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' Diamond Manteca CA-November 1993 Groundwater Monitoring Page I <br /> 10 INTRODUCTION <br /> Steffen Robertson and Kirsten (U S ) Inc , (SRK) has been retained by the 650 Management Corporation <br /> (current management of Diamond Lumber, Inc) to perform quarterly groundwater monitoring of three <br /> groundwater monitoring wells installed by SRK and three monitoring wells installed by Blymyer Engineers <br /> Inc (BEI), at the former Diamond Lumber facility located at 151 South Main Street, Manteca, California <br /> The Scope of Work includes purging and sampling of the six groundwater monitoring wells to investigate <br /> the potential for groundwater contaminant migration from a former underground storage tank location from <br /> which a tank or tanks were removed in 1985 Samples are analyzed at a California certified laboratory, and <br /> Iresults are included in our quarterly report <br /> The three SRK groundwater monitoring wells were installed in November 1991, under the direct guidance <br /> of Ms Margaret Lagorio, Senior REHS, San Joaquin County Public Health Services/Environmental Health <br /> Division (PHS/EHD) Specific information regarding subsurface soil conditions and monitoring well <br /> construction details is presented in SRK's Phase II Environ-mental Audit Report for this site dated <br /> December 1991 The original three groundwater monitoring wells were installed by BEI on November 15, <br /> 1989 in an area near the presumed UST location A copy of the BEI report is included as an appendix in <br /> SRK's Phase 11 Environmental Audit Report (December 1991) <br /> This report addresses work activities completed November 30, 1993, and represents the sixth monitoring <br /> event at this facility The quarterly groundwater sampling activities were performed by fully qualified SRK <br /> professionals under the technical guidance and direct supervision of Rob D Gwilym, an Environmental <br /> Geoscientist and registered Environmental Professional (NAEP 1792) also registered as an Environmental <br /> Assessor in California (0035), and certified by the American Institute of Professional Geologists (4529) <br /> Geologic and hydrogeologic aspects were completed under supervision and guidance of Gregory W Knell, <br /> California Registered Geologist 4692 <br /> 40![J1fA�T�l9 w C����DG � <br /> 1�, QCT <br /> GREGORY W K L <br /> 00325 <br /> Expires�`•� QP H 4692 Q <br /> 9r""'OF CAt�F���` <br /> FOF CALIF4Q` <br /> 2 0 SCOPE OF SERVICES <br /> The scope of work for the Quarterly Groundwater Monitoring includes <br /> • Measuring the static water level relative to the top of casing <br /> • Purging and sampling the wells according to PHS/EHD guidelines <br /> • Shipping the groundwater samples under correct chain-of-custody procedures to a California <br /> licensed laboratory for analyses <br /> • Reporting the analytical results and supplying comparisons between these results and those from <br /> earlier monitoring events <br /> • Update of the estimate of localized groundwater gradient <br /> 72504 zzw-QtdyM� Steffen Robertson and Kirsten <br />