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r Z <br /> . Sro;• of California �� ; - Department of Health Services <br /> Memorandum <br /> � H <br /> To Jim Tjosvold, P.E. Date q April 29, 1988 <br /> Senior Waste Management Engineer ��J �., ! ibv-. <br /> MCCORMICK AND <br /> BAXTER SOIL <br /> ASSESSMENT <br /> REPORT <br /> From Jeff Van Slooten <br /> McCormick and Baxter submitted a report titled "Soils <br /> Assessment" , dated February 1988 . The report discusses data from <br /> completion of Task 7 , 8, and 9 of the Jul. 1987 workplan. Task <br /> 6, Background Sampling, was not completed because access was <br /> denied by adjacent property owners. The report re-evaluates <br /> background metal levels with onsite samples. <br /> The Department has reviewed the results for Tasks 7, 8, and 9 and <br /> has concluded that no additional testing is necessary except for <br /> soluble metal testing in New Mormon Slough. Task 6, Background <br /> Sampling, does not need to be performed prior to the Soils <br /> Feasibility Study and the PHERA if McCormick and Baxter agrees to <br /> the Department's interpretation of the soil background levels. <br /> The Department noted several data anomalies in completion of <br /> Tasks 7 , 8 , and 9, but these do not warrant further investigation <br /> at this time. Discussion by the areas of activity are as <br /> follows. <br /> Task 7 - Onsite Soil Sampling <br /> Empty Drum Area - Analytical results from this area indicated no <br /> organic contamination and only minor elevated metal levels. <br /> Pole Peeler Area - The analyses performed in this area completes <br /> characterization for the south central stock storage region. <br /> Lippincott Lead Company Area - The shallow (less than 36 inches) <br /> soil concentration for lead in this area ranges from 13 to 580 <br /> mg/kg. Using the analytical data for lead in a non-affected <br /> area, such as L-9, 10, 11, and 12 , an approximate background level <br /> of 12 mg/kg was determined. This value suggests that the entire <br /> area for Lippincott Lead Company has elevated lead levels on the <br /> surface and at depth. In addition both samples collected at the <br /> north end show the highest levels of contamination of 110 and 580 <br /> mg/kg. Levels further north are unknown. However, these levels <br /> of lead do not represent significant contamination with respect <br /> to the entire site. <br /> Hexavalent Chromium Testing - Samples were deliberately collected <br /> in locations where previous results indicated the highest <br />