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76/former BP# 11192 page 2 <br /> 1403 Country Club Blvd, Stockton February 18, 2011 <br /> Subsequently, additional proposals were submitted by Stantec and the EHD determined that <br /> critical site-specific concerns were not being adequately addressed: The August 4, 20'10 <br /> proposal was denied on Geotracker and the most current proposal dated December 7, 2010 <br /> was reviewed by the EHD and found to be inadequate at addressing all of the EHD's <br /> groundwater plume definition and investigational concerns. <br /> In an attempt to minimize misunderstandings and to ensure the required investigative phase <br /> continues, the EHD discussed our concerns with Stantec Consulting. In full cooperation, <br /> Stantec has provided the EHD an electronic mail of their proposal and recommended a multi- <br /> phased approach that begins with one off-site Cone Penetrometer Testing (CPT) boring, CPT-4. <br /> The EHD is to be advised of the sampling results from this boring and is to be included in <br /> decisions for placing additional CPT borings and monitoring wells. The EHD concurs with this <br /> approach. However, ARCO's most recent proposal, Second Revision to Work Plan Addendum <br /> for Additional Site Assessment — December 7, 2090 is inadequate and is not approved as <br /> submitted. (H&S 25296.10(c)(3)). The proposed scope of work failed to include the monitoring <br /> well installations off-site to investigate_ the lateral extent of multiple depths of concern and did <br /> not include a deep monitoring well on-site to investigate the vertical extent of the groundwater <br /> contaminant plume. Therefore, to address all concerns and agreements, ARCO is to submit'a <br /> work plan that incorporates the details of Stantec Consulting's December 28, 2010 electronic <br /> mail (copy attached)to the EHD via Geotracker by February 28,2011. <br /> Thank,you for your continued cooperation. Please contact Michael Infurna at (209) 468-3454 if <br /> you have any questions. <br /> AL c,Gs / <br /> Michael J. Infurna Jr., R HS Nuel C. Henderson Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James L. Barton, CVRWQCB <br /> Mr. Mark Owens, SWRCB <br /> Mr. Brad Shelton, Stantec, 3017 Kilgore Road #100, Rancho Cordova, CA 95670 <br /> Ms. Diane Barclay, Stantec, 3017 Kilgore Road#100, Rancho Cordova, CA 95670 <br />