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A WW FA 9-ft <br /> March 1, 1993 Working To Restore Nature <br /> 711 Pershing Avenue, Stockton, California <br /> Investigation-of-Soil <br /> On January 27, 1993, a tec�-ician from RESNA hand-augered four soil borings (B-1 through <br /> B-4) to approximately 10'feet below grade. Boring locations are shown o Plate 2. The <br /> technician collected soil samples from the borings at approximately 5 a210 feet below <br /> grade. The technician did not observe soil discoloration, hydrocarbon odor, or other <br /> subjective evidence of chemical residue. Aftercompleting hand-augering and sampling, the <br /> technician backfilled the borings with a neatJcement, observed by personnel of SJCPHS- <br /> EHD. (PA)/ <br /> Laboratory Analyses <br /> Soil samples collected from 5 feet below grade in each boring were submitted to a State- <br /> certified laboratory for analysis of total petroleum hydrocarbons as gasoline (TPHg) and as <br /> diesel (TPHd) using Environmental Protection Agency (EPA) Methods 5030 and 8015, <br /> benzene, toluene, ethylbenzene, and total xylene isomers usiW,:�Ia_nd <br /> A Methods 5030 and <br /> 8020, total oil and grease (TOG) using EPA Method pesticides and <br /> polychlorinated biphenyl compounds (PCBs) using EPA Method 8080. Samples were <br /> analyzed at RESNAAnalytical Laboratory in Fremont,California(Hazardous Waste Testing <br /> Certificate No. 1211) and Sequoia Analytical Laboratory in Redwood City, California <br /> (Hazardous Waste Testing Certificate No. 1210). <br /> Results of Investigation and Recommendations <br /> Laboratory analysis detected oil and grease (as TOG) and diesel-range hydrocarbons (as <br /> TPHd) at concentrations of 190 and 210 parts perIlion, respectively, in one sample, that <br /> submitted from boring B-4. Gasoline (as TPHg) aredBTEX were not detected in any of the <br /> samples submitted for laboratory analysis. The pesticides Chlordane and 4,4'-DDT were <br /> detected in samples submitted from three of the four borings (B-1, B-2, and B-4), <br /> concentrations of other pesticide and PCB analytes were below laboratory detection limits. <br /> Results of laboratory analysis are shown on Table 1, and copies of laboratory reports are <br /> attached. Soil generated from the borings was stockpiled on-site, encased in plastic sheering. <br /> Disposal of those soil cuttings remains the responsibility of Swett and Crawford Group. <br /> 0128jcom <br /> 32M-1 2 <br />