5. Arsenic is a naturally occurring element in the earth's crust. One APL study not cited by the authors is the study of Shen et al. Pure arsenic is a gray-colored metal, but this form is not common in the environment. Arsenic and lead K and BAF predictive model results.....48 Table 16. almost 10 times lower than the LOAEL, suggesting that arsenic in this well should not pose a non-cancer health hazard to adults. LOAEL ADJ = 0.016 mg Cd/m 3. The lowest observed adverse effect level (LOAEL) was 7.6-125 μg/L and the 95% confidence limit of benchmark concentration at which the incident rate increases 5％(BMCL05) was 19.5-54.1 μg/L. The weight of evidence indicates strongly that, at lower exposure levels, arsenic toxicity is a function of cumulative dose and that the NOAEL and LOAEL for long-term chronic exposure should be lower than for short-term exposure. (1956) which describes a population poisoned by ingestion of arsenic contami-nated soy sauce. (2001), which evaluated the efficacy and safety of a reduced arsenic trioxide dose, 0.08mg/kg- The arithmetic mean of the arsenic concentration in the wells used by the individuals in the NOAEL group is 9 ug/L (range: 1-17 ug/L) (Abernathy et al., 1989). The duration-adjusted LOAEL (LOAEL ADJ) was calculated as follows: LOAEL ADJ = 0.088 mg Cd/m 3 x 6.2 hours/24 hours x 5 days/7 days . The arsenic concentration in Well 2 was 23 µg/L—lower than the current drinking water standard of 50 µg/L, but higher than the 2006 standard of 10 µg/L. Arsenic and lead concentrations with summary of bioassay results.....42 Table 14. It includes selection of the critical data set, identification of a critical endpoint with its no-observed-adverse- affect level (NOAEL) or lowest-observed-adverse-effect level (LOAEL), and assessment of uncertainty. Recycling the arsenic-rich biomass of Pteris vittata is a critical problem during phytoremediation primarily because of the low value and high risk of arsenic-rich biomass. Dose-Response Assessment The process for deriving the UL is described in this section and outlined in Box 3-1. Lettuce and earthworm LOAEL values compared to current SSL values.....43 Table 15. Following is a summary of the defined doses in mg/ kg/day from the principal and supporting studies: (1) Tseng (24): NOAEL = 0.8; LOAEL = 14 (2) Cebrian et al. the LOAEL value of 0.05mg/kg-day obtained from the case-report of Mizuta et al. Arsenic is ubiquitous in nature and is commonly found in drinking water sources in California. Table 13. The averages of the arsenic concen-tration in the middle- and high-dose wells were 70 and 680 mg/L, respectively. on the inorganic arsenic concentration in drinking-water. The Division of Water Quality’s GAMA Program, in its Groundwater Information Sheet for Arsenic (PDF), has a map of arsenic detection, based on monitoring information from DDW's water quality monitoring database. The arithmetic mean of the arsenic concentration in the wells used by the individuals in the LOAEL group is 170 ug/L (Tseng, 1977; Figure 4). Among these, skin lesion was the adverse effect observed at the lowest concentration. (28): NOAEL = 0.4; LOAEL = 22 (3) Southwick et al. 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