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.OAGRICULTURAL Analytical Chemists June 4, 2026 Lab No. : STK2637341-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Scott Sanglaang Sampled On : May 19, 2026 at 11:15 1868 East Hazelton Ave. Sampled By : Rena-Lerey Stockton, CA 95205 Received On : May 19, 2026 at 13:26 Description :Well Head Matrix : Drinking Water Project :17947 Seidner Rd , Escalon - SR0065527 Sample Results - Inorganic ®®�®� Sample Analvsis General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 282 2.5 mg/L 05/21/2026 10:00 ac 2340B 05/21/2026 14:26 ac Calcium 62 1 mg/L 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 14:26 ac Magnesium 31 1 mg/L 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 14:26 ac Potassium 4 1 mg/L 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 14:26 ac Sodium 22 1 mg/L 1 05/21/2026 10:00 ac EPA 200.7 05/21/2026 14:26 ac Total Cations 6.7 -- meq/L 05/21/2026 10:00 ac Calc. 05/21/2026 14:26 ac Boron 0.03 0.01 mg/L 1 05/22/2026 12:00 ac EPA 200.8 05/22/2026 20:58 ac Copper 16 2 ug/L 10002 1 h 05/22/2026 12:00 ac EPA 200.8 05/22/2026 20:58 ac Iron ND 30 ug/L 300' 1 U 05/21/2026 10:00 ac EPA 200.7 05/21/2026 14:26 ac Manganese ND 0.5 ug/L 502 1 Uh 05/22/2026 12:00 ac EPA 200.8 05/22/2026 20:58 ac Zinc 10 10 ug/L 5000 1 05/22/2026 12:00 ac EPA 200.8 05/22/2026 20:58 ac SAR 0.6 05/21/2026 10:00 ac Calc. 05/21/2026 14:26 ac Total Alkalinity(as CaCO3) 300 10 mg/L 1 05/22/2026 13:16 amm SM 4500-H+B 05/22/2026 18:04 amm Hydroxide as OH ND 10 mg/L 1 U 05/22/2026 13:16 amm SM 4500-H+B 05/22/2026 18:04 amm Carbonate as CO3 ND 10 mg/L 1 U 05/22/2026 13:16 amm SM 4500-H+B 05/22/2026 18:04 amm Bicarbonate as HCO3 360 10 mg/L 1 05/22/2026 13:16 amm SM 4500-H+B 05/22/2026 18:04 amm Sulfate 27.0 0.5 mg/L 5002 1 b 05/26/2026 08:34 Idm EPA 300.0 05/27/2026 00:26 Idm Chloride 40 1 mg/L 5002 1 b 05/26/2026 08:34 ldm EPA 300.0 05/27/2026 00:26 ldm Nitrate as NO3 54.1 0.4 mg/L 45 1 05/20/2026 12:40 mml SM 4500-NO3 F 05/20/2026 14:22 mml Nitrite as N ND 0.2 mg/L 1 1 U 05/20/2026 12:40 mml SM 4500-NO3 F 05/20/2026 14:20 mml Nitrate+Nitrite as N 12.2 0.4 mg/L 10 1 05/20/2026 12:40 mml SM 4500-NO3 F 05/20/2026 14:22 mml Fluoride ND 0.1 mg/L 2 1 U 05/26/2026 08:34 ldm EPA 300.0 05/27/2026 00:26 ldm Total Anions 8.5 -- meq/L 05/26/2026 08:34 Idm Calc. 05/27/2026 00:26 ldm pH 7.2 --- units 1 05/19/2026 11:15 r-1 SM 4500-H+B 05/19/2026 11:15 r-1 Specific Conductance 803 1 umhos/cm 16001 1 05/22/2026 13:16 amm SM 4500-H+B 05/22/2026 18:04 amm Total Dissolved Solids 530 20 mg/L 1000, 1 05/22/2026 10:00 ctl SM 2540 C 05/26/2026 10:30 ctl MBAs(Screen) Negative 0.1 mg/L 1 U 05/20/2026 18:04 mct SM 5540 C 05/20/2026 18:24 mct Aggressiveness Index 11.9 10 --- 05/21/2026 10:00 ac Calc. 05/21/2026 14:26 ac Langelier Index(20°C) -0.003 20 --- 05/21/2026 10:00 ac Calc. 05/21/2026 14:26 ac Nitrate Nitrogen 12.2 0.4 mg/L 10 1 05/20/2026 12:40 mml SM 4500-NO3 F 05/20/2026 14:22 mml Metals,Total Arsenic 1 1 ug/L 10 1 It 05/22/2026 12:00 ac EPA 200.8 05/22/2026 20:58 ac DQF Flags Definition: h The MS/MSD did not meet QC criteria. U Constituent results were non-detect. b The Blank was positive for constituent but less than the PQL ND=Non-Detected,RL=Reporting Level,Di1.=Dilution MCL=Maximum Contamination Level.2-Secondary Standard. 3-CDPH Notification Level.AL= Regulatory Action Level. Section:Sample Results Page 2 of 8 Page 2 of 8 Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Linda Avenue 3442 Empresa Drive,Suite D 9411 W.Goshen Avenue Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 CA ELAP Certification No.1573 CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810