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J. <br /> ENVIRWMENTAL HEALTH'DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K.Heran,R.E.H.S. Unit Supervisors <br /> Director <br /> 304 East Weber Avenue, Third Floor Carl Borgmi' an,R.E.H.S. <br /> Mike Huggins,RT.H.S.,R.D.I. q <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> Ti. Program Manager <br /> Telephone: {209) 468-3420 Margaret L41gorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. F ax: (209) 464-013 8 Robert McClellon,R.E.H.S.Program Manager Mark Bar&tlos,R.E.H.S. <br /> WILLIAM BERGVALL k, <br /> 2977 YGNACIO VALLEY RD " MAY 0 5 2005 <br /> WALNUT CREEK CA - 94598 <br /> 1,1; is <br /> ii <br /> RE: FORMER AMERICAN FOREST PRODUCT <br /> 2801 WEST LANE <br /> STOCKTON CA <br /> San Joaquin County Environmental Health Depattriient (EHD) has reviewed the Third and <br /> Fourth quarter 2004 Groundwater Moniforin eAorl dated <br /> March 3, 2005, and Additional 1,2- <br /> DCA Investigation and Site C onceplual Model and Second Quarter 2004-Groundwater Monitoring PepOrt <br /> dated February 18, 2005 (the reports) prepat6d by'but consultant, URS Corporation <br /> Y, <br /> Americas (URS) for the above-referenced site�`,. FouI quarterly samplings have.been <br /> conducted to 'investigate the site since the ins'Tallati6n of the two monitoring wells DMW-8 <br /> and DMW-9 in March 2004. I.,2-Dichloroeth..ane (1.2-DCA) has been consistently detected <br /> in the groundwater samples of DNIW-5, DMW-6, and DMW-9,which is the furthest down- <br /> gradient (north-northeast) monitoring well at the site. With the exception of September. <br /> I. !F <br /> 2004, 1,2-DCA has not been detected in the deepest monitoring well DMW-8 screened at'80 <br /> feet below surface grade (bsg). Tetrachlotoethene (PCE) has also been detected in DMW--9, <br /> but has not been detected in any other wells.JLJTotal'petroleum hydrocarbons as diesel (TPH <br /> . m <br /> d) has decreased to non-detect level in all wefts. <br /> EHD does not agree with URS' request for site cloglure. The lateral extent of 1,2-DCA <br /> contamination plume has not been defined, especially' <br /> in the down-gradient direction of the <br /> groundwater flow. Additional investigation of the groundwater <br /> roundwater contanuination plume is <br /> required. Submit a work plan to EHD that will define the extent of the groundwater <br /> contamination plume by June 15, 2005. <br /> URS has concluded that because PCE has been found only in DMW-9 groundwater <br /> samples, the origin of the PCE release may not be on' -site. EHD has no comment on the <br /> conclusion URS presented at this time. EHE;i'is not-actively looking for any chemicals that <br /> can not be traced to underground storage tanks (US'l) as the source of release.' In a <br /> telephone conversation on May 3, 2005, California Regional Water Quality Control Board. <br /> (RWQCB) concurred with EHD that PCE should continue to be reported only to fulfill the <br /> report all peaks" of the 8260B analyses requi emcnt. EHD is not requiring further <br /> -investigation of the PCE found in DMW-9 samples at this time, but PCE and other peaks in <br /> 8260B analyses should continue to be reported. <br />