Laserfiche WebLink
.212 WE <br /> MME Ii P <br /> M <br /> i RY <br /> Clayton <br /> • f\'L'IRCht1EhTAE - ' <br /> CONSULTANTS <br /> a i <br /> 1.0 <br /> Clayton Environmental Consultants, Inc. was retained by Orchard Supply Hardware <br /> (OSH) to irwaa one monitoring well and properly abandon two additional wells at the <br /> northeast cz.icr of MacArthur Drive and Grant Line Road in Tracy, California <br /> (Figure 1). Mr. Michael D. La Tourette authorized this project an November 29, <br /> 1990, by accepting Clayton's Propos.sl No. 90-B-281 and its accompanying terms and <br /> ! conditions. <br /> 2.0 Bim'• r JQ= <br /> i Clayton was contracted by OSH in January 1990 to conduct a Phase I environmental <br /> '' f assessment of the subject site. The assessment revealed that a gasoline underground <br /> storage tank (CYST)was removed in 1986. Kaprealian Engineering, Inc. (KEI) had <br /> been retained by the owner, Mr. Jim Joseph, to install a groundwater monitoring well. <br /> A water sample from the well was analyzed for total petroleum hydrocarbons (TPH) <br /> as gasoline and the volatile hydrocarbons, benzene, toluene, ethylbenzene and xylenes <br /> (BTEX). All of these constituents were below detectable limits. Clayeon could not <br /> find the well duriq the assessment We were later informed that it had been <br /> abandoned. .:. <br /> Clayton.was retained by OSH to install three monitoring wells to sample and analyze ' <br /> soil and groundwater at the subject site (Clayton Project No. 2.8094.00). The three <br /> wells were installed on March 28, 1990 and locations of these vAs are provided in <br /> FigLre <br /> 17 <br /> ti.1 <br /> The analytical results of soil samples taken from the monitoring wells (MW-1; MW-1 . <br /> and MW-3) are summarized in Table 1. <br /> Analysis,of soil samples from boreholes for wells MW-1 and MW-2 did not show <br /> detectable levels of gasoline.or BTEX, except for a very low concentration of toluene <br /> w in MW-1 at 5.feet bgs. The source of the.toluene is unclear. Toluene was not <br /> detected deeper in the boring nor mas it detected in the groundwater. <br /> Concentrations of gasoline, toluene, ethylbenzene, and xylene in soil samples from the. <br /> borehole forwea MW-3, next to the old gasoline tank, exceeded UJFT guidelines: �{ <br /> Table 2 shows only those compounds detected. All other compounds were below <br /> { detection limits or not analyzed. <br /> ., Monitoring wells:MW 1 an MW-2 showed no detectable petroleum hydrocarbons. <br /> Monitoring well MW-3 skewed traces of petroleum hydrocarbeAs well below <br /> regulatory guideiin: <br /> Based on the analysis of the soil and groundwater samples from the mamtoring.welfs <br />' Clayton ref ommended excavation and aeration of the gaseline=contaminated soil in <br /> L the vicinity of the former lgcadon:of thegasoline yank, <br /> t <br /> , <br /> a E 'jl 32549- <br /> imp <br /> o <br /> 1 <br /> 1 Y4J <br /> rxR c, t <br /> � 2 <br /> r , <br /> �+ t <br /> t <br /> F <br />