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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD ATTACHMENT B CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. 91-25000 12 DECEMBER 1991 REVISION GENERAL ORDER FOR LAND DISPOSAL OF GROUND WATER FROM CLEANUP OF PETROLEUM FUEL POLLUTION INFLUENT MONITORING Influent samples shall be collected after the last connection before the wastes enters the treatment process. Influent samples snould be representative of the volume and nature of the influent. Time of collection of a grab sample shall be recorded. The following shall constitute the influent monitoring program: Constituents Type of Sampling Units Sample =requencv Total Petroleum Hydrocarbons mg/l Grab Benzene 4/1 Monthly Ethylbenzene Grab Monthly Toluene ug/1 Grab Monthly Xylene ug/1 Grab Monthly Lead (total )* ug/1 Grab Monthly u9/1 Grab Monthly EFFLUENT MONITORING Effluent samples shall be collected downstream from the last connection through which wastes can be admitted into the discharge. Effluent samples should be representative of the volume and nature of the discharge. Time of collection of a grab sample shall be recorded. The following shall constitute the effluent monitoring program: Constituents Units Type of Sampling Sample Fregs Specific Conductivitv umhos/cm Grab Monthly pH pH units Grab Flow Monthly pd Total Petroleum Hydrocarbons mg/ l Grablative Monthly Benzene ug/1 Monthly** Ethylbenzene ug/l Grab Monthly** Toluene Grab Monthly** Xylene �g/l Grab Monthly** y u9/1 Grab Monthly** Lead (total )* 4g/1 Grab Monthly** IT ead is in ground water. '* :) Analyses shall be conducted weekly for four consecutive weeks following initial discharge from the treatment system. 2) If any sample shows detectable TPH, Benzene, Ethylbenzene, Toluene, or Xylene, the 2iscnaroer snail 4mnediately resamnle and reanalyze the effluent for the detected constituent(s), and snail continue sampling the effluent on a weekly basis until the constituent(s) concentrations are below detection.