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f <br /> Page 3 of 3 <br /> Hello Vicki, <br /> Attached are the data tables, field figure, lab reports for the CPT work, and the draft <br /> MIP report for at Jimco Truck Plaza in Ripon, CA. Please see the lab reports for the <br /> comments related to the detections of TPHd. We are scheduled to drill the <br /> additional direct push borings in the vicinity of the former USTs and well MW-6 to <br /> horizontally delineate petroleum hydrocarbons onsite. The grab groundwater <br /> samples collected with the CPT rig have vertically delineated the petroleum <br /> hydrocarbons at the site. <br /> Low concentrations of TPHd were detected in grab groundwater samples CPT-2A <br /> (44-46 ft bgs)and CPT-2C (90-93 ft bgs); however the lab report that these <br /> detections were related to one to a few isolated peaks. Therefore, we ran an <br /> additional analysis with silica gel cleanup for these samples and the results were <br /> non-detect. These isolated peaks are likely due to the degradation of natural <br /> organic material in the subsurface. Today we received the grab groundwater results <br /> for CPT-3A(49-52 ft bgs), CPT-36 (72-75 ft bgs), and CPT-1 D (69-72 ft bgs)and . <br /> low TPHd results were detected in all three. We have asked the lab to run silica gel <br /> cleanup for all three samples. We believe that the grab groundwater samples for <br /> CPT-313 and CPT-1 D will be non-detect when we get these results since these <br /> samples have the same lab comment. Since no elevated concentrations of TPHd <br /> were detected beneath the shallow aquifer we are going to continue with the <br /> approved scope of work for advancing borings to approximately 30 ft bgs. , <br /> I will call you tomorrow to discuss the investigation results and any of your <br /> comments. Thanks! <br /> Brandon S. Wilken, P.G. <br /> Senior Project Geologist <br /> Cambria Environmental Technology, Inc. <br /> 5900 Hollis Street, Suite A <br /> Emeryville, CA 94608 <br /> P. 510.420.3355 <br /> F. 510.420.9170 <br /> C. 925.260.1833. <br /> A Woman-Owned Business <br /> This e-mail may contain confidential and privileged material for the sole use of the intended recipient.Any <br /> review or distribution by others is strictly prohibited.If you are not the intended recipient please contact the <br /> sender and delete all copies. <br /> 3/13/2007 <br />