ENGINEERING SERVICES PROVIDED

Site Planning & TxDOT Coordination

The site plan was developed to accommodate a large multi-row storage complex fronting the N. IH-35 Frontage Road, with primary access via a permitted TxDOT driveway apron. The proposed layout includes multiple parallel rows of storage buildings with internal drive aisles, a gravel area section per TxDOT Item 247, and coordination with the existing mail boxes and corrugated metal pipe culverts along Brickyard Road.

Design Components:

• Proposed site layout with 199 storage units

• TxDOT driveway apron plan per TxDOT standards

• ADA/TAS compliance summary for self-storage (TAS Chapter 4)

• Proposed drainage flowlines and internal drive aisle layout

• Proposed rock riprap (D50 – 6" and 8" diameter, 12" min. thickness)

• Removal of existing 18" corrugated metal pipe culvert

Pavement & Gravel Area Design

Drive approaches were designed using TxDOT Item 247 flexible base specifications, and gravel areas were designed using Grade 1 flexible base with native soil compaction requirements.

Pavement Sections:

• Drive Approaches: 6" 3,600 PSI Concrete, W/ #4 Bars @ 18" O.C.E.W. (per TxDOT Item 247)

• Gravel Areas: 10" Grade 1 Flexible Base (TxDOT Item 247), 12" Scarified & Compacted Native Soil, Compacted to 95% Max Density

Stormwater & Drainage Infrastructure

The drainage design for Brickyard Road represents the most complex stormwater engineering on the project. Three separate proposed storm channels (Channel A, B, and C) were designed to intercept and convey runoff from the large impervious site, with full hydraulic calculations for each channel and a proposed Class IV storm culvert (18" RCP) for outfall control.

Drainage Design Components:

• Existing drainage area map

• Proposed drainage area maps (Channels A, B, and C)

• Storm Channel A, B, and C hydraulic calculations (5 sheets)

• Proposed 18" RCP Class IV storm culvert with headwall

• Proposed grouted rock riprap (D50 – 6" and 8") at outfall locations

Underground Detention Design

Due to the site's proximity to IH-35 and the significant increase in impervious cover, an underground detention system was required to attenuate peak runoff rates from the developed site. Merritt Engineering designed the detention system with full calculations and standard details, producing one of the firm's most detailed stormwater management plan sets to date.

Detention Design Components:

• Detention Basin B.1, B.2, B.3 (multiple sheets per basin)

• Detention Basin B Summary

• Underground Detention Standard Details & Construction Notes (2 sheets)

• Detention sizing calculations and volume summary

Erosion Control Plan

A construction-phase erosion and sediment control plan was developed in compliance with TCEQ and TxDOT requirements, accounting for the site's frontage road exposure and proximity to IH-35 drainage infrastructure.