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=ESSMENT, ---- —=_� Page 7 January 29,2019 PC Project Number 2018-10-038 Monitoring Well Purging and Sampling Monitoring wells were purged of a minimum of three volumes of water, or until dry, using a new disposable bailer. Water purged from the monitoring wells was monitored for pH, specific conductivity, and temperature. All purge water generated onsite was dispersed on the ground. Sampling data sheets are located in the Appendix. Groundwater was transferred from the sampling device into laboratory provided containers. The containers were filled by inserting a narrow diameter tube into the bailer and allowing a slow and steady stream of water to escape the bailer and fill the container. Once the containers were full, they were labeled, and placed on ice for transportation to the laboratory. Samples were transported within 24 hours to California Agriculture and Environmental Laboratory(formerly Argon Labs)in Ceres,California under chain of custody documentation. However, Samples were transported by California Agricultural & Environmental Laboratory to Precision Enviro-Tech Analytical Laboratory of Stockton CA for analysis. Results of the sampling event are presented in the Table below and cumulative results are located in the Appendix Table 2. Monitoring Well Laboratory Analytical from December 20, 2018. Constituent Measurement MW-1 MW-2 MW-3 Water Quality Goals* Nitrate as N mg/1 39 14.0 2.1 10 mg 0 Total Dissolved Solids mg/1 210 410 580 500 pH none 7.12 7.26 7.44 6.5-8.5 Total Fixed Dissolved Solids m 98 200 270 NR Boron mg/1 0.33 0.36 0.34 700 Iron mg/1 0.42 0.38 0.56 300 Manganese mg/1 ND ND ND NR Total Alkalinity mg/1 184 321 320 NR Hydroxide Alkalinity mg/1 ND ND ND NR Bicarbonate Alkalinity mg/1 170 307 320 NR Carbonate Alkalinity mg/1 13.0 13.0 ND NR Calcium mg/1 83 77 98 NR Chloride mg/1 102 64.7 124 106 ENViRO ASSESSMENT,PC ENVIRONMENTAL•ENGINEERING•GEOLOGY PHONE (844)742-7311 FAX (877)623-5493