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Human Services Agency - 5 - 2 August 2021 145 South Sutter Street Stockton, San Joaquin County Table 4 — Summary of Remedial Monitoring Groundwater Analysis Suite A (Hydrocarbons) TPHg, TPHd, BTEX, MTBE, naphthalene Suite B dissolved metals, total chromium, hexavalent chromium, (Remedial Indicators) TDS, bromide, bromate, sulfate, nitrate Field Measurements Depth to water, DO, ORP, EC, temp, pH TPHg= total petroleum hydrocarbons as gasoline; TPHd= total petroleum hydrocarbons as diesel; BTEX= benzene, toluene, ethylbenzene, xylenes; TDS= total dissolved solids; DO= dissolved oxygen; ORP= oxygen reducing potential; EC= electrical conductivity; temp= temperature Table 5 — Summary of Remedial Monitoring Monitoring Monitoring Wells Zone (Screen Interval) Analysis Frequency Suite A; Suite B; Treatment MW-2 (30-45 ft bgs) Field 2x Baseline; 1, 2, 3, 6, 9, & 12 MW-10 (94-104 ft bgs) months after injection Measurements Transition -- -- -- Compliance MW-6 (40-60 ft bgs) Field Suite A; Suite B; 2x Baseline; 1, 2, 3, 6, 9, & 12 MW-7 (43-63 ft bgs) months after injection Measurements Suite B; 3 6 Background MW-3A (37-57 ft bgs) Field 2x Baseline; , & 12 MW-9 (35-55 ft bgs) months after injection Measurements Table 6 — Summary of Contingency Plan When Action 1 Action 2 Action 3 Action 4 Implemented Concentrations of Collect Batch Extraction selected remedial confirmation of 2,000 gallons3 Sample If parameters' sample from from wells with compliance exceedances exceed Action wells with continued wells 30 days remain, Level S2 by 20% in exceedances exceedances following repeat Compliance Zone 30 days after following batch Actions 1 wells initial confirmation extraction through 3 exceedance sampling 1= Total chromium, hexavalent chromium, bromate, nitrate, sulfate 2= Action Levels to be determined by baseline sampling 3= Each batch extraction event will consist of the removal of 2,000 gallons or an effort of 5 days, whichever occurs first.