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July 30, 1998 <br /> Page 3 <br /> concentrations are generally high, a second TPH-d sample will be fatered by the laboratory <br /> prior to extraction to remove the particulates Filtration will be performed using a glass filter <br /> (0 7 micron) TCLP filter as described by D A Zemo in the "Proceedings of the 1997 <br /> Petroleum Hydrocarbons and Organic Chemicals in Groundwater Conference " <br /> If you have any questions, please do not hesitate to call us at (916) 858-2350 <br /> Sincerely, <br /> Pacific Environmental Group, Inc. <br /> Tim Arenson kREp GE4 <br /> Senior Project Engineer �,��E IV, 0 <br /> e� <br /> �+ C o cn <br /> Christine W Brown <br /> )8 <br /> Senior Geologist x1 Q e <br /> RG 4556 <br /> F Of C a <br /> Attachments Table 1 - Groundvfater Elevation an Analytica4ata <br /> Figure 1 - Groundwater Elevation Contour Map, Second Quarter 1998 <br /> Figure 2 - TPH-g/Benzene/TPH-d Concentration Map - <br /> ' Second Quarter 1998 <br /> Attachment A - Field and Laboratory Procedures <br /> Attachment B - Certified Analytical Reports, Cham-of-Custody <br /> Documentation, and Field Bata Sheets <br /> cc Ms Diane Hinson, San Joaquin County Public Health Services, Stockton <br /> Mr John Larkin, Chevron Fuel Terminal, Banta <br /> Mr Tom Bauhs, Chevron Products Company <br /> 920-002 2D/2Q98 DOC <br />