Laserfiche WebLink
xr nl 's� <br /> cam-` _ <br /> r r <br /> I = - Herding Lawson Associates <br /> f I INTRODUCTION <br /> This report presents the results of Phase III of the soil and ground-water <br /> # ' investigation performed by Harding Lawson Associates (HLA) at the 7-Eleven fa- <br /> cility, 455 West Grant Line Road, Tracy, California (Plate 1). The facility <br /> c has three underground gasoline storage tanks. In October, 1986, a leak was <br /> detected in the 10,000-gallon unleaded fuel tank. This tank was immediately <br /> emptied and decommissionej. In November, 1986, 7-Eleven contracted HLA to <br /> install four monitoring wells (MW-1 through MW-4) at the site perimeter. The <br /> s <br /> A r results of this Phase I investigation were presented in our report dated <br /> .; February 10, 1987. To augment the monitoring network, a fifth monitoring well <br /> and two exploratory borings were drilled and sampled in March, 1987. The <br /> _ results of this Phase II investigation were presented in our report of April j <br /> a 20, .1387.' s <br /> The Phase III investigation was initiated to further delineate the'hori- <br /> t , zontal extent of gasoline on the site and to develop plans for remediation. <br /> Our scope of services for this investigation included the following I . 1 ung tasks: <br /> Assess the horizontal extent or' free product in the area of the <br /> underground gasoline tanks. <br /> f 2. Trace the distribution and extent of benzene, toluene, xylene and <br /> ethylbenzene (BTXE) on-site in the ground water. <br /> 3. Identifyaoproori.ate alternatives for the control and remediation of <br /> gasoline constituentsinthe <br /> - - � soil and. ground water. - <br /> t aso <br /> 4. Plan for the selection and implementation of appropriate remedial <br /> measures for the site. <br /> Li <br /> rr <br /> '' AMY`�• -- _ _ <br /> J <br /> L <br />