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Advanced (r `? <br /> GeoEnvironmental, Inc . -Y==- <br /> 29 August 2001 <br /> AGE-NC Project No. 98-0426 <br /> Mr. Jeff Wong <br /> SAN JOAQUIN COUNTY PHS-EHD a <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton, California 95202 <br /> Subject: Monitoring Well Installation Work Plan - Modified Addendum <br /> CHARLIE'S DAY & NITE _ <br /> 706 North El Dorado Street, Stockton, California <br /> Cil <br /> Dear Mr. Wong: <br /> At your request,Advanced GeoEnvironmental, Inc. (AGE) has modified the work plan addendum <br /> dated 19 April 2000 for the installation of two additional ground water monitoring wells at 106 <br /> North E1 Dorado Street,Stockton, California. The site setting is illustrated in Figure 1. A plan of the <br /> site is illustrated on Figure 2. <br /> This work plan addendum is prepared in accordance with Central Valley Regional Water Quality <br /> Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) <br /> sites. Background information for the site was summarized in Preliminary Investigation and <br /> Evaluation Report - March 1999, prepared by AGE. <br /> SCOPE OF WORK <br /> Based on the results of laboratory analysis of soil and ground water samples collected during <br /> previous site assessment activities, additional assessment is required to determine the lateral extent <br /> of the hydrocarbon-impacted ground water northeast of the former UST location and the vertical <br /> extent near the former UST location and MW-3. <br /> According to the 19 April 2000 addendum, the first monitoring well (temporary designation "A.") <br /> was to be installed 15 feet northeast of MW-3 to a depth of approximately 60 feet bsg and completed <br /> with 5 feet of slotted casing(the proposed screened interval was based on a possible confining layer <br /> encountered at a depth of 50 feet in boring B-1);the second monitoring well(temporary designation <br /> "B")was to be installed approximately 30 feet northeast of MW-3 to a depth of 35 feet below surface <br /> grade and completed with 20 feet of slotted casing. The originally proposed monitoring well <br /> locations are illustrated on Figure 2. However, in subsequent conversations between yourself and <br /> 3 SImw Rawl. Si i. (1d, ), 1 <br /> Tdcphone A()__1000 FAX (209) -i(';-1 !ti <br />