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SE www.secor.com - <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C O R INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> February 15, 2007 ,�c ti l �� EIDD <br /> Mr. Nathan Russell Mi? 9, 007 <br /> ConocoPhillips <br /> 1230 W. Washington St., Suite 212 ENViRONMENT HEALTH <br /> Tempe, AZ 85281 PERNI SERVICES <br /> Re: Due Diligence Site Assessment Report <br /> ConocoPhillips Station 2705445 <br /> 1206 East March Lane <br /> Stockton, California <br /> Mr. Russell: <br /> SECOR International Incorporated (SECOR)is pleased to present the results of the Due Diligence <br /> Site Assessment conducted at the above-referenced site. The purpose of the site assessment is to <br /> generate a baseline assessment of property conditions at the time of a property transfer. The data <br /> reported herein were collected on behalf of ConocoPhillips,and were not requested or required by a <br /> regulatory agency. <br /> The completed scope of work is outlined below: <br /> • Prepared a site specific Health and Safety Plan; <br /> • Marked the soil boring locations, notified Underground Service Alert(USA)and conducted a <br /> geophysical survey with a private utility locator to identify any potential conflicts with existing <br /> underground utilities; <br /> • Drilled five exploratory soil borings; <br /> • Collected soil samples at approximate 5-foot intervals for purposes of logging subsurface <br /> conditions, field screening of organic vapors using a photo-ionization detector (PID), and <br /> potential laboratory analysis; <br /> • Drilled two soil borings to groundwater and collected groundwater samples for laboratory <br /> analysis; and <br /> • Prepared a report of the site assessment activities. <br /> Baseline Site Investigation <br /> Field Activities <br /> On January 17 to 19, 2007, SECOR observed the drilling of five soil borings (B-7 through B-11) in <br /> the vicinity of the existing Underground Storage Tanks (UST's) and gasoline dispensers, using <br /> hollow-stem auger drilling equipment equipped with 8-inch diameter augers. Boring locations are <br /> shown on Figure 1. Borings were advanced to depths of 50 to 55 feet below ground surface(bgs). <br /> Soil samples were collected from borings for stratigraphic evaluation, field screening using a PID, <br /> and for possible laboratory analysis. Groundwater was encountered in two borings at depths of 45 <br />