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ATTACHMENT B CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD 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 should 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: Type of Sampling Constituents Units Sample Frequency Total Petroleum Hydrocarbons mg/l Grab Monthly Benzene Ag/l Grab Monthly Ethylbenzene Ag/l Grab Monthly Toluene µg/1 Grab Monthly Xylene µg/l Grab Monthly Lead (total)* ug/l 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: Type of Sampling Constituents Units Sample Frequency Specific Conductivity pmhos/cm Grab Monthly pH pH units Grab Monthly Flow gpd Cumulative Monthly Total Petroleum Hydrocarbons mg/l Grab Monthly** Benzene µg/l Grab Monthly** Ethylbenzene µg/l Grab Monthly** Toluene isg/l Grab Monthly** Xylene µg/l Grab Monthly** Lead (total )* k1g/1 Grab Monthly** ' If leadis in ground water. ** 1) 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 Discharger shall immediately resample and reanalyze the effluent for the detected constituent(s), and shall continue sampling the effluent on a weekly basis until the constituent(s) concentrations are below detection.