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Red Creek Quarry Baseline Water Investigation Section 4 <br /> <br /> <br />4-2 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. <br />4.2 Groundwater Well Purging and Field Parameters <br />Monitoring wells are purged prior to sample collection per methodology outlined in the Sampling and <br />Analysis Plan ([SAP]. BC 2023a, Appendix 3.6) and applicable standard operating procedure (SOPs). <br />Water quality field parameters monitored included pH, specific conductance (SC), dissolved oxygen <br />(DO), oxidation reduction potential (ORP), temperature, and turbidity. Water quality field instruments <br />were rented from and pre-calibrated by Pine Environmental. Field instruments were calibrated again <br />if used after the first day. <br />During the 3Q 2022 sampling event, purging was conducted using low-flow techniques (micro- <br />purging) with pneumatic bladder pumps (Photo 4-1) at a rate of approximately 100 milliters per <br />minute for Well 1, Well 3, and Well 4. The water level in each well was monitored to evaluate the <br />drawdown during the low-flow purging. Low-flow sampling methods were not used after the first <br />sampling event (3Q 2023) due to slow groundwater recharge rates and prolonged purging times to <br />reach stable water quality parameters. <br />Quarterly sampling for the remaining four sampling events utilized bailers to purge the groundwater <br />wells (Photo 4-2). The wells were bailed to remove as much water as practical then allowed to <br />recharge overnight prior to sample collection. The water level was measured prior to purging and at <br />the conclusion of purging using an electronic water level probe to verify the removal of stagnant <br />water within the wells prior to sampling (Photo 4-3). Sampling was conducted within 24 hours using <br />a bailer. Bailers were disposed of at the end of each sampling event. <br /> <br />Photo 4-1. Example of the low-flow purging methods used in 3Q 2022 sampling events <br />