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LEEDSHILL-HERKENIIOFF, INC <br /> 303 Second Street,Suite 880 North <br /> San Francisco,California 94107 <br /> 4151243 9980 <br /> September 28, 1990 O <br /> Jeanne M Zolezzi E OCT 2 6 199'2 <br /> Neumiller & Beardsiee N�IR"WNTAL HEALTH <br /> P O Drawer 20 PERM'T/SERVICES <br /> Stockton, CA 95201-3020 <br /> Re: 102 South Wilson Way, Stockton <br /> Enclosed is a copy of a supplemental Investigation conducted by Leedshill-Herkenhoff, <br /> Inc (LH) at 102 South Wilson Way, Stockton The purpose of this investigation was to <br /> gather additional soils and groundwater data to supplement LH's Preliminary Investigation <br /> Report of January 1990 <br /> During August 1990, three sal borings were installed in the northwest corner of the <br /> property to help define the extent of soil contamination identified in LH's Preliminary <br /> Investigation Report Furthermore, the sod borings were installed to identify possible <br /> source areas for groundwater contamination. Laboratory analysis of soil samples <br /> indicated elevated levels of BTX&E (benzene,toluene, xylene, and ethylbenzene) and TPH <br /> (total petroleum hydrocarbons) as gasoline In soil boring SB22 at a depth of fifteen feet <br /> However, below 15 feet, to a depth of 60 feet, very low detectable levels of BTX&E and <br /> TPH as gasoline were also present It should be noted that these extremely low soil <br /> contaminant levels are not Indicative of a groundwater contamination source area <br /> SB21 and SB23 installed northwest and southwest of S1322, respectively, indicated <br /> essentially no detectable hydrocarbon contamination These sods data indicate that this <br /> area currently does not appear to be a groundwater contamination source area <br /> One of the soil borings, S1321, was converted into a monitoring well (MW6), to replace <br /> well MW1, which has gone dry Laboratory analysis of a water sample collected from <br /> MW6 Indicated low but detectable levels of BTX&E and TPH as gasoline similar to <br /> previous samples collected from MWi. <br /> If you have any questions regarding this supplemental work, please contact Mike <br /> Tognolini or me. <br /> Very truly yours, <br /> C—C'�'Zj /i ) jwc-� <br /> Gerry S Nakano, P E <br /> Project Manager <br /> CC' Don Roek <br /> .9832-12 It/292{m) <br /> SAN FRANCISCO o SAN DIEGO o DENVER o ALt3UQUEROUE o SANTA FE a PHOENIX <br />