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Attachment 2 Summary of Laboratory Analysis of Septic Tank Samples Stockton Propeller Septic Tank 1 Septic Tank 2 Average Average Result Analyte TTLC STLC Result MRL Result MRL Result STLC Multiplier Antimony 500 15 ND 0.05 ND 0.05 0.05 300 Arsenic 500 5 ND 0.01 ND 0.01 0.01 500 Barium 10,000 100 0.1 0.02 0.1 0.02 0.06 1,667 Beryllium 75 0.75 ND 0.005 ND 0.005 0.005 150 Cadmium 100 1 0.12 0.01 0.02 0.01 0.07 14 Chromium (total) 500 5 ND 0.02 ND 0.02 0.02 250 Cobalt 8,000 80 ND 0.02 ND 0.02 0.02 1 4,000 Copper 2,500 25 0.074 0.02 0.025 0.02 0.0495 505 Lead 1,000 5 0.98 0.05 0.12 0.05 0.55 9 Mercury 20 0.2 ND 0.0002 ND 0.0002 0.0002 1,000 Molybdenum 3,500 350 ND 0.02 ND 0.02 0.02 17,500 Nickel 2,000 20 ND 0.02 ND 0.02 0.02 1,000 Selenium 100 1.0 ND 0.01 ND 0.01 0.01 100 Silver 500 5.0 ND 0.02 ND 0.02 0.02 250 Thallium 700 7.0 ND 0.02 ND 0.02 0.02 350 Vanadium 2,400 24 0.028 0.02 0.022 0.02 0.025 960 Zinc 5,000 250 0.37 0.02 0.1 0.02 0.235 1,064 Cyanide (total) - - ND 0.005 ND 0.005 0.005 NA pH - - 6.75 0.01 j 6.88 0.01 1 6.815 1 NA Notes: Bold Indicates this metal was detected above regulaotry limits by DTSC in sampling of various containers inside SPI. STLC: Soluble Threshold Limit Concentration TTLC:Total Threshold Limit Concentration ND: Not detected above the method detection limit. MRL: analytical laboratory method reporting limit NA: Not applicable All values in mg/L, except for TTLC which is mg/Kg Samples collected on December 20, 2021 by Tim Wong of SPI. Samples were depth composited by collecting samples at 1.5 and 3 ft from the tank contents surface. Metals analyzed by EPA method 6010B Cyanide analyzed by SM4500-CN E pH analyzed by SM4500-H B and was done outside of holdtime Average Result STLC Multiplier is the STLC value divided by the average metal concentration detected. If ND, the MRL was used. Blankinship&Associates,Inc. 5/24/2022