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Phosphorous is used as a target analyte to detect contamination from red <br /> phosphorous and/or hypophosphorous acid. <br /> ➢ Phosphorous was reported at <100 µg/100 CM2 in all surface wipe samples <br /> collected inside the house. Phosphorous was reported in the septic system <br /> water sample at a level of 3.72 mg/L. Phosphorous was reported in the two <br /> soil samples collected at a level of 156 mg/Kg in the soil next to the house and <br /> 227 mg/Kg in the soil next to the irrigation pump/well. <br /> ➢ Phosphorous is naturally found in septic systems and in soil, particularly in <br /> agricultural settings and its presence in the soil and water samples does not <br /> imply contamination from drug manufacturing. <br /> CHLORIDE <br /> Chloride analysis is used to determine if contamination has occurred from <br /> hydrochloric acid and/or hydrogen chloride gas. <br /> ➢ Chloride was detected in all surface wipe samples indoors except for the <br /> sample collected from the master bedrooms walls. The detected chloride <br /> levels indoors ranged from 82.5 4g/100 cm2 in the master bathroom toilet and <br /> tub to 1,380 µg/100 cm2 on the kitchen ceiling. Chloride was reported in the <br /> septic tank water sample at a level of 1.6 mg/L and was non-detect in the both <br /> of the soil samples collected. <br /> ➢ The levels of chloride reported the samples indicate contamination of the <br /> indoor building surfaces from methamphetamine production, particularly in the <br /> vicinity of the kitchen. <br /> PH <br /> The pH is determined to detect possible contamination from acids or alkaline <br /> solutions. The pH is a logarithmic scale ranging from 0-14. Neutrality is <br /> considered to be at pH 7, which is equivalent to the pH of water. A pH less than 7 <br /> is considered acidic,while a pH greater than 7 is considered alkaline. <br /> ➢ The pH levels in the surface wipe samples ranged from 4.9 in the sample <br /> collected from the kitchen floor to 7.2 on the hallway ceiling and wall vents. <br /> BFC Properties 10 NETWORK ENVIRONMENTAL SYSTEMS,INC.,p <br /> Preliminary Site Assessment NES Project Number 04-261 <br /> 26237 Miller Avenue, Escalon, California <br />