4. Crews Gulch Regional Trail Phase II Project -BC Testing Frequencies.pdf

This document is a Quality Control (QC) Testing Frequency specification sheet for the Crews Gulch Regional Trail Phase II Project, prepared by El Paso County Parks in Colorado. The document outlines the minimum testing requirements for two specific pay items: reworked sidewalk subgrade and new concrete sidewalk installation. The testing requirements include various tests such as moisture-density curves, gradation, Atterberg limits, in-place density, and compressive strength tests, with specific sampling and testing frequencies detailed for each type of test.

The testing specifications are comprehensive and designed to ensure quality control during the construction of the trail project. For the reworked sidewalk subgrade, tests will be conducted on a per soil type basis and include one test every 300 linear feet for in-place density and relative compaction. For the new 5-inch thick concrete sidewalk, testing protocols include sampling the first two batches, then random testing per five batches, with compressive strength tests involving one set of 5 cylinders per 50 cubic yards, with cylinders broken at 7 days, 28 days, and one held in reserve. All testing will be conducted in accordance with the El Paso County Engineering Criteria Manual.