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a <br />Operational Summary - As shown in Table 1, between June 22 and September 27, 2017, the <br />CAP system treated approximately 21,897,500 gallons of groundwater at an average flow <br />rate of 229,868 gallons per day. During the third quarter 2017 monitoring period, it is <br />calculated that the GTF removed approximately 0.19 pounds of VOCs. <br />Del -Tech records indicate that the groundwater extraction and treatment system <br />experienced the following maintenance issues and periods of downtime during the third <br />quarter 2017: <br />• August 15, 2017: Del -Tech reported that well EW -4 was off-line and the breaker <br />would not reset. Del -Tech pulled the pump and determined that the pump motor <br />had failed. GLA notified the CVRWQCB of the pump failure. A replacement pump <br />was installed on August 22, 2017. <br />• August 15, 2017: Del -Tech removed the flow meters from all extraction wells for <br />annual calibration. The calibrated flow meters were re -installed on September 21, <br />2017. <br />Effluent Monitoring — During the monitoring period, effluent samples were collected <br />monthly and submitted for analysis of VOCs by EPA Method 8260B. Table 1 summarizes the <br />field and analytical results for the GTF during the third quarter 2017 monitoring period. As <br />shown on Table 1, treated effluent discharged into the infiltration pond contained trace <br />concentrations of up to four VOCs in the monthly effluent samples. In addition, cis-1,2- <br />dichloroethene and tetrachloroethene were consistently measured above the practical <br />quantitation limit during the third quarter monitoring event. Total VOC concentrations in <br />the effluent ranged from 1.75 lag/L to 3.15 µg/L during the monitoring period. Currently, <br />Forward is in the process of preparing design plans to convert to a granular activated carbon <br />treatment system to better remove VOCs from the groundwater. <br />GLA hopes that the information provided herein is sufficient for your records. If you have <br />any questions regarding this notification, please call me at (858) 451-1136. <br />Geologic Associates <br />William B. L z, PG, CHG <br />Senior Geologist <br />cc: Joseph Lipka, Forward Inc. <br />Victoria Warren, Republic Services <br />Enclosure: Table 1—GTF Influent/Effluent Sample Results and Flow Rate <br />Analytical Results —BC Laboratories <br />Field Monitoring Reports —Del Tech <br />M:\5017.1030\GTFrn onrpt3Q17.docx 2 <br />