7800 EVERGREEN WAY HYUNDAI 2025-08-05

LMJ Enterprises, LP March 31, 2022 Page 4 Measured Infiltration Rate A plot of the apparent short-term infiltration rate calculated during each stage of the PIT is presented in Figure 3. The field measured infiltration rate was higher during the initial stage of the test as additional water was required to fill the pore space of the initially unsaturated soils until it approaches full saturation toward the end of the test. In PIT-1, there was very little infiltration during the 7-hour testing period. The PIT only required one refill duringthe testing period. The infiltration rate was calculated duringtwo stages over the entire test duration. The field measured infiltration rate duringthe testingstage was 0.41 inches per hour in PIT-1. Design Infiltration Rate The measured infiltration rate and the recommended design infiltration rate for use in design are summarized in Table 1. TABLE 1. MEASURED AND RECOMMENDED DESIGN INFILTRATION RATE Measured Infiltration Rate Design Infiltration Location (ini Rate (ini PIT-1 0.41 0.15 The design infiltration rate is determined by applying correction factors to the measured infiltration rate. The correction factors accountfor uncertainties in site variability and number of tests, testing method, and long-term reductions in permeability due to plugging from biological activity and accumulation of fines. Table III-3.3.1 of the 2019 SWMMWW describes the correction factors to be used to estimate design infiltration rates. Table 111.3.3.1 Correction Factors to be Used With In -Situ Saturated Hvdraulic Conductivity Measurements to Estimate Design Rates Issue Partial Correction Facto Site variability and number of locations tested CF = 0.33 to 1.0 Test Method . Large-scale PIT . CFt=0.75 . Small-scale PIT . =0.50 . Other small-scale (e.g. Double ring, falling head) . = 0.40 . Grain Size Method • = 0.40 Degree of influent control to prevent siltation and bio-buildup CF= 0.9 Total Correction Factor, CFT = CFv x CFtx CFm ■ CF accounts for site variability and number of locations tested. A CF of 0.8 was used for the analyses. ■ CFt is determined based on the test method. The CFt for small-scale PIT testing is 0.5. ■ CFR, accounts for the degree of influent control to prevent siltation and bio-buildup and is 0.9. The total correction factor CFT for the PITs is 0.36. When applied to the measured infiltration rate of 0.41 inches per hour, the design infiltration rate for PIT-1 is 0.15. GEOENGINEER� File No. 24459 003 00