Laserfiche WebLink
GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320 � } <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> ;a <br /> September 11, 2000 <br /> cn <br /> Mr. Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Ave., 3`d Floor <br /> Stockton, CA 95202 <br /> Subject: Modifications to Workplan for Confirmation Borings and Remedial <br /> Effectiveness Evaluation—Knowles/Roek Property, 102 South Wilson Way, <br /> Stockton, CA <br /> Dear Mr. Rowe: <br /> I am writing to memorialize my recent phone conversations with you and with Mr. Marty <br /> Hartzell with RWQCB concerning our June 27 Workplan Addendum. It was agreed that <br /> approval of the fate and transport modeling, remedial effectiveness evaluation and health <br /> risk evaluation portions of the Workplan would be postponed pending the results of <br /> confirmation borings. <br /> You and Mr. Hartzell informed me that you would also like to see the following <br /> modifications to the workscope: <br /> • Two additional exploratory borings, one to be located between wells MW5 and <br /> MW 13 and a second to be located west of MW 1 and MW6. This makes a <br /> total of six soil borings. <br /> • Boring CPTI/CB1 (located within the former tankpit) to be advanced to a <br /> minimum depth of 110 feet. The other borings to be advanced to minimum <br /> depths of 80 feet, or deeper if indications of contamination persist. <br /> • At each boring location, a cone penetrometer test (CPT) hole to be advanced <br /> as a preliminary lithological identification tool. Each CPT boring to be <br /> twinned for sampling and soil and groundwater samples collected from <br /> intervals of interest as identified from the CPT data and previous data. Soil <br /> roek\clo um\modadden.IV <br />