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<br />SAMPLING AND ANALYSIS PLAN <br />Water quality monitoring and sampling for the Forward Landfill located within the Central Valley <br />RWQCB Region was conducted by Del-Tech geotechnical support services (Del-Tech), in <br />accordance with WDR Order No. R5-2024-0002 issued specifically for the Forward Landfill. This <br />sampling and analysis plan describes the methods and procedures used to collect water quality <br />samples at the Forward Landfill. <br />Laboratory Analytical Methods <br />Chemical analyses were performed by Pace Analytical, a state-certified laboratory. Groundwater, <br />surface water, leachate, and lysimeter samples were analyzed for the list of parameters <br />summarized in Table 1, which also presents the laboratory analytical methods used during the <br />sampling event. Copies of the certificates of analyses and Chain-of-Custody records for the <br />samples collected this quarter are included with the analytical reports in Appendix C. <br />Well Purging and Sampling <br />The following sampling protocols listed below were generally followed during groundwater <br />sampling operations: <br />• Upon arrival at the wellhead, each monitoring point was inspected for evidence of tampering <br />and/or vandalism, and the well identification (I.D.) was recorded. <br />• The water level was measured directly using a weighted water-level indicator (sounder) to <br />an accuracy of 0.01 foot. Prior to measuring the water level, the sounder was <br />decontaminated using an Alconox® soap solution, followed by two rinses with deionized water. The <br />wells were then sounded and the initial water level and the total depth of the well (if obtainable) were <br />recorded on a Well Data Sheet. <br />Groundwater Sampling Using Traditional Well Sampling Methods <br />For the Forward Unit wells, Austin Unit wells equipped with Waterra sampling equipment, and <br />for wells sampled with non-dedicated sampling equipment, groundwater sampling was performed <br />using traditional well sampling methods described below. <br />• Each well with sufficient recharge was purged of a minimum of three casing volumes and <br />allowed to recover to 80 percent of the original well volume prior to sampling. Based on the <br />measured depth to water, the total depth of the well, and the known casing diameter, a well <br />casing volume was calculated using the following equation: <br />CV = (π) (CD/2)2 (HW)(7.48) <br />where: <br />CV = casing volume (gallons) <br />CD = casing diameter (feet) <br />HW = height of water column within well (feet) <br />7.48 = conversion from cubic feet to gallons.