You are provided the mechanical sieve/hydrometer and Atterberg Limit test results for three soils, labeled as Soil #1, Soil #2, and Soil #3. The mechanical sieve results are shown in Figure 1, while Table 2 presents the Atterberg Limit test results. Classify the soils in accordance with the Unified Soil Classification System (USCS) and AASHTO.**Figure 1: Mechanical Sieve and Hydrometer Results for Problem #2.**The graph in Figure 1 illustrates the percent passing (by weight) for three different soils (Soil #1, Soil #2, and Soil #3) across a range of grain sizes from 0.0001 mm to 10 mm. The key points are:- The x-axis represents the grain size in millimeters, presented on a logarithmic scale.- The y-axis indicates the percent passing (by weight).- The vertical orange line at 0.075 mm marks the boundary between silt and sand sizes.- Soil #3 (blue line) shows a curve with a steep rise, indicating it's mostly sand and gravel.- Soil #2 (magenta line) shows a moderate trend with a significant portion in the sand range.- Soil #1 (cyan line) shows a gradual increase, indicating a higher proportion of clay-sized particles.**Table 2: Atterberg Limits (ASTM D4318) for Problem #2.**| Soil | LL | PL ||------|-----|-----|| #1 | 68 | 19 || #2 | 39 | 31 || #3 | NA | NA |- **LL** stands for Liquid Limit.- **PL** refers to Plastic Limit.- Soil #1 has a Liquid Limit of 68 and a Plastic Limit of 19.- Soil #2 has a Liquid Limit of 39 and a Plastic Limit of 31.- Atterberg Limits are not applicable (NA) for Soil #3. Use the data provided to classify the soils according to USCS and AASHTO standards.

Given: Soil LL PL 1 68 19 2 39 31 3 NA NA To find: The soil classification with the Unified soil classification system (USCS) The soil classification with the AASHTO soil classification system.Unified soil classification system (USCS): Soil 1: Soil is coarse-grained: more than 50% of the soil is retained on a 0.075mm sieve. The soil which is more than 50% of the coarse particles is retained on the 4.75mm sieve else it is sand. From the plasticity chart: For LL =68 & PI = 68-19=49 The Atterberg limit plot above A-line and also the plasticity index greater than 7 Therefore the soil is classified as SC Sand Plastic fines. Soil 2: Soil is fine-grained: more than 50% of the soil passes through a 0.075mm sieve. The liquid limit of the soil is less than 50, it is grouped in the soil with a low plasticity group For LL =39 & PI = 39-31=8 The Atterberg limit plot below A-line and LL by 30% or even more, the soil is organic. Therefore the soil is classified as OL Organic Low plasticity Soil 3: Since LL and PL values are not applicable, the sample is Highly organic soil Therefore the soil is classified as Peat (Pt)Soil 1: The material passing 0.075 mm sieve is 35 % or less LL = 68 > 41 PI = 49> 11 Therefore the soil is classified as A-2-7 Soil 2: The material passing 0.075 mm sieve is more than 35 % LL=39 < 40 PI = 8 <10 Therefore the soil is classified as A-4. Soil 3. Since the sample is passing 0.075 mm sieve fully Therefore it cannot be classified on the AASHTO. Hence it is Highly clay.Answer: Soil LL PL USCS AASHTO 1 68 19 SC A-2-7 2 39 31 OL A-4 3 NA NA Peat Highly clay