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3265 Fortune Court ■ Auburn,CA 95602-7847 blackburn2437 Front St. ■ West Sacramento,CA 95691 <br /> (530)887-1494 ■ Fax:(530)887-1495 • • (916)375-8706 ■ Fax:(916)375-8709 <br /> Geotechnical/Geo-Environmental/Materials Engineering and Forensics ■ Construction Management and Inspections <br /> September 15, 2004 <br /> BCI No. 393.4 <br /> Mr. Wes Johnson <br /> County of San Joaquin <br /> Dept. of Public Works <br /> PO Box 1810 <br /> Stockton, CA 95201 <br /> Subject: FORMER SERVICE STATION—SOIL SAMPLING METHODOLOGY <br /> 18894 N Lower Sacramento Road <br /> Woodbridge, California <br /> Dear Mr. Johnson: <br /> Per your request, on August 23, 2004, BCI visited the former service station at 18894 N Lower <br /> Sacramento Road, Woodbridge, California, to observe evidence of suspected hydrocarbon <br /> impacted soil. This letter includes a brief summary of our field visit to the site along with a <br /> summary of our sampling techniques from our August 23, 2004, site visit. Please refer to the <br /> earlier letter dated August 25, 2004, for additional details. <br /> BCI'S AUGUST 23, 2004 SAMPLING <br /> At the request of Mr. Chris Rockway, BCI visited the former service station site at 18894 N Lower <br /> Sacramento Road on the morning of Monday, August 23, 2004. Upon his arrival BCI's <br /> representative, Mr. Jeff Patton, met with Mr. Rockway (Mark Thomas & Company), Mr. Michael <br /> Callahan (San Joaquin County Department of Public Works), and unnamed other County <br /> representatives. We were directed t-- a pothole near the center of the concrete island presumed to <br /> be the dispenser island associated with the former service station. Based on observations and <br /> discussions at the site, we performed the following sampling procedures: <br /> Soil Sampling- While onsite we hand augured from the bottom of the hole to approximately 5 to <br /> 5.5 feet below the ground surface. The soil was mottled tan/brown, moist, medium dense, (fine) <br /> sandy Silt with either no hydrocarbon odor or very faint hydrocarbon odor. We collected one <br /> relatively undisturbed, 6-inch long, drive sample from approximately 4.5 to 5 feet below the <br /> ground surface. The sample had only a very faint hydrocarbon odor if any at all. <br /> The sample was collected by first hand auguring the hole to 4.5 feet below the surface, the sample <br /> was collected with hand driven sampler with a 6-inch long, 3-inch diameter brass tube slipped <br /> inside a stainless steel sampling shoe. Both the brass tube and the collection shoe were cleaned <br /> with a TSP solution and rinsed with water prior to sample collection. <br />