Stormwater Management Report 03302026

Client: Gomes Management Project: 525 Northfield Avenue, West Orange, NJ Page: 3 Date: 09/03/2024 Soil Boring Soil Sample Depth Moisture Fines thru USCS Number No. collected Content (%) #200 Sieve Symbol B-1 S-1 2'- 4' 10.9 31.1 GM B-2A S-2 4' - 6' 10.1 19.1 SM B-3 S-3 6'- 8' S.5 1.9 GP B-4 S-4 8'- 10' 8.2 21.0 GM B-5A S-5 10'- 12' 5.8 24.7 SM B-6 S-6 15'- 17' 13.3 28.8 SM B-7 S-7 4'- 6' 7.5 23.7 SM B-8 S-8 6'- 8' 14.2 26.3 SM GM: silty gravels SM: silty sands GP: poorly graded gravels SUBSURFACE CONDITIONS: Detailed description of the soil encountered in the test boring is documented in the boring log which is presented in Appendix-A. The following gives a general description of the subsurface conditions encountered at the borings. While the borings may indicate that the subsurface conditions appear to be relatively uniform across the site, it should be recognized that the size of borings was small compared to the size of the site, and that the existence of anomalies cannot be precluded. According to NJ Geoweb website, the geological formation is Rahway Till and geologic age is late Pleistocene, late Wisconsinan deposited directly from glacial ice during the late Wisconsinan glaciation. It consits of clayey silt to sandy silt with some to many pebbles and cobbles and few boulders; reddish brown, reddish yellow, yellowish brown, brown. As much as 100 feet thick, generally less than 40 feet thick. Based on the results of soil borings and our

d few boulders; reddish brown, reddish yellow, yellowish brown, brown. As much as 100 feet thick, generally less than 40 feet thick. Based on the results of soil borings and our geo-technical laboratory testing, we estimate the general stratigraphy of the site to consist of the following major units, in an increasing order of depth. Stratum-1: Fill material containing very dark gray, brown/black silt, trace f/c sand, trace f/c gravel, trace wood chip, trace fragments of concrete, and fill material containing brown, black silty f/c sand, trace f/c gravel, trace fragments of asphalt &glass, plastic and fill material containing grayish brown f/c sand, trace silt, some f/c gray crushed stone and fill material containing dark gray, greenish gray clayey silt, trace f/c sand, trace fine gravel, trace fragments of asphalt was noted under this stratum in top 2'-6" in boring B-1, in top 4' in B-2/2A, in top 4'-11" in B-3, in top 5" in B-4, in top 2' in B-5/5A and in top 9" in B-8. No fill was noted in boring B-6 & B-7. The relative density of this material varied between loose to medium dense condition. The relative stiffness of this material varied between soft to medium stiff condition. Stratum-2: Brown silt, trace f/c sand, reddish brown silty f/c sand & f/c gravel, trace silt and reddish brown silt, trace f/c sand, trace f/m gravel was noted under this stratum between 4 feet to spoon refusal @ 4'-3" in boring B-1, between 10 feet to spoon refusal @ 10'-9" in boring B- 2/2A, between 2 feet to 4 feet &then between 6 feet to 10 feet in B-4, between 4 feet to down to spoon refusal @ 15'-3" in B-5/5A, between 2 feet to down to spoon refusal @ 25'-7" in B- 6, down to 12 feet in B-7, between 2 feet to 11 feet &then between 15 feet to 17 feet in B-8. The relative density of this material varied between very loose to very dense condition. The relative stiffness of this material varied between soft to stiff condition.