TSA and Phase I Phase II SIte Cleanup Construction

An Environmental Site Investigation (Phase II) concentrates on determining the occurrence or presence of an environmental hazard and subsequent risk at the specific property. The Phase II service involves a soil, groundwater, and/or unknown wastes sampling and certified laboratory testing. Sampling and testing procedures for the Phase II meet the Environmental Protection Agency (Cal-State EPA) regulations, methods, Health & Safety codes, Uniform Fire codes, and lead-agencies guidelines, and includes the following tasks for case studies:
Soil & groundwater investigation at Hemet site
1) Soil Investigation Procedures
a. A workplan procedure is necessary to setup representative soil sampling, boring locations, sampling number, and chemical analytical parameters for the specific property. Addressing and justifying any and all deviations form the preliminary site investigation (Phase II) workplan.

b. Hydrogeology Survey

c. The purpose of this preliminary soil investigation is to define whether there is soil contamination or not. Secondary site investigation will be required if soil contamination is found at the site by the preliminary soil investigation. Vertical and lateral extent of contaminated soil shall be defined by providing a secondary soil investigation procedure.

d. Sample preparation and preservation meets EPA Method 5035. Upon retrieval, soil samples shall be sealed, labeled, and chilled in an icebox for cold storage and shipped to a California State Department of Health certified analytical laboratory.

e. The collected soil samples shall be delivered to the certified Lab within 12~24 hours after soil sampling with a chain-of-custody documentation. The soil samples shall be analyzed with chemicals using EPA Analytical methods.

f. Provide soil vapor monitoring service using an organic vapor analyzer (OVA), in accordance with Contaminated Soil Mitigation Plan (South Coast Air Quality Management District rule 1166).

g. Conclusion and Recommendation



2) Groundwater Investigation Procedures

These requirements are to be used for Hydrogeologic Assessments and Groundwater Monitoring Programs, in order to show that the groundwater investigation meets Regional Water Quality Control Board's (Cal-RWQCB) requirements, determined as follows:

- Impacts of discharges on groundwater quality
- Lateral and vertical extent of contaminants plume
- Groundwater gradient and direction of flow
- Specific aquifer properties as required.

a. Work Plan: A work plan should be submitted to meet the general requirements for subsurface investigation.

b. Field Procedures: Furnish and install groundwater well at the subject site.

c. Groundwater Sampling: Representative groundwater sampling is required by the lead agency.

d. Groundwater Analysis: Comply with chain-of-custody procedures. Samples must be handled and analyzed according to the laboratory requirements for groundwater samples analysis and QA/QC guidance document.

c. Reporting: Incorporate all boring logs, geophysical logs, and sieve analysis results with interpretation in final report. Illustrate the groundwater contaminant plume by plan view and cross section, including direction of section lines, scale, legend, constituent concentrations, and lithology. Recommend additional assessment requirement and plants for site remediation as needed.

TSA and Phase I Phase II SIte Cleanup Construction


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