Ordinance No. 19777 - Laserfiche WebLink

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An onsite air-quality test, in which measurements were taken for six hours a day under variable and uncontrolled «~eather conditions o1~ four consecutive weekdays ~~riday, March 1, and Monda -Wednesday, March 4-6}, from two sites, one due east of the Neste plant at the eastern Y edge of the proposed industrial buffer, and t}~e other in the residential area just north of the buffer area, detected no more than .Od 1 ppm. a~~erage exposures on any day, using the most sensitive testing methodology avai}able. The highest projected .concentration in LRAPA's model occurs right ne~ct to the plant on the western side of the 1~~-foot railroad right of i~ray, over 5~Q feet from any potential residential use, only under specific wind direction, wind speed, and air ~ stability conditions. This level is approximately one-half the level to which workers may be exposed continuously for eight hours a day, 3~o days a year under the Federal Occupational Health and Safety Act OSHA}. The OSHA standard is 1.2 parts per million, or 1,50 micrograms per cubic meter, compared with the measured .ool ppm. or < 1 microgran~slcubic meter actually measured in the monitoring tests described above. The highest projected concentration occurring ~ outside the proposed buffer area, according to LRAPA's models, would be only one third of the eight-hour, 3o0-day-per-year OSHA standard. Furthermore, these exposures would, according to the model, occur with far less frequency than the Bail ex osure assumed b the OSHA standards. For example, the highest concentration on Y P Y the site, which occurs at the west side of the Burkland property next to the railroad right of way just east of the Neste plant, occurs only about one percent of .the time, compared to the 8-hour Bail ex osure of double that concentration permitted for workers at the plant site. Y p LRAPA'~ model assumes that the. wind Bows generally from west to east toward the Springwood site about 25 ercent of the time. The rest of the time the wind will be blowing the plant's. p emissions in other directions. The most common condition on the site will be a zero concentration, because the wind will be blowing in another directian.~ when the wind is from the west concentrations at an given distance will often be at or near zero, and will ~ only Y occasionally and briefly approach the highest concentrations, which'themselves are well below the OSHA standards. The mo$t fre uent combination of west-to-east direction and any given q air stabilit condition is about 13 percent, which is to say that about 13 percent of the time the . Y . .. . wind ~w~ll be flowing generally west to east ~ under stab~l~ty condition ~ D. The highest concentrations projected for the entire site occur when the wind is at one mile per hour under these conditions, or about $.5 percent of the time that all other conditions are present. Eight and a half percent of 13 percent is 1.15 percent. ..