Laserfiche WebLink
• Ms Lori Duncan Project 20805-140 010 <br /> May 13, 1999 <br /> Page 6 <br /> HydroPunch samples collected from the air sparge well borings contained TPHG ranging <br /> from 2,590 µg/1 to 40,200 µg/1 and benzene ranging from 89 4 µg11 to 333 µg/1 MTBE <br /> was detected at 129 µg/1 in the sample from AS-1 and was below elevated reporting <br /> limits for samples from AS-2 and AS-3 These high concentrations may be the result of <br /> cross-contamination during sampling Pinnacle and ARCO recommend collecting <br /> contirmation samples to evaluate the initial results and re-evaluate the vertical extent of <br /> groundwater impacts <br /> Sincerely, <br /> Pinnacle <br /> Mark C pps Joel Coffman <br /> Project Geologist Senior Project Supervisor <br /> R G 6561 <br /> Attachments Table 1 Soil Sample Analytical Results <br /> Table 2 HydroPunch Groundwater Sample Analytical Results <br /> Figure 1 Site Location Map <br /> Figure 2 Site Plan <br /> Figure 3 Geologic Cross Section A-A' <br /> Figure 4 Geologic Cross Section B-B' <br /> Appendix A Exploratory Boring and Well Installation Procedures <br /> Appendix B Boring Logs and Well Details <br /> Appendix C Sampling and Analysis Procedures <br /> Appendix D Well Development and Sampling Field Sheets <br /> Appendix E Certified Analytical Reports <br /> cc Paul Supple, ARCO Products Company <br /> Elizabeth Thayer, Regional Water Quality Control Board, Central Valley Region <br /> Will Smith, Lincoln Properties <br /> CP\E lARC010548\REP0RTS10548P201 DOC-9811sg 1 �[strt�iC�C <br /> A-6 <br />