COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

July 6, 2017 Monitoring Well Installation Workplan Control Board. The sampling will be in accordance with the Groundwater Sampling and Analysis Plan (SAP) which is attached as Appendix C. Groundwater elevations relative to mean sea level (nisi) (NAVD 88) shall be determined by subtracting the measured depth to water from the elevation of the measurement point at the well. All water level depths shall be measured using a water level sounder accurate to 0.01 foot. Per the WDRs, the monitoring wells shall be sampled quarterly for eight consecutive quarters. Following the eight consecutive quarters of sampling, the frequency of sampling may be reduced to semi-annual sampling pending RWQCB approval. The wells will be purged and sampled using a submersible pump and vinyl discharge tubing.9 The pump, tubing, and power cord shall be decontaminated prior to each use. Field parameters (pH, electrical conductivity, and temperature) shall be monitored using a multimeter and flow cell (for example, a YSI Model 556 multimeter). The multimeter shall be calibrated at least twice a day and more frequently as needed depending on sample pH and electrical conductivity. Samples shall be collected after a minimum of three casing volumes are purged and when field parameters do not vary more than 10% between subsequent casing volumes (± 10mV for ORP). Purged water shall be disposed of at the well sites. 7. Schedule for Completion of Work and Reporting Submission of this Monitoring Well Installation Workplan is required prior to the scheduled construction of any groundwater monitoring well. Replacement well construction shall be scheduled promptly after receiving Workplan approval. Within 30 days of completing the construction activities, a Monitoring Well Installation Report shall be submitted to the Regional Water Quality Control Board. The report shall document well installation activities and include well construction diagrams, boring logs, well development records, and measuring point elevations. Additionally, separate monitoring well construction reports will be prepared and filed with the California Department of Water Resources as required by the California Water Code. The first sampling event will occur no sooner than 30 days after submission of the Monitoring Well Installation Report. 9 FGL Environmental sampling protocol, written communication, July 31, 2009. HydroFocus, Inc. 8