Laserfiche WebLink
a <br /> GETTLER - RYAN INC. <br /> WORK PLAN FOR ADDITIONAL SUBSURFACE ASSESSMENT <br /> AND REMEDIAL ACTION <br /> at <br /> Former Unocal Station No.0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Report No.240042.11 <br /> INTRODUCTION <br /> At the request of Unocal Corporation (Unocal), Gettler-Ryan Inc. (GR) has prepared this Work Plan for <br /> additional subsurface assessment and remedial action for the above referenced site. The purpose of this <br /> investigation is to further delineate the extent of dissolved petroleum hydrocarbons in groundwater <br /> downgradient of the subject site, and to expand the existing ozone microsparging remedial system. The <br /> proposed scope of work includes: obtaining the required well installation and encroachment permits; <br /> installing one groundwater monitoring well; installing eight ozone microsparge wells and supporting <br /> equipment; collecting soil samples from the monitoring well boring; developing and sampling the <br /> monitoring well; analyzing selected soil and groundwater samples; surveying the newly installed wells; <br /> and preparing a report presenting the findings of the investigation. This work was requested by the San <br /> Joaquin County Public Health Services(SJCPHS)in a letter dated October 10, 200E <br /> The scope of work described in this Work Plan is intended to comply with the State of California Water <br /> Resources Control Board's Leaking Underground Fuel Tanks (LUFT) Manual and California <br /> Underground Storage Tank Regulations, 1994, the California Regional Water Quality Control Board <br /> (CRWQCB) Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of <br /> Underground Tank Sites, and SJCPHS guidelines. <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 (Figure 1). The site is situated in an urban area of retail shops <br /> and hotels. Topography in the site vicinity is flat lying, at an elevation of approximately 15 feet above <br /> mean sea level (MSL). Surface water in the vicinity of the site consists of McLeod Lake and the Stockton <br /> Deep Water Channel, located approximately one-half mile 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, and two gasoline and one waste <br /> oil underground storage tanks (USTs) in a common excavation. All station facilities have been removed <br /> and the site is currently an unpaved vacant lot. <br /> 6747 Sierra Court , Suite J • Dublin , California 94568 • (925) 551 - 7555 <br />