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FROM Ground Zero Analysis PHONE NO. : 209 838 9883 <br /> ..� Aug. 28 2000 11:26RM P2 <br /> MEMORANDUM <br /> DATE: 08/28/00 <br /> TO: RON ROWE, PHS/EHD <br /> FROM: GREGSTAHL <br /> SUBJECT: KNOWLES/ROEK 102 S. WILSON WAY <br /> We spoke on August 2 about approval of our workplan addendum for the site. You indicated <br /> that you and Marty Hartzell had discussed the case, and according to my notes wanted to see <br /> the following modifications: <br /> • The fate and transport modeling, remedial effectiveness evaluation and health risk <br /> evaluation portions of the Workplan to be postponed pending the results of <br /> confirmation borings. <br /> • Two additional exploratory borings, one to be located between wells MW5 and <br /> MW13 and a second to be located west of MWI and MW6. This makes a total of <br /> six soil borings. <br /> • Boring CPT1/CBI (located within the former tankpit) to be advanced to a minimum <br /> depth of 110 feet. The other borings to be advanced to minimum depths of 80 feet, <br /> or deeper if indications of contamination persist. <br /> • At each boring location, a cone penetrometer test (CPT) hole to be advanced as a <br /> preliminary lithological identification tool. Each CPT boring to be twinned with <br /> direct push equipment and soil and groundwater samples collected from intervals of <br /> interest as identified from the CPT data and previous data. Soil and groundwater <br /> sampling intervals to be agreed upon in consultation with PHS/EHD and RWQCB. <br /> • Monitoring well MW13 to be properly destroyed under PHS/EHD permit. <br /> In addition to the above, you and Mr. Hartzell indicated your approval of the installation of <br /> proposed monitoring well MW 14. <br /> Please let me know if the above correctly reflects our conversation. <br />