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Ptamond Manteca CA-lune 1993 Groundwater Monitoring Page 1 10 INTRODUCTION Steffen Robertson and Kirsten (U S ) Inc , (SRK) has been retained by the 650 Management Corporation (current management of Diamond Lumber, Inc ) to perform the quarterly groundwater monitoring of three monitoring wells Installed by SRK and three monitoring wells installed by Blymyer Engineers Inc (BEI), at the Diamond Lumber facility located at 151 South Main Street, Manteca, California The Scope of Work includes sampling six groundwater monitoring wells to investigate the potential for groundwater contaminant migration from an underground storage tank location from which a tank or tanks were removed in 1985 ' Three groundwater monitoring wells were installed by SRK In November, 1991, under the direct guidance of Ms Margaret Lagorio, Senior REHS, San Joaquin County Public Health Services/Environmental Health Division (PHS/EHD) Specific information regarding subsurface soil conditions and monitoring well ' construction details is presented in SRK's Phase II Environmental Audit Report for this site dated December 1991 The original three groundwater monitoring wells were installed by BEI on November 15, 1989 in an area near the presumed UST location A copy of the BEI report is included as an appendix In SRK's Phase II Environmental Audit Report (December 1991) ' It should be noted that SRK recently (June 1993) received documentation from San Joaquin County including previously unreleased information submitted to the County by Blymer Engineers dated August 16, 1990 This data is included in Appendix A to this report, and changes the Blymer nomenclature of their rborings and wells We have also included further information supplied by San Joaquin County as well as review notes prepared by SRK for 650 Management dated June 17, 1993 It is apparent in review of this information that the contamination currently identified at the property appears to be consistent with that reported by Blymer, as updated in I990 This report addresses work activities completed on June 29 and 30, 1993, and represents the fifth monitoring event at this facility The quarterly groundwater sampling activities were performed by fully qualified SRK professionals under the technical guidance and direct supervision of Rob D Gwilym, an Environmental Geoscientist and registered Environmental Professional (NAEP 1792) also registered as an Environmental Geoscientist and registered as an Environmental Assessor in California (0035), and certified by the American Institute of Professional Geologists(4529) Geologic and hydrogeologic aspects were completed under supervision and guidance of Gregory W Knell, California Registered Geologist 4692 � D GFO`o GREGORY W KNELL A CP 0 4692 0F CA 2 0 SCOPE OF SERVICES The scope of work for the Quarterly Groundwater Monitoring includes • Measuring the static water level relative to the top of casing J1� 325o412u4)uiyMw Steffen Robertson and Kirsten