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Sampling and Analysis Plan for <br /> Phase II Environmental Site Assessment <br /> South Pointe Property: 701, 705, 833, 855 West Weber Avenue <br /> Stockton, California <br /> Quality Controls <br /> May 17, 2021 <br /> a pre- and post-shipment vacuum check of each canister serves as an evaluation of sample integrity <br /> during shipping. <br /> 10.1.1.4 Temperature Blanks <br /> Each cooler containing soil samples to be analyzed for OCPs will contain a 40-milliliter volatile organic <br /> analysis (VOA)vial marked "temperature blank."This blank will be used by the sample custodian to check <br /> the temperature of samples upon receipt. <br /> 10.1.2 Assessment of Field Variability (Field Duplicate or Co-located <br /> Samples) <br /> Duplicate soil samples will be collected at sample locations TP-9, -14, -16, and -18, based on elevated <br /> concentrations of OCPs historically observed at these locations. Two additional locations will be selected <br /> in the field based on low to moderate historical concentrations of OCPs. <br /> Duplicate passive soil vapor samples will be collected at a rate of ten percent. Because soil vapor <br /> conditions beneath the site are undefined, duplicate passive soil vapor modules will be deployed at <br /> random locations selected during installation. Active soil vapor samples will also be collected at a rate of <br /> ten percent. Locations will be identified following review of passive soil vapor data and will be selected to <br /> be representative of a range of VOC mass conditions (such as areas with relatively high mass <br /> accumulations, areas with moderate mass accumulations, and areas of low mass accumulations). Active <br /> soil vapor samples will be collected in parallel with the primary sample using a single-use sampling 'tee' <br /> provided by the laboratory. <br /> Duplicate samples will be preserved, packaged, and sealed in the same manner as other samples of the <br /> same matrix. A separate sample number and station number will be assigned to each duplicate, and it will <br /> be submitted blind to the laboratory. <br /> 10.2 BACKGROUND SAMPLES <br /> Background samples are not proposed. The areas surrounding the site were historically used for similar <br /> purposes and may be similarly impacted by OCPs. Therefore, identifying a reliable location for a <br /> background sample is not considered feasible. <br /> 10.3 FIELD SCREENING, CONFIRMATION SAMPLES, AND SPLIT <br /> SAMPLES <br /> Field screening is not proposed, therefore confirmation sampling is not applicable. Collection of split <br /> samples is not proposed. <br /> M <br /> Project No.: 185704833.5.3&5.4 10.2 <br />