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Mr.Michael J.Infurna,Jr.—San Joaquin County Public Healih Services—Environmental Health Division <br /> November 7,2002 <br /> letter to Tosco dated July 22, 2002. In order to delineate the vertical component of the <br /> dissolved MtBE plume, GR proposes to install two cone penetrometer (CPT) tests at the <br /> locations shown on Figure 2. The proposed CPT tests will be advanced to a maximum <br /> depth of 125 feet bgs, in an attempt to identify if an aquitard exists below the second <br /> aquifer and if a third aquifer is present below the site. The CPT tests will include <br /> collection of grab groundwater samples from the third aquifer, if identified, or grab <br /> groundwater samples from a deeper portion of the second aquifer. CPT data will be <br /> utilized to determine if wells deeper than 80 feet bgs, as proposed in GR's Work Plan of <br /> July 8, 2002, are necessary. Once the CPT is complete, GR will provide a technical <br /> report to the EHD with the CPT logs and results of grab groundwater sampling, and a <br /> proposal for well construction if determined to be different than the deeper wells GR has <br /> already proposed. <br /> SCHEDULE <br /> GR would like to install the proposed CPT tests by December 20, 2002. Submittal of the <br /> CPT report is anticipated to occur prior to January 30, 2003. Installation of the interim <br /> action remediation system and additional shallow groundwater monitoring wells is <br /> proposed to be completed by December 21, 2002. This proposed schedule is dependent <br /> on EHDs issuance of drilling permits and scheduling of subcontractors, and is subject to <br /> change. <br /> If you have any questions about this letter or its attachments, please feel free to call either <br /> of us at (707) 789-3255. <br /> Sincerely, <br /> Gettler-Ryan Inc. <br /> Jed A. Douglas <br /> Senior Geologist ��RED GEO� <br /> AS J. <br /> No. 6882 <br /> 4Doug J. ee <br /> Senior Geo ogist, R.G. 6882 <br /> 9TH OF CA4\EO�t. <br /> Attachments: <br /> Figure 2 —Site Plan <br /> Materials Safety Data Sheet for Unleaded Gasoline-Tosco Products <br /> cc: Mr. Ed Ralston, Tosco Corporation, Roseville, California <br /> Mr. Marty Hartzell - Regional Water Quality Control Board, <br /> Central Valley Region, 3443 Routier Rd., Suite A, Sacramento, CA 95827-3003 <br /> 140245.08 4 <br />