Laserfiche WebLink
Item Section Page Comment Response <br />3 2.1 2-1 It is unclear from the general description of activities in <br />this section if a UXO team will be involved in all intrusive <br />activities conducted under the Draft Addendum. If so, <br />revise this section to state qualified personnel trained in the <br />UXO identification, avoidance, and removal will be <br />involved in all intrusive activities. If not, CA ARNG needs <br />to explain how they determined these measures are not <br />necessary for the proposed intrusive activities. <br />Per our discussion, an UXO technician is not necessary for <br />this phase of the work. The text will be revised to more <br />clearly state why these measures are not necessary. <br />4 2.2.3 2-2 This section refers to proposed borings that are not shown <br />on a figure. Add these proposed boring locations to Figure <br />4. Also, CA ARNG needs to provide the rationale for <br />collecting samples at a depth of 10 to 15 feet below ground <br />surface (bgs). <br />Figure 4 will be modified to include the proposed boring <br />locations. The sample depth will be changed to match the <br />Field Sampling Plan in Appendix C, Section 4.0, and the <br />rationale for the selected depths will be provided. <br />5 2.3.3 2-3 Define the objective or objectives referred to in the last <br />sentence of the first paragraph. <br />The cleanup objectives will be California Regional Water <br />Quality Control Board — San Francisco Bay Region <br />Environmental Screening Levels (ESLs). These objectives <br />will be incorporated into the section. <br />6 2.3.3 2-3 The second paragraph states "the excavation will be <br />backfilled with suitable clean material from a local <br />source". There are areas of residual soil contamination at <br />the CA ARNG facility, so Regional Water Board staff <br />assumes this means the backfill will come from an off-site <br />source that has been shown to be clean through analytical <br />testing by a laboratory certified by the California <br />Department of Health Services. Revise this paragraph to <br />clearly describe the source of the backfill and any <br />information that can demonstrate that the proposed source <br />will provide clean backfill. <br />The backfill source has not yet been determined. The text <br />will be modified to state that only fill that has been tested <br />and documented as clean will be used. The Regional <br />Water Board staff will be provided with sources and <br />documentation prior to initiating excavation operations. <br />FOR OFFICIAL USE ONLY <br />28 March 2007 <br />Page 3 of 4