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PUBLIC HEALTH SERVICES ��A <br /> G <br /> SA\ fOAQL1\ COL Nn' r s{ <br /> N <br /> IOGIKHAN\AAl1) >IPH <br /> Health Officer . O P <br /> P O Box 2009 • (1601 East Hazelton Avenue) • Stockton Cahfortna 95201 a t 1 F Op , <br /> ' (209) 468 3400 <br /> ANN ARNEY <br /> 650 MANAGEMENT <br /> 2110 WALNUT HILL LN STE 260 '.SUN 0 3 1993 <br /> 1RVING TX 75038 <br /> RE Diamond Lumber SITE CODE: 2483 <br /> 151 S Main <br /> Manteca, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the <br /> "Quarterly Groundwater Monitoring"report dated April 1993 prepared by Steffen Robertson and Kirsten Inc <br /> (SRK) for the above referenced site <br /> In a letter dated January 22, 1993,PHS/EHD requested a site map showing the location of the 500 gallon tank <br /> and its piping and the other underground storage tank that was removed in 1985 Enclosed are copies of the <br /> Blymycr Engineers site map dated August 1990 and Gregg Drilling permit for the three Blymer monitoring <br /> wells As shown on these documents the tank excavation is near MW1 which is labeled BEI-MWS (MW3 in <br /> BE[) in the SRK reports Clarification of this information is necessary to assess where the most contaminated <br /> soil is and whether the plume of groundwater contamination has moved Currently the SRK reports are <br /> showing that the highest groundwater contamination in December 1989 was in BEI-MW6 (MW1 in BEI) and <br /> since the October 1991 samplings the highest groundwater contamination has been in BEI-MW5 (MW3 in <br /> BEI) This indicates the groundwater contamination plume has moved to the southeast If there has been <br /> a reversal in the labeling of these two wells then the groundwater contaminant plume has not moved Please <br /> clarify this in the next quarterly report <br /> Copies of correspondence between SRK and Southern Pacific on installation of a monitoring well on Southern <br /> Pacific's property has not been provided to PHS/EHD as requested in our January 22, 1993 letter Please <br /> provide the correspondence copies in the next quarterly report <br /> Additional monitoring well,;should be installed to delineate the extent of the soil/groundwater contaminants <br /> so that remedial alternatives can be discussed Please submit a work plan for this additional investigation by <br /> August 1, 1993 <br /> If you have any questions, contact Margaret Lagorio, Senior REHS, of my staff at (209) 468-3449 <br /> Jogi Khanna, M D , M P H <br /> Health Officer <br /> I <br /> i ulla r E S, rogram Manager <br /> vironmental Health Division <br /> AC/ML lb <br /> Enc <br /> it c RWQCB <br /> c Steffen Robertson and Kirsten Inc / <br /> A Ujvimon of San Joaquin(ounr, HcaiLh[art ��.v <br />