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HORIZCYN ENVIRONMEN'rAL INC. <br /> r ` Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> March 18, 2009 <br /> Ms. Margaret Lagorio nD �-� ��J] n r <br /> San Joaquin County nEC �"l E`er (6"�6r► <br /> Environmental Health Department 209 <br /> 600 East Main Street MAR 2 0 <br /> Stockton, California 95202-3029 ENVJR0NMENT 'HEALTH <br /> PERMIT/SERVICESSubject: Soil Gas Investigation Work Plan <br /> Quik Stop Station No. 76 `� r <br /> 1030 South Olive Avenue, Stockton, California <br /> Ms. Lagorio: <br /> At the request of Quik Stop Markets (Quik Stop), Horizon Environmental Inc. (Horizon) has <br /> prepared this letter work plan for a soil gas investigation at the Quik Stop Station No. 76 <br /> (site) located in San Joaquin County, California. The work plan was requested by the San <br /> Joaquin County Environmental Health Department (EHD) in the attached correspondence <br /> dated 18 February 2009. <br /> The purpose of the soil gas investigation is to gather data for evaluation of the potential of <br /> soil gas intrusion into the on-site building and evaluation of the enclosed space inhalation <br /> exposure pathway. This work plan was developed in general accordance with the Regional <br /> Water Quality Control Board (RWQCB) document Tri-Regional Board Staff <br /> Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites. <br /> Site Description and Background <br /> The Quik Stop No. 76 site is a convenience market and retail gasoline station located on the <br /> northeastern corner of the int?rsection of East Main Street and South Olive Avenue in a <br /> commercial and residential area of Stockton, California as shown on Figure 1. The level site <br /> is at an elevation of approximately 31 feet above mean sea level. Structures and installations <br /> at the site inclade a station building, gasoline dispenser islands under a canopy, two former <br /> underground fuel storage tanks (USTs) and two replacement USTs as shown on Figure 2. <br /> Former UST systems at the site were removed in October 1998. Soil samples, as shown on <br /> Figure 2, were only collected from beneath the USTs because the piping and dispensers "Vere <br /> located above the USTs. Horizon conducted subsurface soil investigations consisting of soil <br /> borings SB-1, SB-2 and SB-3 in 2002 and monitoring well MW-1 in 2003. Soil analytical <br /> data are summarized in Table 1. Horizon has also conducted and reported on quarterly <br /> groundwater monitoring at 6e site since July 2003. Groundwater analytical data are <br /> summarized in Table 2. <br /> 4970 Windplay Drive,#C5 • El Dorado Hills,CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> P.O.Box 5283 • Bakersfield,CA 93388 • (661)589-8389 • FAX(661)589-1456 <br />