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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Steven T.Butler,Chair <br /> Winston H. Hickox Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/--rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 14 November 2000 S 'd L l f-df�00 <br /> t <br /> Ken Price <br /> Glenn Springs Holdings, Inc. <br /> 2480 Fortune Dr., Suite 300 <br /> Lexington, KY 40509 <br /> SUPPLEMENTAL SOIL AND GROUNDWATER SAMPLING REPORT, FORMER OCCIDENTAL <br /> CHEMICAL SITE—LATHROP, CA, Case#4397 <br /> We have reviewed the Supplemental Soil and Groundwater Sampling Report, dated 31 October 2000, as <br /> prepared by The Source Group, Inc. Based on our review, we concur with the analysis and conclusions of <br /> the soil and groundwater sampling results from the Waterloo Multilevel Groundwater Monitoring SystelnTM <br /> (Waterloo System). <br /> The objectives of this scope of work were to collect additional soil and groundwater data to: <br /> > Provide additional soil and groundwater data for quantification of the vertical distribution of residual <br /> contaminant mass contained in the soil column, or alternatively, confirm that the quantity of residual <br /> mass present in soil is insignificant; <br /> > Aid in quantification of the vertical distribution of dissolved-phase contaminant mass present within <br /> the central portions of the contaminant plume. These data will be used in conjunction with existing <br /> Site data to refine estimates of residual plume mass, and focus any future remedial efforts on the zones <br /> of highest impact; and <br /> > Provide additional data regarding the physical and chemical properties of the aquifer material. These <br /> data will be used to perform an evaluation of the potential applicability of in-situ plume reduction <br /> methods and provide an estimate of the retardation characteristics of the aquifer for use in predictive <br /> analysis of plume migration. <br /> We look forward to discussing this investigation and the relevance of the results in consideration of <br /> continued and future remedial actions at the site at the annual meeting to be held in Lathrop on 6 December <br /> 2000. <br /> If you have any questions,please contact me at (916) 255-3078 or schwabk(E)rb5s.swrcb.ca.aov. <br /> ff��' X444 .,/ <br /> A. SCHWAB <br /> Associate Engineering Geologist <br /> cc: Fran Anderson, DTSC, Region 1, Sacramento <br /> San Joaquin County Environmental Health Department, Stockton <br /> Paul Horton,The Source Group, Inc.,Walnut Creek <br /> Erik Friedrich, Project Manager, CRA Services, Stockton <br /> KAS:Oxy SupSoil&GW Sampling Rpt <br /> California En viron in en tal Protection Agency <br /> �a� ReeYcled Paper <br />