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.i. A ,($.cam'• � .Ty x'._ �. _ C <br /> ` KAPREALIAN EN-AINEERING, INC. <br /> K E I H Consulting Engineers <br /> P. 0. BOX 913 <br /> BENICIA,CA 94510 <br /> J415)676•9100 (707)746•6915 <br /> KEI-P88-0810 <br /> March 20, 1989 <br /> Mobil Oil Corporation <br /> P.O. Box 127 <br /> Richmond, CA 94804 E"viR�tiW`�TAZ AFF.,IRS <br /> oreRwr oNS OLPaFirMCfJr <br /> Attention: Mr. Steve Pao MAY g ]989 <br /> RE: Soil Survey <br /> Former Mobil Bulk Plant <br /> 500 E. Grantline Road <br /> Tracy. California <br /> Dear Mr. Pao: <br /> This letter presents the results of the soil survey for the <br /> referenced site, as requested by Mobil Oil Corporation. The <br /> purpose of the survey was to further define the extent of <br /> subsurface soil contamination at the site. . <br /> FIELD ACTIVITIES <br /> On February 16, 1989, 24 soil samples from 12 locations (desig- <br /> 'nated on the attached Site Plan - Figure 1 as ES-1 through ES-12) <br /> were collected at the site. The samples were collected by <br /> backhoe. Soil samples were collected at -five and ten feet at <br /> each. location, Undisturbed soil samples were collected by <br /> backhoe. The ciean,. 2" diameter brass tubes holding the samples <br /> were .sealed with aluminum foil, plastic caps and tape, and stored <br /> in a cooled ice chest for delivery to a state certified .laborato <br /> - <br /> ry. After the samples were collected, the excavated areas were <br /> backfilled . to the surface with the material removed from the <br /> hole. <br /> ANALYTICAL RESULTS <br /> am <br /> Sles .were....analyzed at <br /> _ P y Sequoia- Analytical habnratory In Redwood _._ <br /> City, California, and were accompanied by properly executed Chain <br /> of Custody documentation. Soil samples from the holes were <br /> analyzed for total petroleum hydrocarbon as gasoline using EPA <br /> method 5030 or 3810 in conjunction with modified 8015 and <br /> benzene, toluene, xylenes and ` ethylbenzene (BTX&E) using EPA <br /> nethods. 5.030 and 8020. In addition, the soil .samples were <br /> analyzed for TPH as diesel by EPA method 3550 in conjunction with <br /> modified 8015.. Copies of the _laboratory analyses and chain of <br /> Custody, documentation are attached to this report. <br />