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I <br /> Advanced <br /> GeoEnvironmental, Inc. <br /> 23 March 2006 <br /> AGE-NC Project No. 98-0511 <br /> Mr.Michael Infurna <br /> San Joaquin County Public Health Services-Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,CA 95201 <br /> Subject: Work Status Notification <br /> LANGSTON'S MARKET <br /> 15615 South T° Street,Lathrop,California <br /> Dear Mr. hifurna: <br /> As stated in the Advanced GeoEnvironmental,Inc.(AGE)letter dated 09 February 2006,the AGE-prepared <br /> Additional Site Assessment Work Plan,dated 30 September 2005,could not be completed due to financial <br /> hardship on the part of the client,Mr.James Langston;the additional assessment on Union Pacific Railroad <br /> property could not be completed without additional, non-reimbursable funds required by the railroad to <br /> perform work on its property.However,AGE has proceeded with completion of corrective action plan(CAP) <br /> that will be based on a site conceptual model that is constraint by all available geologic and hydrogeologic <br /> data dating back to 1991.In the site conceptual model,AGE will include arguments for a maximum easter <br /> limit of lateral soil contamination, show trend analyses of declining contaminant concentrations over time <br /> and projected contaminant-level compliance dates,and provide a fate and transport model. <br /> At the present time,most of the modeling work has been completed;however,to better constrain the fate and <br /> transport model,AGE is recommending performance of a slug test at several of the site monitoring wells to <br /> acquire hydraulic conductivity data. Once the additional data has been acquired, AGE anticipates that <br /> completion of the CAP would require an additional one to two weeks to complete determination of remedial <br /> alternatives and writing of the CAP;AGE will submit the CAP before 01 May.2006. <br /> If you have any questions or require further information,please contact our office at(209)467-1006. <br /> Sincerely, ONJOAMMCOLMY <br /> 041ROWMALVOLTHOMMMOW <br /> Advanced GeoEnviro_ 1,Inc 3MEWEINE1lAWTHIRD FLOW <br /> CA4Vtf' } 1 ✓�fCCKfON�f6lOE <br /> * eta;73Lf gpppyM <br /> Calvin F.Lee t1` AppONOW11111M11111111111 M <br /> Senior Project Geologist } <br /> Rem ft r...w.ww .+�■f■ <br /> cc: Mr. James Langston w <br /> ApprOinleAwfto*fAp1*4AbdlownaaddMeM/ <br /> 837 Shaw Road.Stockton,Cal" t�W.I b does ttpt Now P I WIN "I WV 111 @"*r. <br /> Telephone(209)�IG7-.1006 Pas �9�a4`�rl .}S equirements of state Ime or kwal otdirmim. <br />