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Y <br /> rL <br /> KEI-P89--1 .04 .R13 <br /> August 11, 1994 <br /> Page 2 <br /> for EPA method 8010 constituents. The analytical results of the <br /> water sample collected from the domestic well indicated 300 ppb of <br /> TPH as gasoline, 21 ppb of xylenes, 1. 3 ppb of 1, 4-dichlorobenzene, <br /> and 4 . 8 ppb of 1, 2-dichlorobenzene, with all other analyzed <br /> constituents showing no detectable concentrations . <br /> On September 24 , 1992 , the steel casing of the second domestic well <br /> was pressure grouted to the surface with bentonite cement grout <br /> using a tremae pipe in con3unction with a grout pump. The second <br /> phase of the destruction of this well was to include drilling <br /> around the well casing with hollow-stem augers, to the full depth <br /> of the well (approximately 78 feet deep) , and f filling the annulus <br /> with neat cement grout. A permit for the well destruction was <br /> obtained from the San Joaquin County Public Health Services <br /> Department (SJCPHS) . <br /> i <br /> WELL DESTRUCTION <br /> On July 26 and 27 , 1994 , the second and final phase of the domestic <br /> well destruction was completed by fully drilling out around the <br /> existing well casing with 20 inch hollow-stem augers. The borehole <br /> was then pressure grouted from the total depth drilled to the <br /> surface with 9-sack cement/sand slurry using a tremie pipe plumbed <br /> with flexible hose to a grout pump. Mr. Harlin Knoll of the SJCPHS <br /> was present during the well destruction operations. <br /> All soil and rinsate materials generated during the well destruc- <br /> tion operations were stored on-site pending proper disposal. <br /> DISTRIBUTION <br /> A copy of this report should be sent to Mr. Harlin Knoll of the <br /> SJCPHS, and to the Regional Water Quality Control Board, Central <br /> Valley Region. <br /> LIMITATIONS <br /> Soil deposits and rock formations may vary in thickness, lithology, <br /> saturation, strength and other properties across any site. In <br /> addition, environmental changes, either naturally-occurring or <br /> artificially-induced, may cause changes in ground water levels and <br /> flow paths, thereby changing the extent and concentration of any <br /> contaminants. our studies assume that the field and laboratory <br /> data are reasonably representative of the site as a whole, and <br /> assume that subsurface conditions are reasonably conducive to <br /> interpolation and extrapolation. <br /> • The results of this study are based on the data obtained from the <br /> field and laboratory analyses obtained from a state-certified <br />