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t well flow rates; total and individual air sparge well injection flow rates; induced vacuum <br /> responses recorded in observation wells; all other relevant field data collected; and results <br /> obtained such as observed radius of influence, system destruction efficiency, etc. A <br /> minimum of four copies of the' report shall be produced for submittal to the City of <br /> Stockton, PHSIEHD, the SJVUAPCD, and the Regional Water Quality Control Board — <br /> Central Valley Region (RWQCB)' <br /> Section 10.10 Quarterly Groundwater Monitoring and Reporting <br /> Groundwater monitoring of an estimated seven wells shall be conducted on a quarterly <br /> basis. The scope of work to be performed includes measuring depth to water in all <br /> wells, purging a minimum of three well casing volumes from each well, and allowing pH, <br /> temperature, and electrical conductivity to stabilize prior to sample collection. Samples <br /> shall be placed on ice and submitted to a State-certified laboratory Y to be analyzed for <br /> f <br /> BTEX by EPA method 8020, total petroleum hydrocarbons as gasoline (TPHg) and total <br /> petroleum hydrocarbons as diesel (TPHd) by EPA method 8015m, and oxygenate fuel <br /> additives by EPA method 8260. <br /> Monitoring well purge water shall be discharged to the sanitary sewer under an existing <br /> permit. A monitoring report shall be prepared summarizing the results. A minimum of <br /> three copies of the report shall be produced for submittal to the City of Stockton, <br /> PHSIEHD, and the Regional Water Quality Control Board -- Central Valley Region <br /> (RWQCB). <br /> Monitoring shall be performed for four quarters during operation of the remediation <br /> system and for two quarters after system shutdown. Monitoring results from the post- <br /> operation quarters will be used: by PHSIEHD to determine whether the site may be <br /> closed. If additional, contingency operation and monitoring is required, it will be added <br /> before system shutdown. <br /> Section 10.11 Confirmation Soil Borings <br /> When it has been determined that the remediation system is no longer efficiently reducing <br /> petroleum hydrocarbon concentrations in sail and groundwater, a request shall be <br /> submitted to PHSIEHD that the:remediation system be shut down and post remedial <br /> monitoring be initiated. Post remedial monitoring shall include collecting groundwater <br /> samples from all monitoring wells as described in Section 10.07, advancing four <br /> confirmation soil borings to an estimated 30 foot depth, and collecting soil samples every <br /> five feet for field monitoring with a flame ionization detector or similar and for determining <br /> lithology. Two soil samples from:each boring shall be placed on ice and submitted to a <br /> State-certified laboratory for analysis of TPHg and TPHd by EPA method 8015m, BTEX by <br /> EPA method 8020, and fuel oxygenates by EPA method 8260. If analytical results <br /> indicate that petroleum hydrocarbons have been reduced to ' levels acceptable to <br /> PHSIEHD, a closure request report shall be prepared. <br /> Section 10.12 Closure Request Report <br /> A Closure Report shall be prepared in accordance'.with the Tri-Regional Board Staff <br /> Recommendations, Appendix B, the Central Valley Regional Water Quality Control <br /> Board (RWQCB) request for closure report contents. The contents of the report, at a <br /> minimum, shall be as follows: <br /> 1) A discussion of all items found on the RWQCB checklist in Appendix B. <br /> SP11 <br />