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South San Joaquin Irrigation District DRAFT Lead Assessment&Abatement Work Plan April 9, 2017 The grid on Figure 6 consists of 33 50' x 50' squares. One (1) sample location per grid will be identified in which four (4) samples will be collected as follows: surface, 6" below ground surface (bgs), and 12" and 18" bgs. Sampling equipment will be thoroughly cleaned between sample locations to prevent cross-contamination. One (1) duplicate and one (1) equipment blank sample will be collected during collection of every 10 field samples for QA/QC purposes and in order to assess sampling accuracy and precision. Initially, surface samples will be analyzed to assess compliance with the California Office of Environmental Health Hazard Assessment (OEHHA) California Human Health Screening Level (CHHSL) and to determine disposal requirements. Because the SSJID canal is a commerciallindustrial property, the applicable lead CHHSL is 320 mg/Kg. The initial soil samples will be analyzed using Total Threshold Limit Concentration (TTLC) methodology. Depending on the lab results, additional testing to assess the Soluble Threshold Limit Concentration (STLC) may be done. Depending on both STLC and TTLC results, Toxicity Characteristic Leaching Procedure (TCLP) analysis may also be conducted. If a sample is analyzed and lead is reported as below 50 mg/Kg, the sample(s) beneath it are assumed to be lower in concentration than the sample above it and therefore will not be analyzed. 3.4 Excavation, Disposal, and Transportation Based on the results of Task 3.3, soil will be classified as non-impacted (i.e., less than the CHHSL of 320 mg/Kg), Non-Hazardous Waste, Non-Resource Conservation and Recovery Act (RCRA) CA- Restricted Hazardous Waste, or RCRA Hazardous Waste. Depending on the classification, the soil may stay in place, will be returned to the ESC, or disposed of at an appropriate landfill. Copies of hazardous waste manifests and disposal records, if any, will be submitted to SJCEHD within 30 days. 3.5 Closure Report A report will be prepared that describes the details and results of tasks 3.1 through 3.4 and will be signed by a licensed California Civil Engineer. Page 14 Blankinship & Associates , Inc .