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tF <br /> _ PUBLICII'tALTH SER-fltES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D , M.P.H., Health Officer ' <br />' 304 East WeberAvenue,Third Floor- Stockton, CA 95(C (OFly <br /> 2091468-3420 <br /> DOUG WESTERHAVER C/O �j <br /> JERRY G SULLIVAN AUG 0 3 WS <br />' KOHLBERG KRAVIS rx ROBERTS <br /> 3478 BUSKIRK AVE SUITE 1019 <br /> PLEASANTON CA 94523 <br />' Re Former American Forest Products Stockton Facility Site Code: 1882 <br /> 2801 N. West Ln. <br /> Stockton, CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has reviewed the file history and the groundwater level monitoring report dated January <br />' 28, 1998 submitted by Dames & Moore for the above referenced site. <br /> Reference was made in the above report to a Dames & Moore "Revised Proposal for <br /> Additional Technical Service Report"(dated August 27, 1996) PHS/EHD does not have <br /> this report. Please submit a copy of the report to this agency <br /> In a letter from PHS/EHD dated October 28, 1996, the plan for monitoring contaminants <br /> at this site was clarified. A five year groundwater monitoring plan was designed based on <br /> three assumptions by Dames & Moore. These assumptions were that groundwater would <br /> ' remain at a depth of 70 feet below surface grade (bsg) or lower, that Total Petroleum <br /> Hydrocarbons as Diesel (TPHD) would not impact groundwater, and that natural <br /> attenuation of the residual TPHD in soil would occur Groundwater has fluctuated from <br /> approximately 60 feet bsg in 1994 to a current depth of approximately 37 feet bsg on July <br /> 23, 1998 The trend of rising groundwater is of concern to PHS/EHD because of the <br /> possibility of groundwater contacting contaminated soils in this area. <br /> As stated in the PHS/EHD letter to you dated September 8, 1997, groundwater had risen <br /> over the Dames and Moore Monitoring Well (DMW) screens of DMWs 1 through 4. <br /> Currently groundwater is above the screens of DMW 1 through 5 Groundwater samples <br /> collected from 1995 to 1997 and analyzed for TPHD have not detected this analyte Since <br /> ' water is above the well screens the data may not be representative of groundwater <br /> conditions In order to confirm that groundwater is not contaminated additional MWs <br /> should be installed in the areas of previously documented high TPHD soil <br /> concentrations so the current groundwater/soil interface can be investigated. <br /> Prior to consideration for closure, further investigation and documentation is required for <br /> this site Calculations for natural attenuation of contaminants and the proposal for no <br /> further corrective action being necessary (as per the Dames and Moore Report <br /> ' A Division of San]oaquen County Health Care Services <br />