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Mr. Mendes <br /> July 26, 1999 <br /> Page 2 <br /> The ATC requires a minimum VOC control efficiency of 95%, For the five constituents of <br /> concern, the results were as follows: <br /> t <br /> Influent Effluent j <br /> (mg/m' m Im3 Control Efficiency (%) <br /> Purgeable <br /> Hydrocarbons 4960 23.5 99.53 <br /> Benzene 109 0.05* 99.95 <br /> Toluene 650 0.05* 100.00 <br /> Ethylbenzene 148 0.05* 99.97 <br /> Xylenes 560 0.05* 99.99 <br /> Constituent was not detected. Value shown is 1abo.ratory detection limit. <br /> From the figures shown above, the system has an overall efficiency of 99.63% for the Jive <br /> constituents of concern. This value is well above the stated minimum efficiency shown in the <br /> ATC. Therefore, the system is in compliance. <br /> Please contact the undersigned at (916) 362-7100 if you have any questions or comments. <br /> Sincerely, <br /> ENSR <br /> Doyle Kim <br /> Staff Specialist <br /> Mark Naugle, P.E. <br /> Project Manager <br /> DK:MN:em <br /> E <br /> f <br /> Attachments <br /> cc: Albert Vigil, San Joaquin Catholic Cemetery <br /> Joe Ramage, Ramage Environmental _ <br /> Harlin Knowll, San Joaquin County Environmental Health ; <br /> L AE N SR18728100118728001.B LT.d oc <br />