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filtering continued until the results achieved the required discharge limits. Appendix C contains the laboratory reports for the filtered(effluent) samples and Appendix D contains the self-monitoring discharge reports that were submitted to the Sanitation District. Upgradient Environmental submitted the request for batch discharge on May 28. Two 5;000-gallon storage tanks had been mobilized to the site on May 22 to accommodate the larger volume of water that would need to be pumped in each batch discharge. 3.0 Constant Rate Test 3.1 First Batch The constant-rate test was initiated on June 1.A transfer pump cycled water through the carbon canisters and then into the storage tanks. On June 8, a third sample was collected. At that point, nearly 7,000 gallons had been pumped. By June 11,both.tanks were full and a fourth sample was collected (Table 1). Although the concentrations in the June 8 sample were higher than in the May 13 step- test sample, the concentrations in the June 11 sample were somewhat lower and were about the same as in the May 13 sample (Table 2). This indicated that there was basically no significant change in concentration after removal of about 10,000 gallons. The Sanitation District approved the first batch of stored water for discharge in mid-July and the tanks were emptied on August 3. A copy of the discharge permit is included in Appendix E. Thereafter,monthly reports were submitted to show that the required discharge limits were being achieved. The monthly reports included the laboratory reports for.the filtered samples (Appendix Q. 3.2 Second Batch Pumping resumed on August 4 and continued until.August 10,when the pump shut down unexpectedly. At that point,4,625 gallons were held in the storage tank(Table 1). The pump was restarted,but shut off again on August 14, so the test was suspended and a.new pump was ordered. While waiting for the new pump to arrive, the stored water was recycled through the carbon filters to remove any PCE/TCE that might be present, and the second batch of approximately 7,335 gallons was disposed to the sewer on September 9. An influent sample was collected on September 17 during regular quarter monitoring,but the results did not show a conclusive improvement from the second sample on May 13 (Figure 2). The graph shows that the TPH-g concentration returned to its original value, although BTEX concentrations were slightly lower(Table 2). 3