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I <br /> THE <br /> TWINING <br /> LA B O R A T O R I E S , I N C . <br /> ANALYTICAL CHEMISTRY • ENVIRONMENTAL SERVICES <br /> GEOTECHNICAL ENGINEERING • DRILLING SERVICES <br /> CONSTRUCTION INSPECTION & MATERIALS TESTING <br /> August 11, 1995 B20301.01A <br /> IC S. Dunbar and Associates <br /> 992 Pecho Street <br /> Morro Bay, Ca. 93442 <br /> Attn: Mr. Tim Pipes <br /> Subject: Soil Sample Analyses for Underground Storage Tank Removal <br /> Project: Frontier Transportation Facility <br /> 425 Larch Road <br /> Tracy, California <br /> Dear Mr. Pipes : <br /> This report summarizes the field observations and analytical results of soil samples collected <br /> during the removal of three gasoline and three diesel underground storage tanks (USTs) at <br /> the above-referenced project site on July 21 and 24, 1995. <br /> AUTHORIZATION <br /> Services provided by The Twining Laboratories, Inc. (Twining) were authorized in an <br /> agreement (C- 195-0077) signed by Mr. Tim Pipes of K. S. Dunbar and Associates (Dunbar) <br /> July 132 1995 . <br /> OBSERVATION AND SAMPLING PROCEDURES <br /> Upon removal of the USTs, the depth to the base of the USTs below site grade was <br /> measured and recorded. The physical dimensions of the USTs were measured and <br /> recorded. The USTs were visually inspected for oxidation, discoloration, holes, and other <br /> distinguishing physical characteristics. Soils within the excavation were observed for <br /> discoloration and the presence of petroleum product odors, <br /> Soilsamples were collected approximately 3 feet beneath the USTs. These soil samples <br /> were removed from the excavation by an excavator. Twining's technician collected the soil <br /> samples by pushing a precleaned stainless steel sleeve into soils within the excavator's <br /> bucket. In addition, characterization soil samples were collected from excavated soil <br /> stockpiles. Each soil stockpile characterization sample was a composite sample comprised <br /> of four sub-samples. In addition, a sample of groundwater was collected from the diesel <br /> UST excavation. The water sample was collected by lowering a disposable bailer into the <br /> CORPORATE OFFICE: MODESTO VISALIA BAKERSFIELD <br /> 2527 Fresno Street 4230 Kiernan Ave. Suite 105 2521 E. Valley Oaks Drive 3701 Pegasus Drive, Suite 124 <br /> Fresno, CA 93716 Modesto, CA 95256 Visalia, CA 93292-6710 Bakersfield, CA 93308 <br /> (209) 268-7021 • Fax 268-7126 (209) 545-1050 • Fax 545-1147 (209) 625-1712 • Fax 625-1714 (805) 393-5088 • Fax 393-4643 <br />