12 2026 02 12 Crestmont CC Stormwater Management Report

DOWNSPOUTS ARE INSTALLED ON THE BUILDING. SITEWORK CONTRACTOR SHALL BE RESPONSIBLE FOR ALL WORK INCLUDING THE RODENT SCREEN. BUILDING CONTRACTOR SHALL BE RESPONSIBLE FOR THE CONNECTION AT THE POINT OF THE RODENT SCREEN. 4. IF NECESSARY, ADJUST FOOTING TO ALLOW DOWNSPOUT TO BE INSTALLED TIGHT AGAINST BUILDING 12"(30cm) 4"(10cm) 1. Prepare soil before installing rolled erosion control 2/12/2026

2/12/2026 products (RECPs), including any necessary application 6" of lime, fertilizer, and seed. 6" (15cm) 4"(10cm) 2. Begin at the top of the channel by anchoring the (15cm) RECPs in a 6"(15cm) deep X 6"(15cm) wide trench with approximately 12"(30cm) of RECPs extended beyond 5 the up-slope portion of the trench. Use ShoreMax mat 2 7 at the channel/culvert outlet as supplemental scour 6" protection as

6" protection as needed. Anchor the RECPs with a row of (15cm) staples/stakes approximately 12"(30cm) apart in the 2"-5" bottom of the trench. Backfill and compact the trench (5-12.5cm) after stapling. Apply seed to the compacted soil and fold the remaining 12"(30cm) portion of RECPs back over the seed and compacted soil. Secure RECPs over compacted soil with a row of staples/stakes spaced 4"-6" (10-15cm) 3 approximately 12" apart across the width of the RECPs.

Langan Engineering and 3. Roll center RECPs in direction of water flow in bottom of channel. RECPs will unroll with appropriate side Environmental Services, LLC 6 against the soil surface. All RECPs must be securely fastened to soil surface by placing staples/stakes in appropriate locations as shown in the staple pattern 300 Kimball Drive 4

300 Kimball Drive 4 guide. 4. Place consecutive RECPs end-over-end (Shingle style) Parsippany, NJ 07054 with a 4"-6" overlap. Use a double row of staples staggered 4" apart and 4" on center to secure RECPs. 1 5. Full length edge of RECPs at top of side slopes must be anchored with a row of staples/stakes approximately T: 973.560.4900 F: 973.560.4901 www.langan.com 2"-5" 2"-5" (5-12.5cm) E (5-12.5cm) 12"(30cm) apart in a 6"(15cm) deep X 6"(15cm) wide

12"(30cm) apart in a 6"(15cm) deep X 6"(15cm) wide NJ Certificate of Authorization No. 24GA27996400 trench. Backfill and compact the trench after stapling. 6" 6. Adjacent RECPs must be overlapped approximately 2' 10" (15cm) 2"-5" (5-12.5cm) (Depending on RECPs type) and (0.6m) (25cm) stapled. 4' 7. In high flow channel applications a staple check slot is (1.2m) 8 recommended at 30 to 40 foot (9 -12m) intervals. Use a 20"(0.5m) double row of staples staggered 4"(10cm) apart and NOTES: 4"(10cm) on center over entire width of the channel. CRITICAL POINTS 10"(25cm)

4"(10cm) on center over entire width of the channel. CRITICAL POINTS 10"(25cm) *Horizontal staple spacing should be 8. The terminal end of the RECPs must be anchored with A. Overlaps and Seams B. Projected Water Line altered if necessary to allow staples to a row of staples/stakes approximately 12" (30cm) apart C. Channel Bottom/Side Slope Vertices secure the critical points along the in a 6"(15cm) deep X 6"(15cm) wide trench. Backfill 3.3' channel surface. and compact the trench after stapling. A A (1m) B B C C **In loose soil conditions, the use of staple or stake lengths greater than 6"(15cm) may be necessary to properly secure the RECP's. 3.75 Staples per SQ.YD.

properly secure the RECP's. 3.75 Staples per SQ.YD. © 2024 Langan Date: 3/4/2026 Time: 18:16 User: tgreen Style Table: Langan.stb Layout: CG501 Document Code: 101049802-0102-CG501-0101

EXISTING GRADE TYPE B INLET TYPE E INLET BOTTOM OF RAIN GARDEN SHALL BE A MINIMUM 12" ABOVE THE SEASONAL HIGH GROUNDWATER TABLE SHWT EL. N.T.S. 2/12/2026 Langan Engineering and Environmental Services, LLC 300 Kimball Drive Parsippany, NJ 07054 T: 973.560.4900 F: 973.560.4901 www.langan.com VARIES NJ Certificate of Authorization No. 24GA27996400 CLASS "A" CONCRETE DUMP NO WASTE DRAINS TO RIVER © 2024 Langan Date: 3/4/2026 Time: 18:16 User: tgreen

© 2024 Langan Date: 3/4/2026 Time: 18:16 User: tgreen Style Table: Langan.stb Layout: CG502 Document Code: 101049802-0102-CG501-0102