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A report of the investigation procedures and results will be <br /> prepared according to Regional Board guidelines. The field <br /> investigation will be conducted under the direct supervision <br /> of Russell W. Juncal, California Registered Geologist No. <br /> 3864, or Nora H. Kataoka, California Registered Civil <br /> Engineer No. 38322. The appropriate individual will also <br /> review and sign the assessment report. The report will be <br /> submitted to the San Joaquin County Public Health Services, <br /> Environmental Health Division and the Regional Water Quality <br /> Control Board for review and approval. If the investigation <br /> adequately demonstrates that leakage from the tank has not <br /> occurred, Phase II of the abandonment will be implemented <br /> after authorization from the County is received. If leakage <br /> has occurred, the investigation report would be submitted in <br /> the form of a revised workplan recommending additional <br /> investigative measures. <br /> 2 . 6. 2 Phase II Activities <br /> fig <br /> — Upon receipt of authorization from the County Public Health <br /> Services, Environmental Health Division, Phase II activities <br /> will be implemented. In Phase II, the tank will be emptied <br /> of all product and steam cleaned. All residual liquids will <br /> be removed by pumper truck and contained for appropriate <br /> disposal. The tank will then be filled with "Class B" <br /> concrete slurry ( 5 sacks cement per cubic yard) or cement- <br /> sand grout at a 2: 1 sand:cement ratio. The concrete or <br /> grout will be commercially mixed and pumped under pressure <br /> into the tank. <br /> Due to the presence of a reinforced concrete slab overlying <br /> the tank and piping, WaterWork proposes to abandon piping <br /> below grade by forcing concrete or grout through the piping <br /> and capping the pipes just below grade. All above-grade <br /> piping will be removed. If the piping cannot be filled with <br /> concrete, it will be removed. <br /> 2. 7 Tank abandonment final report <br /> After completion of all abandonment activities, a final <br /> letter report will be submitted to the Fire District, County <br /> Health, and the Regional Board. <br /> 5 <br />