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