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5 <br /> PA71 MEMO'S <br /> Ila <br /> 0.5'MR, <br /> A <br /> In addition, analysis by the Permitee for benzene, toluene <br /> and xylene (BTX) will be required at frequencies coin- <br /> ciding with the sampling and analysis for total petroleum <br /> hydrocarbons. The BTA quantification will also be in <br /> accordance with Attachment 2. <br /> 3. Permittees will be allowed to discharge a maximum <br /> allowable concentration of 0.25 mg/l of volatile <br /> hydrocarbons. For purposes of this section, any <br /> hydrocarbon which exhibits a Henry's Constant greater than <br /> , . lG1,000 Asia/mole fraction will be considered volatile <br /> (spa Attachment 1 for an explanation of Henry's Constant <br /> ant, Attachments IA through 1C for associated calculations <br /> and information)- volatils hydrocarbons that do not <br /> exceed 0.25 mg/l in dissolved concentration will prevent <br /> - explosive atmospheric concentrations in the sewer. <br /> Monitoring will be at periodic levels coincidental to <br /> total petroleum hydrocarbons and BTA determination and <br /> will be obtained by the subtraction of the BTR fraction <br /> from the total petroleum fuel hydrocarbon result. The <br /> non-BTR fraction will be <br /> presumed to be volatile <br /> hydrocarbons that might produce an explosive atmosphere if r <br /> { in excess of 0.25 m <br /> g/3. <br /> 4• The discharger shall provide two lower explosive limit <br /> (LEL) monitors. One will monitor the discharge system <br /> prior to entry into the sanitary sewer and the other will <br /> monitor the sewer atmosphere at a manhole selected by the <br /> City downstream from, the discharge point. <br /> �. Each is to be calibrated in a manner that indicates the <br /> percentage of LEL of gasoline. Each will be connected to <br /> the facility in such a way that an alarm is triggered at <br /> 20% of the LEL of gasoline and that at 40% of the LEL of <br /> gasoline, the entire facility will be automatically shut <br /> down. The monitors are to be calibrated and maintained <br /> with a City approved quality assurance program that will <br /> yield accurate results. Each monitor will record the <br /> results of monitoring. If after a period of evaluation it <br /> is determined by the Director or his representative that <br /> continuous recording is no longer needed the provision of <br /> a recorder may be deleted, <br /> �» 5. The Director or his representative shall have access to <br /> the facility shutdown switch as well as copies of keys to <br /> all locked enclosures at the site and shall be provided <br /> access to the facility for purposes of inspection. <br /> 6. The discharger shall provide flow monitoring and recording <br /> equipment and sampling taps or equipment in order to <br /> comply with these rules. <br /> -2- <br />