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6ETTLER - RYAN INC. <br /> July 9, 1999 <br /> AUG 16 1999 <br /> Mr Brett Hunter ENVIRONMETITAL HEALTH <br /> Chevron Products Company PERMIT/SERVICES <br /> P O Box 6004 <br /> San Ramon, California 94583 <br /> Subject: Addendum To GR's Closure Report For Chevron Service Station #9-.1848, 1257 <br /> Yosemite Avenue,Manteca,California(Report#346392.02,dated January 18, 1999) <br /> Mr Hunter <br /> At the request of Chevron Products Company (Chevron), Gettler-Ryan Inc (GR) has prepared this <br /> addendum to the Closure Report previously prepared for the above referenced site (Figure 2) As <br /> requested by San Joaquin County Public Health Services (SJCPHS) in a letter dated February 17, 1999, <br /> additional information (outlined in the Regional Water Quality Control Board's (RWQCB) Tri-Regional <br /> Board Staff Recommendations For Preliminary Investigation And Evaluation of Underground Storage Tank <br /> Sites, Requests for Closure, dated March 1, 1994) was requested by to evaluate this site for closure The <br /> requested information is presented below <br /> 1 GR submitted with the closure report a list of domestic, municipal, or industrial wells identified <br /> within a 0 5-mile radius of the site Locations of the wells identified are shown on Figure 1 of <br /> GR's Closure Report <br /> 2 GR included in the Closure Report a Site Map (Figure 2) showing former and existing facilities <br /> at the subject site This map is to scale Historical potentiometric maps that show groundwater <br /> elevation contours and gradients are also contained in the Closure Report(Appendix C) Nearby <br /> surface water bodies within a 0 5-mile radius of the site include a canal and several intermittent <br /> streams' The site is surrounded by a shopping mall parking lot to the north, east, and west <br /> Yosemite Avenue is located south of the site <br /> 3 Historical groundwater monitoring data is provided in Appendix B of the Closure Report <br /> Groundwater beneath the site ranges between 10 and 20 feet below groundw surface (bgs) A <br /> graphical presentation of the high and low groundwater levels are shown on the attached geologic <br /> cross-sections (Figure 4) <br /> i U S Geological Survey, 1952, Manteca Quadrangle,California-San Joaquin Co,7 5 Minute Series r, <br /> (Topographic) scale=l 24,000, photorevised 1987,minor revision 1994 <br /> 346392 02 <br /> 6747 Sierra Court , Suite J e Dublin , California 94568 a ( 925 ) 551 -7555 <br />