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i <br /> i <br /> I <br /> i <br /> 4 . Lab analyses method 5020 (he dspace) was used instead of <br /> the requested method 5030 (purge nd trap) . As a consequence, <br /> PHS/EHD considers the soil investigation a screening y <br /> procedure. Headspace analyses may only be used to show that <br /> gross contamination does not exist; it may not be used to <br /> prove "ND" conditions at this site. <br /> The enclosed Regional Water Quality Control Board (RWQCB) comments <br /> and the PHS/EHD recommendations listed above should be addressed in <br /> a proposal for further assessment and' /or remediation. This work <br /> plan should include a comprehensive groundwater investigation. <br /> Submit this proposal to PHS/EHD by Ap it 26, 1990. In addition, a <br /> Problem Assessment Report should be submitted to our office by June <br /> 26, 1990. Refer to the Tri-Regional Board Staff Recommendations <br /> and the LUFT manual for guidance in pr paring reports/work plans to <br /> be reviewed by PHS/EHD and RWQCB. <br /> All proposals and/or reports submitt d must be accompanied by a <br /> Letter of Acknowledgement from the responsible party(ies) , (refer <br /> to the letter mailed to Gary Brophy b PHS/EHD on October 3 , 1989 <br /> for an example) . <br /> If you have any questions, contact Darlene Reuss, REHS, at (209) <br /> 468-3441. <br /> G <br /> Jogi Khanna, M.D. , M.P.H. <br /> // District alth officer <br /> on "Valino i, Director <br /> Environmental Health Division <br /> r <br /> RV/DR:nr <br /> Enc. r <br /> cc: CRWQCB, Central Valley Region <br /> 3443 Routier Rd. , Sacramento 95k7-3098 <br /> Attn: Gordon Boggs <br /> cc: Applied GeoSystems <br /> 4191-E Power Inn Rd. , Sacramento 95826 <br /> Attn: Keith Romstad <br /> cc: City of Manteca Bldg. Department <br /> 1001 W. Center, Manteca 95336 <br /> Attn: Bob Kelley <br /> P <br /> 4 <br /> 1� <br /> f <br />