Our experienced staff develop cost-effective investigation approaches related to a wide range of environmental concerns and are experienced in conducting site investigations of varying complexity including: advancing soil borings; installing groundwater monitoring wells, extraction and injection wells; collecting surface and subsurface soil and water samples for assessment purposes; installing and sampling soil vapor probes for vapor intrusion potential; and performing exploratory excavations. We are experienced in collecting a wide range of media samples including: soil, sediment and rock; surface and groundwater; soil vapor; indoor air and air (associated with earth moving activities) to assess the risk to public health and the environment, and to determine if any mitigative measures are required to reduce or eliminate the impact.

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Our approach to soil, soil gas, and groundwater investigations is simple. First, we must fully understand the project and problem statement, including site background and history, as well as research and evaluate any previous investigations performed on the subject property, if applicable. By accomplishing this, Stratus can apply cost-effective and innovative approaches to streamline the investigative process and reduce or eliminate rework.

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However, prior to the commencement of fieldwork, Stratus works with site owners and the regulatory agencies, if appropriate, to develop a comprehensive investigative work plan. Stratus will design and focus the investigative work plan to complete the investigation in a single phase, reducing overall project costs and accelerating the site characterization schedule.

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Stratus will evaluate each project on a case-by-case basis to determine the sample collection strategy and approach as well as the analytical testing methodology.

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We will correspond directly with the laboratories to ensure that the samples are analyzed using the correct U.S. EPA methods, the data is validated and usable, and the specified turn-around-times are met. All samples collected by Stratus will be analyzed using a California certified laboratory.

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Preparation of the Phase II Site Assessment Report will be in accordance with ASTM E1903-11 and shall reference or contain all information prepared as part of the Phase I ESA, if applicable, with additional evaluation including, but not limited to:

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• Detailed narrative of Recognized Environmental Conditions indicated in the Phase I ESA,

• Scope of assessment,

• Methodology of field explorations,

• Evaluation and summary of results, and

• Conclusions and recommendations for further studies or mitigation efforts.

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