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a. Sand filter effluent samples shall be collected at least yearly by the ORC. <br /> (1) Samples shall be collected from the sampling port/vent pipe located between the <br /> underdrain exit point and the drainfield. <br /> (2) The 4-way cross,P-trap,distribution box or similar device provided for effluent <br /> sampling shall be purged of accumulated effluent and allowed to refill prior to <br /> collecting a sample. <br /> b. Sample collection frequency shall be specified by the local health department in the Operation <br /> and Permit can be modified,as needed,by the local health department. <br /> C. All samples shall be obtained,preserved,and analyzed in accordance with 40 CFR 136. <br /> Samples shall be analyzed by a state certified wastewater laboratory for the treatment <br /> performance standards specified in Section B.1 or 2. <br /> d. For systems designed to meet TS-1I,septic tank effluent samples must be collected at the <br /> same time as the sand filter effluent samples. The sand filter effluent samples may be <br /> analyzed first and the septic tank effluent samples discarded if total nitrogen is less than 15 <br /> mgll. If the sand filter effluent total nitrogen is 15mg11 or more,the septic tank effluent <br /> samples must also analyzed for total nitrogen to determine compliance with TS-II <br /> requirements <br /> e. When samples do not meet treatment standards specified in Section B.I or 2,the system shall be <br /> re-sampled two more times within the next 60 days with samples collected no less than 48 hours <br /> apart. The average system performance shall then be calculated as the arithmetic mean <br /> (geometric mean for fecal coliforms)of results from the three samples. System maintenance or <br /> repair shall be required whenever the average system performance as calculated above does not <br /> meet the applicable treatment standards specified in Section B.1 or 2. <br /> 7.Notification and Performance of Maintenance and Repairs <br /> a. The ORC shall alert the system owner in a timely fashion of needed maintenance or repair activities <br /> including,but not limited to,landscaping,tank sealing,tank pumping,lateral pipe desludging,pipe or <br /> control system repairs,sand media replacement,and adjustments to any other system component. The <br /> ORC shall notify the system owner and local health department whenever the pump delivery rate efficiency <br /> or average pump run time are not within 25%of initial measurements conducted prior to system startup. <br /> b. The ORC shall keep the septic tank outlet filter or screened pump vault cleaned and in proper <br /> operating condition. <br /> C. System troubleshooting and needed maintenance(flushing lines etc.).must be provided to <br /> maintain the pump delivery rate efficiency and average pump run time within 25%of initial <br /> measurements conducted prior to system startup. <br /> d. The septic tank will be pumped as needed upon recommendation of the ORC. However,at a <br /> minimum the septic tank will be pumped whenever the solids level exceeds 25%of the tank's <br /> total liquid working capacity or the scum layer is more than 4 inches thick. <br /> e. The ORC shall notify the local Health Department and system owner in writing whenever repairs are <br /> required. All maintenance activities shall also be logged and recorded in the ORC reports <br /> provided to the local health department. <br /> 11 <br /> 135 <br />