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A T <br /> Ms. Kellie Reichenberg <br /> Reynolds and Brown <br /> November 2, 1987 <br /> Page 2 <br /> Applied Geosystems Investigation <br /> It is our understanding that Applied Geosystems was <br /> retained by Reynolds and Brown to remove the tanks and <br /> backfill the resultant cavity. According to the tank <br /> closure report, prepared by Applied Geosystems, a <br /> groundwater sample was collected from standing ground <br /> water in the excavation after removal of the tanks. The <br /> sample was collected by 45" 1r4_T .e -one *f Her glasm@D <br /> better to-ttbe° -stenndi-MT'4:,roun atA]r. iri -I- it*tyr, This <br /> is hot: anacceptable or approved method for sampling <br /> groundwater and would not be acceptable to either the <br /> DHS or the California Regional Water Quality Control <br /> Board (RWQCB) . <br /> This sampling methodology can provide significant error, <br /> either in potential cross contamination with soil, etc. , <br /> or by volatilization of the organic compounds to air. <br /> The results of this one grab sample produced benzene, <br /> toluene, and xylene, at concentrations of 2 . 6, 1. 6, and <br /> 38.8 ug/L respectively. To the best of my knowledge, <br /> this type of sampling would be unacceptable to the local <br /> Regional Water Quality Control Board. <br /> Aqua Terra Technologies Investigation <br /> Because the Applied Geosystems groundwater sample was <br /> not collected according to acceptable protocol, and <br /> because of inconsistencies in data, Aqua Terra <br /> Technologies resampled the KJC down gradient monitoring <br /> well on October 13, 1987 . The KJC well is designated as <br /> MW1 and is located 12 inches north of the former tank <br /> excavation area. The flow of groundwater has been <br /> reported to be north to northwest. This implies that <br /> should any leakage of the former underground tanks <br /> occurred, contamination would have been found in the <br /> down gradient well sample. <br /> Sampling equipment consisted of teflon bailer, nylon <br /> rope, and a teflon/stainless steel, flow controlling, <br /> bottom emptying device. All sampling equipment was <br /> steamed-clean prior to arriving at the site. At the <br /> well location, the sampling equipment was recleaned <br /> using a trisodium phosphate (TSP) solution and then <br /> rinsed with bottled water and distilled water. <br />