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. Paul Supple, ARCO #2130 page 2 7906 N EI Dorado St , Stockton i The only time the SVE wells were groundwater sampled was in May 1997 and petroleum concentrations were high EHD will require all wells associated with this site (i e MW, VW, MS, AS etc)with groundwater in them to be sampled and analyzed for petroleum and oxygenates This is to begin at the next quarterly sampling event and continue until changes are approved by EHD Based on the information from these wells, ARCO is to evaluate the need to install additional wells to adequately monitor the groundwater or extract vapors Additionally, MW-10 has been reported as "inaccessible" since September 12, 2001 Hammer bane road construction activities have been concluded for some time now and still the well has not be located, repaired, or monitored as required by EHD Please take immediate steps to find and return this well to active status If the casing is beyond repair or is now in a location that does not allow for safe monitoring and sampling, please provide a work plan in a timely manner to destroy and replace it This site entered into active remediation before many regulatory investigative changes for underground storage tank (UST) sites were enacted Most of the changes since 1994 have provided responsible parties and regulatory agencies with better methods to characterize, evaluate, and remediate releases associated with leaking USTs One of the most helpful and useful requirements is the preparation and updating of the Site Conceptual Model (SCM) This document provides for an in-depth modeling of the subsurface and is added to as additional information and data is obtained it is very useful in understanding the petroleum impact and transport and allows for a detailed design of any needed remedial system ARCO is to provide a SCM for this site In addition to the latest groundwater analytical data collected from all the wells at this site, the SCM should provide you with a better picture of the subsurface and the areas of the site in need of further investigation or remediation You may contact Michael infuma at (209) 468-3454 if you have any questions or wish to discuss this letter Donna Heran, RENS, Director ;Enviro ental Health D n G�A 1 Michael J Infurn Jr , Senior REHS Margaret Lagono, REHS _ LOP/ Site Mitigation Unit IV Supervisor MI/ • c CVRWQCB— Marty Hartzell, Sacramento c SWRCB—CUF -- Mark Owens, Sacramento c ,Stratus Env --Jay Johnson 3330 Cameron Park Dr, #550, Cameron Pk, 95682 c URS Corp —Vern Elarth 2870 Gateway Oaks Dr, #300, Sacramento, 95833