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k4 KLLINFCLDER <br /> In rmplor+• rnrnrr!r n,pyny <br /> July 21, 1998 <br /> File: 40-3202-01 <br /> Mr. John Hopkins, Vice President <br /> Sheldon Oil Company <br /> 2850 Cordelia Road, Suite 120 <br /> Suisun City, CA 94585 <br /> SUBJECT: Groundwater Sampling Results <br /> Kent's Oil Facility <br /> 3310 Miner Street <br /> Stockton, California,95205 <br /> Dear Mr. Hopkins: <br /> +�. Attached are the analytical results for the June 17, 1998 groundwater sampling of three existing <br /> monitoring wells (MW-1, MW-2 and MW-3) at the Kent's Oil Facility, 3310 Miner Street, <br /> Stockton, California. <br /> FIELD ACTIVITIES <br /> On July 17, 1998, Kleinfelder collected groundwater samples from three monitoring wells at the <br /> site. Mr. Doug Heard of our Stockton office was the field technician. <br /> Measurement of Groundwater Levels <br /> Upon arrival onsite, all wells were opened and allowed to equilibrate. After approximately 30 <br /> minutes, the depth to groundwater was measured in the three wells using a conductivity-based <br /> water level indicator. The water level indicator was cleaned prior to use in each well to reduce <br /> the potential for cross-contamination. Measurements were made to the surveyed mark on the <br /> north rim of the monitoring well PVC casings. Groundwater depth measurements were <br /> converted to groundwater elevations. These elevations were plotted as shown on Plate 1, <br /> i <br /> Groundwater Elevation Map. "fable 1 presents a summary of water level measurements. <br /> Collection of Groundwater Samples <br /> Following obtaining groundwater depth measurements, Kleinfelder collected samples from the <br /> three wells at the site. During the purging, field parameters such as temperature, pH, and <br /> conductivity were monitored. Copies of'the Purge Characterization and Sample Log Sheets are <br /> presented in Appendix A. Groundwater samples were collected from these wells, and the <br /> sampling protocol for each monitoring well was as follows: <br /> 4032020114MR026 1 <br /> Copp riggh�t 1998 Kleiifelder,luc. <br /> KI EINFk rgR 71il1(;t rsilnurrnc lirr.rrl, •,;iil•, I�. I.+rrlield f .�'}.1'il!` 'ih ! ' 711:'1•_ ''� .I[1' 711-5 •i1r} 4 i{ ,' i.r>. <br />