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cNVfItOAMLN!Ai HEA1,711 <br /> ROBERT A. BOOHER CONSULTING F471'F"T "FP VICr <br /> Environmental Planning&Management <br /> 3247 Glen AbbeN Dn%e 03 JUL 17 PM 12% 20 <br /> Fairfield,California 94585 <br /> Telephone(707)399-7835 <br /> E-mail bboohernpacbell net <br /> July 2, 2003 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division (PHS-EHD) <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202-2708 <br /> RE Work Plan Addendum <br /> California Cedar Products, Inc <br /> 1340 West Washington Street <br /> Stockton, CA 95202 <br /> Mr Knoll, <br /> Robert A Booher (RAB) Consulting is pleased to present this Work Plan Addendum <br /> to recommendations set forth in our investigation report dated October 21, 2002 and <br /> in response to your letter dated November 21, 2003 This Work Plan Addendum is <br /> based upon discussions during our site meeting on May 8, 2003 The following <br /> changes to the Work Plan will be made <br /> 1) As proposed in the original work plan, five additional soil <br /> borings/hydropunches (HPI through HP5) will be installed and water samples <br /> will be collected by bailing groundwater through temporary installed casings <br /> Borings will terminate in the clay layer at approximately 25 feet below grade <br /> surface (bgs) with the exception of proposed boring HPI which will be <br /> advanced with a 4 inch auger to approximately to approximately 25 feet bgs <br /> (sampling every five feet), then continuously logging the boring to 40 feet bgs <br /> unless a change of lithology indicates that the clay layer thickness has been <br /> determined before 40 feet Continuous logging will be performed by driving an <br /> 2" by 18" split spoon sampler every 18", then cleaning out the hole to bottom <br /> of last sample elevation with 4" augers before driving the sampler for the next <br /> 18" <br /> 2) Proposed hydropunch/bormg locations designated HP2 and HP5 will be placed <br /> in the revised locations as shown on the attached revised Figure 6 <br /> . 3) At this time, a groundwater monitoring well will not be installed Data <br /> collected from these proposed activities will be evaluated to determine if future <br /> groundwater monitoring will be necessary <br />