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GeoStrateg ies - yQ <br /> .0 <br /> August 6, 1997 FILEL S� SS <br /> Mr. Dave Camille RPT 9P ~ <br /> Tosco Marketing Company QM TRANSMITTAL <br /> Environmental Compliance Department -.�2�3 4 5 <br /> 2000 Crow Canyon Place, Suite 400 _� <br /> San Ramon, California 94583 <br /> Subject: Waste-oil UST and Remote Fill Line Soil Sampling at BP Station No. 11195, 16500 East <br /> Louise Avenue, Lathrop, California. <br /> Mr. Camille: <br /> At the request of Tosco Marketing Company(Tosco), GeoStrategies(GSI) conducted a soil investigation during the <br /> removal of the waste-oil underground storage tank (UST) at the subject site (Figure 1). The scope of work <br /> included: collecting soil samples beneath the former waste-oil UST and remote fill line; collecting composite soil <br /> samples from the stockpiled soil; analyzing the soil samples; evaluating disposal options for the stockpiled soil; and <br /> preparing a report of the field activities and analytical results. <br /> The site is an active retail station situated on the southwestern corner of East Louise Avenue and Harlan Road in <br /> Lathrop, Califomia. Current facilities consist of a retail mini-mart, two dispenser islands, and three gasoline UST's <br /> that share a common pit near the northern site boundary. Pertinent site features are shown on Figure 2. <br /> WASTE-OIL UST AND REMOTE FILL LINE SOIL SAMPLING <br /> Soil sampling was conducted by GSI in accordance with GSI Field Methods and Procedures(attached). Soil samples <br /> collected during this investigation were submitted under chain of custody to Sequoia Analytical in Sacramento, <br /> Cali fomis(FLAP#1624). Analytical methods and results are summarized in Table 1. Laboratory analytical reports <br /> and chain of custody documentation are attached. On May 14, 1997, Gettler-Ryan (GR) removed one 550 gallon <br /> waste-oil UST. The tank was transported by Erickson, Inc. to their facility in Richmond, Califonnia for destruction. <br /> Copies of the Uniform Hazardous Waste Manifests for the waste-oil UST, rinsate, and certificate of UST destruction <br /> are attached. On June 3, 1997, GR backfilled the former waste-oil UST excavation. The compaction report is <br /> attached. <br /> On May 14, 1997, GSI collected soil samples beneath the former waste-oil UST (W.O.-1-10) and former remote <br /> fill line (FL-1-3). The-soil encounteredbeneath the former waste-oil UST and the former remote fill line was a <br /> brown sitly sand with no discoloration or hydrocarbon odor. Mr. Robert McClellon of the San Joaquin County <br /> Environmental Health Division was present during the collection of the soil samples. Soil sample Iocations are <br /> shown on Figure 3. <br /> Soil samples W.O.-1-10 and FL-1-3 were analyzed for Total Petroleum Hydrocarbons as gasoline(TPHg), as diesel <br /> (TPHd), benzene, toluene, ethylbenzene, total xylenes (BTEX), Total Oil and Grease (TOG),Halogenated Volatile <br /> Organics (HVO), Semi-volatile Organics (SVO), and CAM 5 Metals. Petroleum hydrocarbons were not detected <br /> in soil samples W.O.-1-10 and FL-1-3. However, concentrations of chromium were detected at 5.1 (W.O.-1-10) <br /> and 6.9 ppm (FL-1-3), nickel at 4.6 (W.O.-1-10) and 8 ppm (FL-1-3), and zinc at 20 (W.O.-I-10) and 28 ppm <br /> (FL-1-3). <br /> 7754.61-1 <br /> 3164 Gold Camp Drive, Suite 240 - Rancho Cordova, CA 95670 - (916) 631-1314 Fax (916) 631-1317 <br />