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City of Santa Ma On-cnll Environmental Review Services for Housing Division • Sampling of Desired Media. Upon receipt of the City's approval of a work plan (and regulatory oversight agency approval, if applicable), samples will be collected by support staff and overseen by the project manager. Samples can be obtained using a variety of methods (e.g., surface grab sample, shallow hand auger sample,backhoe sampling,high-flow/low-flow groundwater sampling,soil vapor sampling,direct push sampling,or hollow-stem auger or air rotary drilling).The appropriate sampling methodology is dependent on the suspected source of contamination(polntsource or non-point source);suspected type of contaminant (volatile or non-volatile); media affected (soil, groundwater, and/or soil vapor); anticipated depth of contamination;and soil/geologic conditions at a site.Depending on the scope of work,soil vapor wells,soil vapor probes,groundwater monitoring wells,groundwater extraction wells,or other sampling devices may need to be Installed at a site. Licensed professionals will perform or oversee the installation of sampling devices,where applicable.Prforto any subsurface assessment,Underground Service Alert utility notification service will be contacted and the area to be disturbed will be identified. The proposed locations will be • provided to the City for the Identification of possible subsurface utility conflicts. • Laboratory Analyses. Depending on the project schedule and budget,samples will be analyzed through an on-site laboratory (for very quick turn-around projects) or through a fixed laboratory (standard schedule project).A California-certified laboratory approved by the City will perform all analyses. • Data Analysts and Reporting. Sample analytical results will be tabulated and maps depleting sample collection points and pertinent data will be prepared.The data analysis will include a discussion of the nature and extent of contamination, and recommendations for follow-up work, if needed. Site closure, if appropriate, will be considered following all assessments.Additional assessment, remediation, or health risk assessment will be considered if site closure does not appear to be a viable alternative.All aspects of the Phase II ESA will be conducted under the direct oversight of a California Professional Geologist, or a California Professional Civil Engineer. Our on-staff California Professional Geologist, or a California Professional Civil Engineer,will sign and stamp all assessment reports. 10