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SECOR <br /> Ms. Devra Lewis <br /> August 12, 2004 <br /> Page 2 <br /> ASSESSMENT ACTIVITIES <br /> FIELD ACTIVITIES <br /> On June 21, 2004, SECOR supervised Cascade Drilling Incorporated (Cascade) of Rancho <br /> Cordova, California, as they advanced three soil borings, SB-1, SB-2, and SB-3 at the <br /> locations shown on Figure 2. The soil borings were advanced to approximately 9-1/2 to 10 <br /> feet bgs. Each boring location was hand-cleared using an air-knife tool and a hand auger <br /> to a total depth of approximately 6 feet bgs. Groundwater and select soil samples were <br /> collected from each boring and submitted to Lancaster Laboratories Incorporated <br /> (Lancaster) of Lancaster, Pennsylvania for chemical analysis. In addition, samples were <br /> also submitted to ChevronTexaco Energy Technology Company (ETC). <br /> ANALYTICAL PROCEDURES <br /> Lancaster analyzed soil and groundwater samples for the following constituents: <br /> • Total petroleum hydrocarbons as gasoline (TPHg) by CA LUFT; <br /> • Total petroleum hydrocarbons as diesel (TPHd), total petroleum hydrocarbons as jet <br /> fuel (TPHj), and total petroleum hydrocarbons as motor oil (TPHm) by modified EPA <br /> Method 8015B, and, <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), and methyl tertiary butyl <br /> ether(MtBE) by EPA Method 8260B. <br /> The soil and groundwater samples were also analyzed by ETC for gasoline, diesel, and jet <br /> fuel range petroleum hydrocarbons. <br /> RESULTS <br /> Subsurface Conditions <br /> Field observations and boring logs indicate that the top 3 feet of soil consisted primarily of <br /> sand with fines. From approximately 3 to 7 feet bgs clayey-sand was encountered. <br /> Beyond 7 feet bgs, sandy clay was predominant. The color of clays logged within 1 to 7 ft <br /> bgs were generally very dark brown, brown, dark gray, or dark brown. During boring <br /> activities groundwater was typically encountered around 6-1/2 to 7-1/2 ft bgs. Boring logs <br /> are included in Attachment 2. <br /> is\Chevron\32792\Reports\Chevron Pipeline Assessment Report RevA.doc <br />