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Joe Lentini - 2 - 13 August 2008 <br /> i <br /> DTSC provided review comments for Neighborhood D Areas 4 and 5 where Mountain House <br /> High School is planned for construction. DTSC's general comments requested that all <br /> groundwater investigations be incorporated into a comprehensive report on the extent of <br /> groundwater contamination on the proposed school site. DTSC also recommends moving one <br /> of the proposed down-gradient monitoring wells from each of Areas 4 and 5 to locations up- <br /> gradient of the former pipeline alignment. DTSC also recommends collecting soil gas samples <br /> at 5 and 15 feet bgs in one of the proposed down-gradient well locations. DTSC is concerned <br /> that previous soil vapor samples may have been collected too soon following the soil removal <br /> activities for vapors to equilibrate in the source area. A copy of DTSC's review comments is <br /> attached. <br /> Regional Water Board staff concurs with the proposed scope of work outlined in the Work <br /> Plan with the addition of the soil vapor samples and monitoring well location adjustments <br /> requested by DTSC. In addition, Regional Water Board staff requests that soil and <br /> groundwater samples be analyzed for naphthalene and sulfur compounds (such as sulfate and <br /> hydrogen sulfide) or that a discussion be provided of the potential occurrence of these <br /> constituents in the crude oil contamination and whether their additional analysis is necessary. <br /> The report for the proposed scope of work is due to this office by 14 November 2008. Provide <br /> a revised Figure 3 for review and concurrence before the start of field activities. Provide at <br /> least one week notice of the field schedule prior to commencing field activities. If you have <br /> any questions regarding this letter, you may contact me at (916) 464-4665 or by email at <br /> ncasebeer@waterboards.ca.gov. <br /> Nathan Casebeer, P.G. <br /> Engineering Geologist <br /> Private Sites Cleanup Unit <br /> Attachment <br /> cc: Ms. Kamili Siglowide, Department of Toxic Substances Control, Sacramento <br /> Mr. Jeff Gaarder, Conestoga-Rovers & Associates, Sonoma <br /> Mr. Mike Infurna, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Manuel Oliveira, Escalon <br /> Mr. Duane Grimsman, Trimark c/o Sterling Pacific Assets, Roseville <br /> Mr. Alex DeWitt, Condor Earth Technologies, Inc., Stockton <br /> Mr. David Sargent, Shea Homes, Livermore <br /> NEC/W\slic doMAustin Staff\Nathan\Shell Mountain House\6-17-08 Shell Mtn House C-D MW WP.doc <br />