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Mr. Paul Supple <br /> Arco Station No. 5469 <br /> 130 S. Wilson'Way, Stockton ; <br /> Page 3 of 3 ; <br /> `r Can the extent or frequency of the analytical regime for either contaminant <br /> concentration or natural attenuation parameters be reduced in some or all <br /> wells and still allow effective detection of significant changes in the plume <br /> migration and concentration changes and remediation system evaluation? <br /> EHD will review and evaluate recommended modification to the analytical <br /> regimen and/or remediation system based ion your evaluation and SCM. Report <br /> the evaluation in the SCM. <br /> Questions o:r comments may be directed,!'to Nuel Henderson by telephone at <br /> (209) 468-3436, or by mail to the address on the letterhead. <br /> } <br /> n; Donna Herah, REHS, Director <br /> E! <br /> Environmental Health Division <br /> �i !E <br /> Nuel C. Henderson, Jr., PG '+ Margare Lagono, REHS <br /> Unit IV - Site Mitigation R Supervisor, Unit IV <br /> ;! cc: James L. L. Barton — CVRWQCB <br /> E <br /> Jay R. Johnson — Stratus <br /> Greg Stahl -- Ground Zero Analysis, Inc. <br /> Tim Cuellar—Advanced GeoEnvirorimental, Inc. <br /> t r <br /> F. <br /> i L <br />