WORK PLANS - Laserfiche WebLink

Home Browse Search

Mr. Robert Jackson • -2- 1. 3 20 proximity to each other, which could be done quickly and efficiently, while minim i ng they 2012 transfer of contaminants between water-bearing zones. Central Valley Water Board staff concur with San Joaquin County and strongly recommend that CPS install well pairs near each other, with conductor casing used for the B-zone well installations, and not as nested wells within a single casing. Well Destruction Work Plan CPS proposes to destroy existing MW-2 by pressure grouting to the surface, and removing the well vault. MW-2 contains pollutants, and San Joaquin County regulations require that wells that contain pollutants have their contents removed. Pressure grouting does not remove the well contents, so another destruction technique must be employed. CPS must provide a revised well destruction workplan that achieves the objective of removing the contents. This revised well destruction work plan may be provided electronically, and needs to include a boring log for MW-2 and a diagram identifying the location of MW-2. Treatability Study CPS proposes to conduct a bench-scale treatability study to evaluate various amendments that may be effective at removing 1,2,3-trichloropropane from groundwater insitu. When the design of the treatability study is formulated, CPS should transmit a study design to Central Valley Water Board staff for review. Soil and groundwater sampling from the proposed monitoring wells include parameters for the treatability study design such as porosity, bulk density, organic carbon content, oxygen, nitrogen, dissolved and total iron, hexavalent chromium, and phosphate. In order to assess total oxidative or reductive demand, CPS should also include analyses for dissolved and total manganese, and sulfate. General Order for InSitu Remediation As Rubik suggests, the General Order for InSitu Remediation (R5-2008-0149) may be suitable for permitting of oxidizing or reducing conditions, with or without recirculation systems. After the treatability study has demonstrated which amendments have a likelihood of success with the site pollutants and the site aquifer materials, then CPS may apply for coverage by submitting a Remedial Action Plan describing the insitu proposal, and a Notice of Intent. The Remedial Action Plan, Notice of Intent, or additional submittals should include the following items: • A check written to the State Water Resources Control Board and delivered to Central Valley Water Board staff for the amount of$3,422. • The North American Industry Classification System (NAICS) code of the industry that originated the pollution. • The targeted concentration of amendment(s) in the aquifer at the point of injection. • An analysis of the amendment(s) at the targeted aquifer concentration for volatile organic compounds, semi-volatile compounds, metals, general minerals, and TDS. • Geologic cross-sections (reference to documents that contain cross-sections is satisfactory).