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Mike Infurna AINrom Thomas Parker[tparker@secor cam] Awl ant Wednesday, July 03, 2002 1 45 PM o minfurna@stcehd com Cc rbenkosky@secor com, Ed Ralston Subject Tosco 1205 N p6e etre S206351 Tosco Stepout revrsed pdf 1205 Lathrop rec Mike, Attached are the analytical data and a revised site plan for the second round of the Geoprobe assessment at Tosco 1205, located at 16470 Cambridge Drive in Lathrop While taking the groundwater samples, GP-7 appeared to be clean and GP-8 had a strong odor So, I dial not do the additional step-out boing GP-9 on the previous map I did do an additional step-out boring (originally named GP-10) and named it GP-9 to keep the boring order I also moved that step-out boring to the north as far as my USA marks would allow I revised the site map showing these changes The following are the analytical results GP-6, TPHg <50 ppb, benzene <0 50 ppb, MtBE <0 50 ppb GP-7, TPHg <50 ppb, benzene <0 50 ppb, MtBE <0 50 ppb GP-8, TPHg 15, 000 ppb, benzene 110 ppb, MtBE 230 ppb, ethylbenzene 740 ppb, Dotal xylenes 1,300 ppb GP-9, TPHg <50 ppb, benzene <0 50 ppb, MtBE 2 2 ppb, ethylbenzene 0 96 ppb, total xylenes 1 2 ppb We will be proposing six off-sate wells to delineate the plume I will have to obtain an encroachment permit for the three additional wells and then I will permit all sax wells through you I expect to send you an addendum to the workplan outlining this scope of work next week Also, concerning Tosco 4409 located at 1502 E1 Dorado Street in Stockton, Rusty checked the files and at does not appear that dissolved lead has been analyzed for Please call or e-mail me if you have any questions Sincerely, Thomas Y Parker Staff Geologist SECOR International, Inc 3017 Kilgore Road, Suite 100 Rancho Cordova, CA 95760 (916) 861-0400, ext 232 (916) 861-0430 FAX I •I