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' W � A IRE SNA WATIwRW{)Rh C,ORF' INDUSIRILS .Z, November 20, 1990 IN Mr. Steve Schneider Sen Joaquin Public Health Services s, I;i'',' 2 6 •' , Environmental Health Division V. P.O. Box 2009 Stockton, CA 9520 . Re: Soil Corltiii.nation Pro6lei Assessment, Waterloo School, 7007-North Petsi Road, Stockton, CA 95201 , Dear Steve: WaterWork, in an effort to define soil contamination at Waterloo School, drilled one soil boring to 82,5 feet below grade, and three soil borings to 31.5 feet below grade (Figure 1 ). The deep boring was drilled in the center of the former tank pit to define the vertical extend of soil contamination. The boring was terminated at 82.5 feat, which was as deep as the hollow stem auger drill rig could drill. This boring was converted into a vapor well for future treatment of the soil. The construction details are included on the boring logs (Attachment 1). Three soil borings were drilled, around the former tank pit, to define the lateral extent of contamination. The borings were drilled to 31.5 feet below grade. c Drilling was conducted by Spectrum Drilling under a C57 license. Drill cuttings were logged continuously for characterization of contamination and soil type using the Unified Soil Classification system. The soil beneath Waterloo School, consists of silts and Clays to approximately 30 feet and well graded sands and occasional clays from 30 feet to the maximum depth explored (see boring logs-Attachment 1). Soil samples were collected from ePrh boring at five foot intervals. The samples were col ler o ' ( , preserved and transported under chain-of-custody in accora r_;e with WaterWork's Soil Sampling Protocol. (Attachment 2). ;,ails encountered were monitored for organic vapors by placing a small dmount of representative material in a sealed container, then measuring the concentration of volatiles collected in the head 1 110 MAIN STRFLT • I'St•ALON,CA 95320 • (219)x3K-15%7 `WAI.Sli AVE:N[.li - SANTA CI.ARA,CA 95051 - 140h)496-1249 r L space of the container with a photoionization detector (FID) calibrated to the isobutylene molecule. The values obtained at each measurement point were recorded on the boxing logs (Attachment I)- Soil samples submitted for analysis were selected based on obvious signs of contamination (i-e- PID readings and soil discoloration? and stratigraphy- „ The samples were collected, preserved and transported under chain-of-custody in accordance with WaterWork's Soil Sampling Protocol (Attachment 2). Samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHG), by EPA methods 8020/8015 and organic lead by Luft manual methodologies. J i Groundwater was not reached, but WaterNork anticipated that I t groundwater would be found between 90 and 100 feet below grade. 1 Sample analysis results revealed BTEX contamination to 80.5 feet below grade and TPHG to 70.5' below grade in the deep boring (VW1). Organic lead was not detected. The vertical extent of soil Contamination and the high concentrations of shallow contamination warrant remediation- At ` this time no remediation alternatives have been evaluated due to the financial constraints of;-'the- Linden School. District. The school district is plannin o.. � E wing f rr S�I►na ;,ll$x.} �, 2004 before continuing wotic o�tilfo�hot: " If you have any questioniel'�'eb66tP.tlthis' project, please contact either Lois Frantz or Bill'Chanselltat,our office. rrd*r Respectfully, Watelrwork Bill Channell Senior G olo ist Cott Russell W. Juncal CA Registered Geologist No. 3864 1 F LF/tdp pc: RWQCa F. Hubbard