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STEFFEN ROBERTSON AND KJRSTEN <br /> January 27, 1993 <br /> ' Mr Mike Brinton <br /> City of Manteca <br /> ' Public Works Department <br /> 1001 West Center Street <br /> Manteca, California 95336 <br /> Re: Disposal of Six 55-gallon Drums of Water from Groundwater Monitoring at the <br /> Diamond Lumber facility, 151 Main Street, Manteca, California <br /> Dear Mr Brinton <br /> Pursuant to my phone conversation with your department on January 26, 1993, regarding disposal of <br /> the above referenced material into the City of Manteca sewer system, Steffen Robertson and Kirsten <br /> ' <br /> (US) Inc , (SRK) is providing your department with the following information SRK has been <br /> retained by the 650 Management Corporation (current management of Diamond Lumber, Inc) to <br /> perform the quarterly groundwater monitoring of six monitoring wells at the above referenced facility <br /> Three of the six groundwater monitoring wells were installed by SRK in November, 1991, under the <br /> direct guidance of Ms Margaret Lagorio, Senior REHS, San Joaquin County Public Health <br /> Services/Environmental Health Division (PHS/EHD), while the three pre-existing monitoring wells <br /> were installed by Blymyer Engineering Inc (BEI) in 1989 <br /> A total of six 55-gallon drums of water have been generated during groundwater monitoring activities <br /> from monitoring wells SRK-MW1 and SRK-MW3 The following table includes all available data <br /> collected during quarterly monitoring events The analytical parameters include volatile hydrocarbons <br /> (by EPA 8015M, GC/FID Purge & Trap), benzene, toluene, ethylbenzene, and xylene (BTEX) <br /> (Aromatics by EPA 602/8020, GC/PID Purge & Trap), and total lead (EPA Method 239 2 GFAA) <br /> The constituents of BTEX and volatile hydrocarbons have not been detected during the quarterly <br /> monitoring events at either well, however, trace amounts of lead(less than 60 ppb)have been detected <br /> These drums contain well purge waters from all the monitoring events listed below <br /> Analytical Groundwater Data <br /> Novembeir 25, 1941; ApW 1992 N s' n n Au " i 199.2 <br /> EIbenzcnc <br /> SRKMWl SRK-MVS SKK-Iti€Wx SRF-MW3 SR1 - 1 SR&MNIt3 <br /> carbom ND ND ND ND ND ND <br /> ND ND ND ND ND ND <br /> ND ND ND ND NDND <br /> ND ND ND ND ND ND ND ND ND ND ND ND i9 b 24 b 26 b 57 b 48 b 14 b <br /> NOTES. <br /> ND = Analytes reported as ND were not present above detection limits (limits on next page) <br /> Steffen Robertson and Kirsten (U S ) Inc <br /> 15311 N E 90th Street, Redmond Washington, 98052, U S A <br /> Tel (206)881-2233 Facsimile (206) 881-1581 <br /> Other offices in U S A , Canada United Kingdom and Africa <br />