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4707 Pacific Ave <br /> September 1997 <br /> Page 2 <br /> 32.26 feet bgs. Additionally, according to this quarterly report, in January 1997 the total depth of VW2 <br /> was 37.49 feet bgs and in July 1996 the total depth of VW2 was 39.27 feet bgs . A similar condition is <br /> noted for V W3 and V W4. It is entirely possible that the recoveries reported in the last vapor extraction <br /> system report may be related to the condition of the vapor extraction wells.A joint inspection by <br /> PHS/EHD and Unocal's representatives should be scheduled immediately to assess the condition of <br /> VW2. Given this recent evaluation of the vapor extraction system's well configuration, PHS/EHD <br /> hereby directs you to either include soil borings in the work plan which is due or to submit an addendum <br /> by October 16 1997,to assess the remedial progress achieved by the operating vapor extraction system. <br /> PHS/EHD requested previously that depth to water measurements be included on the analytical results <br /> summary table. Instead the groundwater elevation measurements are included. Since screened intervals <br /> have been measured from grade,dept to et s andeptheasier <br /> to water measurements that have beeto use for �son. <br /> Please update the analytical summary table w <br /> collected. <br /> The telephone messages,which were passed from PHS/EHD and yourself,between September 5, 1997 <br /> and September 11, 1997, indicated that you wished to have an extension for to September 12, 1997 date <br /> for submission of a work plan which was established by PHS/EHD in correspondence dated August 13, <br /> 1997. PHS/EHD informed you,via a phone message,that extensions of due dates are generally <br /> requested in writing. An extension will not be granted,PHS/EHD has directed Unocal to submit the <br /> work plan to install replacement wells since March 1996. PHS/EHD has not received the required work <br /> wells which may also include soil <br /> wells must be plan for the <br /> by Septembert29, 1997 t avoid further enforcement ngs /or air sparge <br /> actions. <br /> If you have any questions,comments or to schedule a field inspection,please contact me at(209)468-0337. <br /> Donna Heran,REHS, Director <br /> Environmental Health Division <br /> V <br /> Mary Meays, Senior REHS Margare Lagorto,REHS <br /> Supervisor <br /> Site Mitigation Unit <br /> cc: Elizabeth Thayer,Central Valley Regional Water Quality Control Board <br /> cc: David Irey, San Joaquin County Deputy District Attorney,Environmental Prosecutions Unit <br /> cc: Greg Gurss,GeoStrategies <br /> cc: Haig,Tejirian,MPDS <br />