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' I <br /> URS [RECENE10 <br /> FEB 1 �',,, FEB 1 1 2003 <br /> ENVIRONIt11t1 <br /> ENVIBONMENI HEALTH <br /> February 4, 2003 pERMITJSEVA',IluiK-RMIT/SERVICES <br /> Ms Lor Duncan 04493 <br /> San Joaquin County Environmental Health Department 06 a4 <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> Re: Monitoring Well Installation Report <br /> Former ARCO Service Station#4493 <br /> 205 North Center Street <br /> Stockton, California <br /> Dear Ms Duncan <br /> URS Corporation Americas (URS) has prepared this report on behalf of Atlantic Richfield Company <br /> (ARCO) to document the installation of one dual completion groundwater monitoring well at the former <br /> ARCO Service Station#4493 in Stockton, California(Figures 1 and 2) The purpose of this work was to <br /> install groundwater monitoring wells to evaluate the vertical and lateral extent of gasoline hydrocarbons <br /> downgradient(east) of the ARCO service station that was formerly Iocated on the western side of Channel <br /> Street The additional downgradient monitoring wells were installed as requested by the San Joaquin County <br /> Environmental Health Department(SJCEHD) in the letter dated July 24, 2002 (Attachment A) This work <br /> was performed as described in the URS Work Plan for Monitoring Well Installation dated June 11, 2002, <br /> and the URS Work Plan Addendum for Dual Completion Monitoring Wells, dated October 17, 2002 The <br /> URS workplans were approved by the SJCEHD (Attachment A) <br /> Given the unexpected presence of multiple abandoned utility lines beneath Channel Street and the presence <br /> of active utility lines beneath the sidewalk to the north of Channel Street, the dual-completion groundwater <br /> monitoring well that was proposed near the northwestern corner of Channel and El Dorado Streets could not <br /> be installed See Figure 2 for the location of underground utilities <br /> SITE BACKGROUND <br /> Former ARCO Station#4493 is located at 205 North Center Street in Stockton, California Three 12,000- <br /> gallon underground storage tanks(USTs) were installed at the site in 1984 The service station is currently <br /> inactive and was demolished during the first quarter of 1999 The site is located on property identified as <br /> Weber Point, and the Stockton Channel is adjacent to the site to the south The City of Stockton has <br /> redeveloped the Weber Point area as a city park <br /> URS Group Inc <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive Suite 300 <br /> Sacramento CA 95833 <br /> Tel 916 679 2000 <br /> Fax 916 679 2900 K V5 BP ARC0104493%Regulatory Correspondence14493 WIR doe <br />