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-WE�E- <br />WESTERN GEO-ENGINEERS <br />CALIF. CONTRACTOR #513857 A CORPORATION <br />REGISTERED GEOLOGISTS <br />October 9, 1989 <br />Mr. John Margowski <br />Wickland Properties <br />1765 Challenge Way <br />Sacramento, California 95815 <br />RE: Regal 604 tank and product line excavation sample report. <br />Dear Mr. Margowski <br />1386 E. REAMER STREET <br />WOODLAND,CA 95695-9603 <br />FAX (916)662-0273 <br />(916)662-4541 <br />The following is the letter report concerning Western Geo - <br />Engineers (WEGE) monitoring and sampling of the tank and product <br />line excavation at Regal Station 604. <br />A WEGE geologist, under the direct supervision of Carol Oz sampled <br />the tank excavation on 9/29/89 and the product line excavations on <br />10/5/89. The excavation and tank removal was performed by Town <br />and Country Contractors on 9/26/89, see enclosed report. <br />During tank removal the WEGE geologist screened the tanks prior to <br />their removal with a GASTECH LEL/02 meter under the supervision of <br />" Mr. Rod Hiltscher of the Stockton City Fire Dept. All tanks were <br />visually inspected for any signs of failure (corrosion and <br />punctures, etc.) none were detected. Prior to the tanks leaving <br />the site the Tank ID# was sprayed on each tank with red spray <br />paint. <br />During the excavating and tank removal the WEGE geologist also <br />performed periodic ambient air checks around the site using a HNU <br />PID Model # PI 101. The ambient air along the parameters of the <br />site never exceeded 2 ppm vapor. Next to the excavation ambient <br />air ranged from 2-5 ppm along the northern edge, 5-100 ppm along <br />the eastern edge, 2-10 ppm along the western edge and 5-150 ppm <br />along the southern edge. The HNU was also used to screen the soil <br />as it was being excavated. Soil exibiting minor to moderate <br />concentrations of vapor were placed in the piles along the <br />northern boundary of the site (SP3 & SP4). The soil exibiting <br />moderate to high concentratins of vapor was place in a pile along <br />the northeastern corner of the site (SP2) and the soil exibiting <br />the highest concentrations of vapor was placed in a pile along the <br />eastern edge of the site (SP1). <br />On 9/29/89 under the direct supervision of Carol Oz a WEGE <br />geologist obtained 10 soil samples from the tank excavation, see <br />Table 1 of this report. All samples were gathered at <br />approximately 0.5 to 1 foot below the existing surface of the <br />1 <br />