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PROBLEM ASSESSMENT REPORT <br /> 14800 West Frontage Road Manteca California <br /> 1 0 INTRODUCTION <br /> This report documents the results of a limited subsurface investigation conducted by <br /> Aegis Environmental, Inc (Aegis), at the Moore Petroleum, Inc (Moore Petroleum), site <br /> located at 14800 West Frontage Road in Manteca, California (Figure 1) The site is <br /> currently occupied by Frank's Exxon #4, an operating gasoline retail station This report <br /> I summarizes the results of subsurface investigations undertaken at the site since 1988 <br /> Aegis was retained in January 1991 to complete the investigative activities This report <br /> is based, in part, on information obtained by Aegis from Moore Petroleum, Nations <br />' Groundwater Associates (Nations) of Sacramento, California, Earth Treatment Systems <br /> (ETS) of Merced, California, Triad Groundwater Associates (Triad) of Rancho Cordova, <br /> California, and Delta Environmental Consultants, Inc (Delta), of Rancho Cordova, <br /> ICalifornia This report is subject to modification as newly acquired information may <br /> warrant <br />' 1.1 Purpose <br /> The purpose of Aegis' investigation was to further <br /> • characterize the subsurface soil and hydrogeologic conditions, <br /> • assess the presence of petroleum hydrocarbons in shallow sods and <br /> groundwater beneath the site, and, <br /> • evaluate the need for further assessment and/or mitigation of petroleum <br /> constituents in soil and groundwater beneath the site <br /> 1.2 Scope <br /> The scope of the subsurface investigation completed by Aegis is summarized below <br /> Methods used in the investigation are in accordance with Aegis' standard operating <br /> procedures included in Appendix A <br /> • On November 15, 1991, monitoring well MW-9 was drilled and installed on <br /> the site The well was completed with 4-inch-diameter PVC casing to a <br /> depth of 43 feet below surface at the location shown on Figure 2 <br /> • During drilling, soil samples were collected at 5-foot intervals and classified <br /> according to the Unified Soil Classification System <br /> • Soil samples were screened for the presence of volatile organic compounds <br /> with an "hNu" photoionization detector (PID) Soil descriptions and the PID <br /> . readings were recorded on a soil boring log (Appendix B) <br /> 90-097A PAR 7 <br /> I <br />