Contaminated Materials and Groundwater Investigation Work Plan, Chaska Flood Control Project Stages 3 and 4, Chaska, Minnesota: MPCA Phase II Investigation Work Plan.

摘要

This Phase II Investigation Work Plan discusses the field work and laboratory testing required to determine the extent of contaminated materials to be encountered during the construction of Stage 4 of the Chaska Flood Control Project. This work plan was developed in response to indications of potentially contaminated soils and groundwater (petroleum products, petroleum product and solvent odors, and dump/debris fill) encountered in several geotechnical soil borings advanced for geotechnical design purposes along the proposed levee and channel alignments. These borings were advanced for physical property testing rather than for contaminant analysis since contaminated materials and/or groundwater were not anticipated on these stages of the project. In addition, potential contamination sources were identified during a Phase I Environmental Site Assessment for these stages of the project. According to the Minnesota Pollution Control Agency (MPCA) document 'Update on Property Transfer Cleanup Assistance', a Phase II Investigation Work Plan is required to determine if the potential sources of contamination identified during the Phase I Investigation are actually causing a release or threatened release of hazardous substances to the soil and groundwater at the project site. This work plan contains background information on the site; the scope of work for Task 1, Work Plan and Health/Safety Plan, Task 2, Field Investigation Work, and Task 3, Phase II Investigation Report. The report also describes the methodology that should be followed in conducting soil borings, hand auger borings, soil classification, soil sampling and chemical analysis, decontamination, soil headspace analysis, and chain of custody.