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Sampling and Analysis Plan for Phase II Environmental Site Assessment South Pointe Property: 701, 705, 833, 855 West Weber Avenue Stockton, California Project and Data Quality Objectives May 17, 2021 users of the site, and inhalation of VOCs sourced from groundwater or VOC soil source areas at the site. • As indicated in Step 5, the investigation will apply a sample collection approach based on DTSC guidance and standard analytical methods and established laboratory performance criteria. • Laboratory data will be reviewed to ensure they are of sufficient quality to support decision making. • Analytical results will be compared to applicable screening criteria to identify potential adverse impacts to human health. This comparison shall serve as the basis for recommending no additional action; recommending additional assessment, if warranted; and recommending appropriate remedial or mitigation measures, if warranted, based on the current understanding of current and proposed future site use. 3.3 MEASUREMENT QUALITY OBJECTIVES Measurement quality objectives are criteria for assessing viability and usability of data. These objectives are based on both field and laboratory protocols that examine whether data quality indicators (DQIs) meet acceptance criteria established for the project. Sampling will be completed in accordance with procedures detailed in Sections 4.0 and 6.0 of this document as well as in accordance with SOPs included in the project quality assurance project plan (QAPP) (Stantec, 2021), to ensure representativeness of sampling results. Laboratory QA/QC criteria and reporting limits have been reviewed and meet project DQIs. Project DQIs and acceptance criteria are summarized in Table 3-3 below. Table 3-3 Project-Specific Data Quality Indicators and Performance Criteria Matrix: Soil Analytical Group: Lead Title 22 Metals analytegroup) Data Quality QC Sample and/or Method Used Measurement Performance QC Sample Assesses Indicators to Assess Measurement Criteria Error for Sampling Performance and/or Analytical Precision Field Duplicate RPD: <_50% S&A MS 75%- 125% recover A MS/MSD RPD: <_20% A LCS 80%- 120% recovery A LCS/LCSD RPD: <_20% A Lab Duplicate RPD: <_20% A Accuracy/Bias- Rinsate Blank Metals Concentrations< PQL S&A Contamination Method Blank Metals Concentrations< PQL A Accuracy/Bias LCS 75- 125% recovery A LCS/LCSD RPD: <_20% A MS 75%- 125% recover A MS/MSD RPD: :5 20% A Accuracy Reporting Limit Verification 1 80-.120% A M Project No.: 185704833.5.3&5.4 3.4