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0, X16 255 3715; Apr-29-99 10:40; Page 2 3 <br /> v'-I <br /> California Regional Water Quality Control Board <br /> 1 Central Valley Region <br /> Steven T.Butler,A(:ring Chair <br /> win:tnn H.HicknI Gray Detre <br /> Sacramento Mala orate <br /> E,rvt.onerenm7 lmeanet AAamn: Aep:!/www.mrb.mgav/-wQebS '��Trnc. <br /> Proxcnan 3443 Reuty Roo;Sift A,Swminava,CoMmia 95927.3oo3 <br /> Phvoe(916)255-3000-FAx(916)2$5-3015 <br /> 26 April 1999 <br /> Mr.Patrick D.Riddlc <br /> Attorney at Law <br /> 7574 Shoreline Drive <br /> Stockton,CA 95219 <br /> PROPOSAL FOR GR0UNDWATER REMEDL4 TION A T UCTOR FVVE FOODS,14N JOA QUIN <br /> corlwTy <br /> We met with you and your consultant on 15 March 1999 to discuss the new groundwater data collected <br /> at the site and your proposal for groundwater remediation using natural attenuation. You asked us to <br /> provide you with staffs impressions of this information. This letter does so. Due to the past public <br /> interest in this site, we are also providing copies to various interested parties, as you will see below. <br /> During a recent telephone conversation,our staff counsel,Loa Senitte,informed you that we would be <br /> doing so. <br /> At the 15 March 1999 meeting,you indicated that you were rep:--senting the Gochring family and that <br /> the data(provided in a drat report)and the natural attenuation proposal (based on discussions at the <br /> meeting)were generated to determine the feasibility of purchasing this property at a May 1999 tax sale. <br /> We are encouraged by the Gochring's interest in this property and would like to work with you,or any <br /> other party interested in the site,to develop a cleanup approach that is both protective of water quatiry <br /> and realistic. However,neither the data nor the proposal enables us to determine if natural attenuation is <br /> a-iabie remedial alternative at this site. To determine whether a natural attenuation option would be <br /> acceptable at this site,we would need the following information: <br /> • The vertical and late.-al extent of the phtme needs to be defined. <br /> • Evaluation of the individual monitoring well constituent trend analysis in the draft report was <br /> incomplete. A discussion of the effectiveness of the groundwater extraction and reiniection system <br /> should be included. Concentration trends near the extraction area versus outside the capture zone <br /> should be compared. <br /> • An estimate based on soils data of additional inputs of contaminants from the soil column to <br /> groundwater. <br /> • Discussion of the natural attenuation mechanisms working at this site and an estimate of when the <br /> groundwater will meet background or established watts quality objectives. <br /> Caltfbrnia Environmental Protection Agency <br /> 0 Rac)vkd Aver <br />