Minutes & Attachments - Marine Corps Base Camp Pendleton

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if the remediation approach for the site would be more aggressive or passive. Ms.Morley said that the hottest spots in the source areas would likely have more aggressivetreatment, and that the more dilute areas outside the source areas may have lessaggressive treatment. There was discussion of several possible treatment options. Dr.Mabey mentioned that thermal remediation was not on the list in the presentation, andnoted that at a recent conference there were interesting results with thermal remediationcombined with persulfate. Dr. Oslick noted that 1,2-dichloroethane (DCA) is arecalcitrant compound, and that naturally high sulfate in groundwater complicates theuse of bioremediation. There was also a brief discussion about the possible use ofthermal remediation at the site, but it was noted that the energy costs for thermal arehigh, and that renewable energy sources will be evaluated.Path Forward for IR Site 33 (52 Area Armory)Ms. Morley summarized the status of Site 33 and the planned approach going forward.The worst of the plume was removed by excavation, and now soil gas will be sampledunder the gun cleaning pad at a depth of 3-6 feet below ground surface to addressvapor intrusion risk. The soil gas sampling cannot be done until mid February due toutility clearances, but if the readings are high, additional excavation may be needed.Ms. Morley noted that if additional excavation is needed, the actual remedy will notchange, but just the footprint. Mr. Hausladen asked if the costs will change substantiallyfrom the Engineering Evaluation/Cost Analysis (EE/CA), and Ms. Morley said that theywill not because the original work came in under that estimate. Mr. Hausladen said thatit may be possible to do an addendum to the Action Memorandum since there are nonew contaminants of concern or difference in approach. It will need to documentchange in site boundary. But, he will check with EPA legal to determine if a differentapproach is needed. Mr. Mahmoud indicated that DTSC would likely be agreeable withwhat the EPA comes up with regarding the needed documentation. Ms. Prowell saidthat an addendum to the Action Memorandum should be appropriate given that furtheraction would still be within the estimated budget. The Team agreed that they are opento this planned modification, but will await the review of the new data to reach finalagreement.Path Forward for Site 1116Ms. Morley noted that the highest concentrations of TCE at Subsite 1491 are in adifferent location than as shown in the Action Memorandum. In the interest ofstreamlining the process, she is proposing that an addendum to the ActionMemorandum be prepared to show the changed location of the planned cleanup action.Mr. Hausladen said that the Navy should send a letter documenting the change and theplanned location.There was also discussion about how the Site 1116 subsites have petroleumcontamination as well as Comprehensive Environmental Response, Compensation, andLiability Act (CERCLA) contaminants. Ms. Prowell agreed with Ms. Morley that it wouldbe helpful to get the sites, or portions of sites, that have petroleum contamination backinto the UST program. The remaining subsites (14112, 1491 and 140008) may becomea new site so IR 1116 could be closed.Page 4 of 5
Schedule for Next FFA MeetingThe next FFA Meeting is scheduled to be held at MCB <strong>Camp</strong> <strong>Pendleton</strong> on May 16,2013.Page 5 of 5
Page 4 and 5: Ms. Prowell announced that she will
Page 8: MCB Camp Pendleton109 th FFA Meetin
Page 13 and 14: groundwater, however, additional wo
Page 15 and 16: Site 1118 - 21/26/52 Area Groundwat
Page 17 and 18: MCB Camp Pendleton Deliverables Spr
Page 19 and 20: Date: 1/17/13RTC ApprovedItem Docum
Page 21 and 22: • Site 7 - Revegetation• Site 7
Page 23 and 24: MCB CAMP PENDLETON22/23 AREA GROUND
Page 26 and 27: MCB CAMP PENDLETONSITE 21PILOT STUD
Page 28: Injection Details:Site 21 Pilot Stu
Page 31 and 32: IR SITE 1116 PHASE I & II SISubsite
Page 33 and 34: IR SITE 1116 PHASE I & II SIPhase I
Page 35 and 36: IR SITE 1116 PHASE I & II SIGroundw
Page 41 and 42: SOUTHWEST DIVISIONMCB Camp Pendleto
Page 43 and 44: I. Background InformationFormer UST
Page 45 and 46: II. Extent of Contamination -Recent
Page 47 and 48: II. Conceptual Target Treatment Zon
Page 49 and 50: II. Conceptual Target Treatment Zon
Page 51: III. Technology Screening/Alternati

Minutes & Attachments - Marine Corps Base Camp Pendleton

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