SITE INFORMATION AND CORRESPONDENCE

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ORDER NO. 5-00-119 -6- INFORMATION SHEET GENERAL ORDER FOR DISCHARGE TO SURFACE WATERS OF GROUND WATER FROM CLEANUP OF PETROLEUM FUEL POLLUTION ATTACHMENT C Constituent Level Units Consideration Total Petroleum 100 µg/l Taste and Odor Hydrocarbons Benzene 0.35 . 4g/1 Humanhealth Toluene 42 µg/1 Taste and Odor Ethylbenzene 29 µg/l Taste and Odor Xylene :17 µg/l Taste and Odor Naphthalene 20 µg/1 USEPA Health Advisory Carcinogenic PAHs* 0.0029 µg/1 Human Health MTBE, 5 n/l Taste and Odor Ethylene Dichloride (1,2-Dichloroethane) 0.4 µg/1 Ca Public Health goal Ethylene Dibromide 0.0097 µg/i Human Health Tertiary butyl alcohol 12 µg/1 Ca DHS Drinking Water Action Level Methanol 3,5 00' µgJl USEPA ISIS ref dose Total Lead 2 µg/1 CA Public Health&CTR TDS 1000 mg/1 CA Drinlang Water goal *Polynuclear Aromatic Hydrocarbons;the sum of benzo[a]pyrene,benz[a]anthracene, benzo[b]fluoranthene,benzoUlfluoranthene,bmzoMfluoranthene,.&benz[a']acridine, dibenz[a h]acridine, dibemz[a h]anthracene,7H7dibenzo[c,g]carbazo1e,dib=o[a e]pyiene;dibenzo[a,hlpyrene, dibenzo[a i]pyrene, dibenzo[a l]pyrene,indeno[1,2,3-c,d]pyrene,5-methylehrysene,l-nitropyrene, 4-nitropyrene, 1,6-dinitropyrene, 1,8-dinitropyn=,6-nitrocrysene,2-mitrofluorene,and chrysene. The flow of wastewater from the groundwater treatment systems to be covered by this Order is generally less than 150 gallons per minute (216,000 gallons per day(gpd)). For the purposes of this Order, discharges less than 200,000 gpd will be considered to be low volume discharges. Discharges in excess of 200,000 gpd will not be covered by this Order. The monitoring program enclosed within this general permit has been set up for a typical groundwater extraction/treatment facility. The moiutoring program can be changed to.address site-specific concerns (sensitivity of receiving.waters,reliability of treatment unit, etc.)by issuing a separate Monitoring.and Reporting Program that either increases or decreases.the monitoring frequency. If the monitoring frequency is decreased, the monitoring program may need to be re-noticed and sent out for comments.