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Tri-Ag Services, Inc. 2- July 11, 2017 <br />The last documented level of 49 pg/L for 1,2-DCP in the Tri-Ag domestic well exceeds <br />the above referenced screening level of 5 pg/L by approximately 10 times. Per our <br />discussion, I have included a CD with the above referenced Kleinfelder report as well as <br />the follow-up work plan for your records. <br />On June 08, 2017, Central Valley Water Board staff sampled MW-3 located down- <br />gradient of the domestic well. The following table details the analytes detected and <br />current screening levels: <br />Analyte Sample Result <br />(pg/L) <br />Current Screening Level <br />(pg/L) <br />Nitrate as N 45 10A <br />Phosphorus 0.46 N/A <br />Total Kjeldahl Nitrogen <br />(TKN) 1.4 N/A <br />Total Nitrogen 46 N/A <br />alpha-Chlordane 0.0039 0.1A <br />Dieldrin 0.0051 0.0026 <br />Heptachlor epoxide 0.0047 0.01A <br />NOTES: <br />A - California Division of Drinking Water Primary Maximum Contaminant Level (MCL) <br />B - Notification levels (formerly called "action levels") are published by the California <br />State Water Resources Control Board, Division of Drinking Water (SWRCB, DDW) for <br />chemicals for which there is no drinking water MCL. Notification levels are based mainly <br />on health effects <br />N/A - Not Applicable <br />Comments <br />1. Nitrate as N exceeded the CA MCL for drinking water of 10 pg/L in MW-3. <br />Dieldrin exceeded the CA Notification Level of 0002 pg/L. 1,2,3-TCP was not <br />detected in MW-3 above the reporting limit of 0.005 pg/L which is equal to the <br />currently proposed CA MCL. 1,2-DCP was not detected in MW-3 above the <br />reporting limit of 0.50 pg/L which is equal to the current CA MCL.