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1 <br /> L <br /> ETTLER - Y�4N INC. <br /> MONITORING WELL INSTALLATION REPORT <br /> at <br /> Former Unocal Service Station #0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Report No 240042 05-1 <br /> INTRODUCTION <br /> This report presents the results of a subsurface investigation performed by Gettler-Ryan Inc (GR) at the <br /> above referenced site The wort: was performed at the request of Unocal Corporation (Unocal) to further <br /> evaluate the extent of petroleum hydrocarbons in soil and groundwater downgradient of the subject site <br /> The scope of work performed included obtaining the required well installation permits from the San <br /> Joaquin County Public Health Services-Environmental Health Division (SJCPHS-EHD) and <br /> encroachment permit from the City of Stockton Department of Public Works (CSDPW), updating the site <br /> safety plan, installing four groundwater monitoring wells, collecting soil samples, developing and <br /> collecting groundwater samples from the wells, analyzing selected soil and groundwater samples, <br /> surveying the well head elevations, and preparing a report documenting the work performed This work <br /> was requested by the SJCPHS-EHD in a letter dated September 13, 1999 Work performed was <br /> originally proposed in GR's kYork Plan For Additional Subsurface Assessment (report 9240042 05, dated <br /> November 12, 1999), and approved by the SJCPHS-EHD in a letter dated December 9, 1999 <br /> SITE DESCRIPTION <br /> The subject site is a vacant lot situated on the northwest corner of East Miner Avenue and California <br /> Street in the city of Stockton, California, as shown on the Vicinity Map (Figure 1) The site is situated in <br /> an urban area of'retail shops and hotels Topography in the site vicinity is flat lying, at an elevation of <br /> approximately f5 feet above mean sea level (MSL) Surface water in the vicinity of the site consist of <br /> McLeod Lake and the Stockton Deep Water Channel, situated approximately one-half mole to the west <br /> The site was an operating Unocal service station from 1922 until 1992 Most recently the station <br /> consisted of a three-bay station building, three product dispenser islands (D-1 through D-3), and two <br /> gasoline and one waste oil underground storage tanks (USTs) in a common excavation All station <br /> facilities have been removed and the site is currently an unpaved vacant lot Pertinent features of the <br /> former service station are shown on the Site Plan (Figure 2) <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 { 925 ) 551 -7555 <br />