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3.2 Calculate the infiltration rate for each 15-minute interval (change in depth at each <br /> interval x 4) and record the results in the table below. <br /> Time of * Depth to Infiltration <br /> Measure Water Level Rate <br /> (15-min. interval) (inches) (in/hr) <br /> I 140 4 - <br /> 1-3f 3,4 <br /> I o Ve4- S„5 <br /> 4. Check for high groundwater/immediate groundwater mounding: <br /> 4.1 Within 24 hours after the falling head period, excavate the bottocgthe pit. <br /> 4.2 Is standing water or seepage visible in excavated hole? (Yes No <br /> 4.3 If yes", record depth : ft. <br /> 5. Data Analysis/"Measured Infiltration Rate" Selection (use the falling head data to confirm <br /> the measured infiltration rate calculated from the steady-state data): <br /> 5.1 Steady-state measured infiltration rate: Provide the lowest infiltration rate from steady- <br /> state table above: -3.11 in/hr. <br /> 5.2 Select"Measured Infiltration Rate": 3.2. in/hr <br /> 5.3 If the lowest measured infiltration rate is less than the minimum rate associated with <br /> an infiltration BMP, that BMP cannot be used. <br /> 5.4 If the measured infiltration rate is less than all minimum infiltration rates for infiltration <br /> BMPs, no further investigation is required. <br /> 6. Calculate"Design Infiltration Rate": The design infiltration rate shall be calculated by applying <br /> the appropriate correction factor to the above measured infiltration rate. <br /> 6.1 Select a correction factor. <br /> Site variability and number of locations tested, CF,= O. C5 <br /> Uncertainty of test method, CFt= 0 <br /> Degree of influent control to prevent siltation and bio-buildup, CFm 0 ct <br /> Total correction factor= CFv x CFt x CFm = 0 .71 <br /> 6.2 Calculate the Design Infiltration Rate below: <br /> Design Infiltration Rate= 4.Zetx 3i = 0.q3 in/hr <br /> Infiltration Test performed by: Print Name 4@ii, 7. ILI <br /> Signature 11111Wilp Date B12-3124M1 <br /> — <br /> Company 1,„:' ,,, t 114 <br />