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S lEC0R <br /> Former BP Station # 11193 <br /> September 22, 2004 <br /> Page 8 <br /> groundwater samples is undetermined ConocoPhillips began dispensing diesel fuel at the <br /> Site during May,-2004, but there is no record of storage or sale of di se el fuel at the prior to <br /> tf'iis_date ru ing second and third quarter, 1993, samples collected from MW-4 were <br /> analyzed for both total petroleum hydrocarbons as diesel (TPHd) and total petroleum <br /> hydrocarbons, but both samples were below detection for these analytes To attempt to <br /> identify the discrete peaks in the diesel range, STL laboratories recommended analyzing <br /> the samples for semi-volatile organic compounds via Method 8270C Samples CPT-1 @ <br /> 56, CPT-2 @ 59, and CPT-2 @ 89 were combined to form a composite sample, which was <br /> analyzed via Method 8270C on September 15, 2004 All 8270C analytes were below <br /> detection Attachment 3 contains the laboratory report <br /> CONCLUSION AND RECOMENDATIONS <br /> The nature and source of the unidentified peaks in the diesel range are undetermined <br /> ConocoPhillips began dispensing diesel fuel at the site during May, 2004, but there is no <br /> record of storage or sale of diesel fuel at the site prior to t�his�date The attempt to identify <br /> the discrete peaks in the diesel range by Method 8270C was unsuccessful, all 8270C <br /> analytes were below detection To determine whether groundwater beneath the site is <br /> contaminated with diesel fuel, SECOR recommends that groundwater samples collected <br /> during fourth quarter, 2004 be analyzed for TPH-d via Method 8015M with silica gel <br /> cleanup (Method 3630) The results will be reported in the fourth quarter groundwater <br /> monitoring report <br /> If th!E2,W any questions, please call us at (916) 861-0400 <br /> Sincerely, <br /> SECOR Inter ationall, Incorporated <br /> CZO <br /> Q.�.� 7, #k GJIYAN WN11 '{ <br /> Brice Hendricks M Gavan Heinrich R G RNo 75�72 <br /> Project Scientist Associate Geologist <br /> Attachments Figure 1 — Site Plan <br /> Table 1 —Soil Boring Details —Groundwater Sample Depths <br /> Table 2 —Groundwater Analytical Data <br /> Attachment 1 — S,ICEHD Letter <br /> Attachment 2-- Boring Logs <br /> Attachment 3 — Certified Laboratory Analytical Report and Chain-of-Custody <br /> Documentation <br /> Attachment 4 -- Field and Laboratory Procedures <br /> CPT Report 9-04 doc <br />