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A <br /> r _ <br /> 6R0 <br /> Ms. Mary Meays <br /> April 17, 1995 (94-47-8620) <br /> If PID readings exceed 300 ppm v, work in and around the excavation will cease until <br /> emissions abate and levels drop to below 100 ppm v. The excavation may be covered with <br /> plastic sheeting if emissions do not readily disperse. Additionally, if the shutdown action level <br /> is reached, a one liter tedlar bag air sample will be collected from the downwind property <br /> boundary at the breathing zone using a diaphragm pump. The flow rate of the pump will allow <br /> a one liter sample to be collected over a two to five minute period (0.5- to 0.2-liters per minute). <br /> The sample will be analyzed for volatile organic compounds by EPA Method 8240. <br /> These action levels have been chosen to reduce potential off-site impact of emissions and <br /> protect on-site personnel from respiratory hazards associated with volatile petroleum <br /> hydrocarbons. Action levels were established after review of Rule 1166 from the South Coast <br /> Air Quality Management District, recommendations of the American Conference of Governmental <br /> Industrial Hygienists, and input from the San Joaquin Valley Unified Air Pollution Control <br /> District. Respiratory protection for working personnel is discussed in the site-specific safety plan <br /> which will be kept on site at all times. <br /> We appreciate the interest of the SJCPHS/EHD in the site and trust this letter meets your <br /> requirements. If you have any questions, please contact us at (916) 782-2110. <br /> Sincerely, <br /> FUGRO WEST, INC. <br /> '(ERE <br /> D. Robertson �t;�c' PVL Glb,y���n,� <br /> Pro' t Geologist <br /> 1T/J No. 5600 <br /> ,haul Graff ExP. 6/30/95 <br /> Senior Geologist P <br /> CRG No. 5600 9 «� <br /> �CF CAl\F�' <br /> Dat <br /> CDR/PKG:sh <br /> Attachments <br /> cc: E. Thayer, Central Valley Regional Water Quality Control Board <br /> D. T. Kirk, Shell Oil Products Company <br /> J. Byram, Shell Oil Products Company <br /> R. Henderson, American Construction <br /> 94478620.ELT -2- <br />