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1 1 • <br /> Ross R. Grunwald, Ph.D. <br /> 1 <br /> Consulting Geologist <br /> 19787 Dambacher Drive P.O. Box 3446 Sonora, CA 95370 <br /> June 26, 1992 <br /> Ms. Margaret Lagorio <br /> Senior Environmental Health Specialist <br /> San Joaquin County Public Health Services Rm E I V E D" <br /> P.O. Box 2009 J u L 0 1 9992 <br /> Stockton, California 95201 <br /> ENVIRONMENTAL H£ALTh <br /> Dear Ms. Lagorio, <br /> PERMIT/SERVICIS <br /> I have reviewed the air quality permit application for a soil vapor <br /> extraction system, dated June 15, 1992, for the Royal Oak Savings and <br /> Loan project, 510 North Main Street, Manteca, Calzfonria, submitted by <br /> WHF Environmental Consultants, Inc. <br /> MW-2, which will be used as the extraction well in this proposal, was <br /> A,installed by another consultant and the details of well construction are <br /> not available in WHF files. However, if the well was constructed <br /> according to accepted procedures, screened casing would extend from <br /> the bottom of the well (30 feet) up to a depth of ten or fifteen feet <br /> below the surface This would give approximately eight to thirteen feet <br /> of perforated casing above the water table as determined on the 4/09/92 <br /> monitoring event. <br /> A vapor extraction test conducted on MW-2, using an EG&G Rotron <br /> model DR 505 pump, on 5/29/92 demonstrated that significant quantities <br /> of contaminants were extracted in the vapor pulled from the well (see <br /> Appendix C in application) . This is the pump that will be used to <br /> operate the system once it is installed. <br /> I concur with the work plan as proposed in the application and affix my <br /> signature and seal to this letter as confirmation of my approval of the <br /> above referenced application <br /> Sincerely, 5���k� GF�1p <br /> oz <br /> `< ® Ross R Grunwald 0 <br /> 3948 <br /> Ross R. Grunwald, Ph.D. �►� _�� <br /> Consulting Geologist O� <br /> OF ca��F <br /> Telephone (209) 532-8021 Facsumle (209) 532-3809 <br />