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.O `AGRICULTURAL Analytical Chemists October 18, 2022 Lab No. : STK2254407-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : October 6, 2022 at 12:01 1868 East Hazelton Ave. Sampled By : Frank Giardi Stockton, CA 95205 Received On : October 6, 2022 at 13:08 Description Wellhead Matrix : Drinking Water Project 2538 Pinasco Rd.-WP0043602 Sample Results - Inorganic 91 _ • . General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 198 2.5 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Calcium 43 1 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Magnesium 22 1 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Potassium 7 1 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Sodium 20 1 mg/L 1 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Total Cations 5.0 --- meq/L 1 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Boron ND 0.1 mg/L 1 U 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Copper ND 10 ug/L 10002 1 U 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Iron ND 30 ug/L 3002 1 J 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Manganese ND 10 ug/L 502 1 J 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Zinc 30 20 ug/L 1 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac SAR 0.6 0.1 1 10/13/2022 07:00 ac EPA 200.7 10/14/2022 08:44 ac Total Alkalinity(as CaCO3) 180 10 mg/L 1 I 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm Hydroxide as OH ND 10 mg/L 1 U 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm Carbonate as CO3 ND 10 mg/L 1 U 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm Bicarbonate as HCO3 220 10 mg/L 1 I 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm Sulfate 10.0 0.5 mg/L 5002 1 10/07/2022 16:11 ldm EPA 300.0 10/08/2022 04:57 ldm Chloride 28 1 mg/L 5002 1 1 10/07/2022 16:11 ldm EPA 300.0 10/08/2022 04:57 ldm Nitrate as NO3 44.5 0.4 mg/L 45 1 1 10/07/2022 16:11 ldm EPA 300.0 10/08/2022 04:57 ldm Nitrite as N ND 0.1 mg/L 1 1 J 10/07/2022 16:11 ldm EPA 300.0 10/08/2022 04:57 ldm Nitrate+Nitrite as N 10.1 0.1 mg/L 10 1 1 10/07/2022 16:11 ldm EPA 300.0 10/08/2022 04:57 ldm Fluoride 0.1 0.1 mg/L 2 1 10/07/2022 16:11 1dm EPA 300.0 10/08/2022 04:57 ldm Total Anions 5.3 --- meq/L 1 I1J 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm pH 7.83 --- units 1 T 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm Specific Conductance 506 1 umhos/cm 16002 1 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm Total Dissolved Solids 340 20 mg/L 10002 1 10/10/2022 11:19 ctl SM 2540 C 10/11/2022 10:34 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 10/07/2022 15:13 jba SM 5540 C 10/07/2022 15:25 jba Aggressiveness Index 12.1 1 1 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm Langelier Index(20°C) 0.3 1 1 I 10/10/2022 18:44 amm SM 4500-H+B 10/10/2022 21:59 amm Nitrate Nitrogen 10.1 0.1 mg/L 10 1 1 10/07/2022 16:11 ldm. EPA 300.0 10/08/2022 04:57 ldm DQF Flags Definition: U Constituent results were non-detect. J Reported value is estimated;detected at a concentration below the PQL and above the laboratory MDL. I The RPD for the laboratory duplicate exceeded laboratory criteria. 1 The MS/MSD did not meet QC criteria. T Exceeded method/regulatory-specific holding time. ND=Non-Detected, RL=Reporting Level, Dil.=Dilution MCL= Maximum Contamination Level. 2 - Secondary Standard. 3-CDPH Notification Level.AL= Regulatory Action Level. Section: Sample Results Page 3 of 9 Page 3 of 9 Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Lindo Avenue 3442 Empresa Drive,Suite D 9415 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 Env FAX:(805)525-4172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)783-2912 FAX:(559)734-8435 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