundwater monitoring shall include, at a minimum, the following: <br /> Sample Sampling/Reporting <br /> Constituent Units Type Frequency c,d <br /> Groundwater Elevation a 0.01 Feet Calculated Quarterly <br /> Depth to Groundwater 0.01 Feet Measurement Quarter) <br /> Gradient Feet/Feet Calculated Quarterly <br /> Gradient Direction degrees Calculated Quarter) <br /> pH Std. Units Grab Quarterly <br /> Total Dissolved Solids mg/L Grab Quarterly <br /> Nitrate as Nitrogen m /L Grab Quarter) <br /> Sodium mg/L Grab Quarterly <br /> Chloride m /L Grab Quarter) <br /> Total Coliform Organisms b MPN/100 mL Grab Quarterly <br /> Zinc ' m /L Grab Quarter) <br /> Phenol m /L Grab Quarter) <br /> Formaldehyde ° mg/L Grab Quarterly <br /> MPN/100 mL denotes most probable number per 100 mL sample. Std. Units denotes standard units. <br /> mg/L denotes milligrams per liter. <br /> a. Groundwater elevation shall be based on depth to water using a surveyed measuring point elevation on <br /> the well and a surveyed reference elevation. <br /> b. Using a minimum of 15 tubes or three dilutions. <br /> C. <br /> Monitoring of the constituents zinc, phenol, and formaldehyde are required only when recreational <br /> vehicles were allowed to discharge to the wastewater system in the previous 12 months. <br /> d. Analysis of data by a California licensed professional is required at least annually, <br /> SURFACE WATER MONITORING <br /> Because of the difficulty in monitoring bacteria in surface water, sample collection procedures <br /> must be described in a Sampling and Analysis Plan. Natural bacteria levels can vary <br /> significantly, and may be correlated with rainfall. When possible, surface water bacteria <br /> samples should be collected under dry weather conditions. It is critical when monitoring <br /> bacteria that all containers and surfaces a sample contacts are sterile. Sample containers <br /> must be autoclaved or manufactured to maintain sterility; use of screw top bottles, Whirl-pake <br /> bags, or similar containers is acceptable. The sample hold time for bacteria samples is <br /> typically no more than six hours. Monitoring shall include, at a minimum, the following: <br /> September 23, 2014 <br />