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M <br /> r <br /> Mr. Marshall Cloud <br /> March 22, 2007 <br /> Page 3 <br /> 7.) Page 3-2, section 3.2.1.6, third sentence; The TCE concentration found in <br /> ground water at 21 feet below ground surface at Site P-5A was documented <br /> as1,350 pg/L rather than 1,300 pg/L. Please correct the TCE concentration <br /> in the annual report for consistency. <br /> 8.) Page 3-8, section 3.2.5.8, third sentence; The TCE plume in the North <br /> Balloon migrated approximately 20 feet vertically downward between <br /> 2005 and 2006. DTSC is concerned that the TCE plume's vertical migration <br /> in this area may be a result of the strong hydraulic influence caused by <br /> intense pumping from potable wells (PW) PW020 and PW019 used by the <br /> Lifetile Company and Diamond Pet Food Company, respectively. The TCE <br /> plume in the North Balloon should be monitored closely using both ground <br /> water analytical data along with the numerical ground water model to help <br /> predict or identify areas of incomplete capture. <br /> 9.) Page 3-9, section 3.2.5.13; The report indicates that DDJC-Sharpe's PW038 <br /> used for the base water supply may be drawing a portion of the TCE plume in <br /> the North Balloon vertically downward towards its well screen. PW038 <br /> should be sampled quarterly for VOCs to insure DDJC-Sharpe's potable <br /> water supply contingency plan is not violated by purveying TCE contaminated <br /> water to receptors with concentrations greater than the State of California <br /> maximum contaminant level. <br /> 10.) Page 3-11, section 3.3.2.1; The results of the confirmation sampling at <br /> Site S-26 were previously submitted to the agencies for review and approval. <br /> This section should be updated to reflect the current status of Site S-26. <br /> 11.) Page 3-15, table 3.1-1; In the final report, please indicate whether <br /> corrective actions have been taken to sample the wells and if not, when they <br /> are planning to be sampled to fulfill the monitoring requirements. <br /> 12.) According to section 3.4.2.1 of the Final June 2002 Remedial Action <br /> Report for Institutional Controls (ICs) at the South Balloon Area, an Annual <br /> Inspection Report documenting the condition of the ICs; any land use <br /> changes; operational activities; or construction activities that have occurred <br /> during the year at DDJC-Sharpe and that may have impacted the <br /> effectiveness of the ICs should be documented and submitted annually as <br /> Appendix B of the Annual Progress Report. Currently, DTSC is unaware that <br /> DDJC-Sharpe has submitted the Annual Inspection Reports as part of the <br /> Annual Progress Reports. DDJC-Sharpe should complete the Annual <br />