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Nov 24 C3 G5: 26p GN ENGINEERING 53086-3108 P. 1 <br /> h;. rlEALTN <br /> FAX MEMORANDUM 03 NOV 25 AM 8` 04 rn <br /> DATE: November 24, 2003 ■ t , <br /> TO: Ms. Lori Duncan ENGINEERING, INC <br /> San Joaquin County <br /> Environmental Health Division <br /> FROM: Thomas E. Ballard <br /> FAX#: 209-464-0138 <br /> PC'D: Mr. Jay McIlrath ( zdti) 4to7 -W71 <br /> SUBJECT: JAMAR SERVICE <br /> 4075 EAST MAIN <br /> STOCKTON, CALIFORNIA <br /> Message: Upon additional review of the Cone Penetrometer(CPT) logs, groundwater <br /> gradient information and analytical data for this site,GHH feels that the well cluster <br /> proposed southeast of MW-7A and MW-713 should be more appropriately located to the <br /> east of the MW-7 well cluster, approximately on the sidewalk south of Adelbert Ave. <br /> The rationale for this location is that the sand zones in the deeper sediments(between 100 <br /> and 110 feet below ground surface) do not appear to extend to the south of East Main <br /> Street to any degree,however, they are considerably thicker in the vicinity of the MW-6 <br /> monitoring well cluster and this is what appears to account for the higher MTBE <br /> concentrations in groundwater at this location. MTBE concentrations are substantially <br /> lower to the south of East Main Street due to the lack any substantial thicknesses of sand <br /> in the deeper sediments this area,which appears to prohibit the migration of MTBE in <br /> that direction. <br /> To adequately define the extent of the plume,GHH recommends relocating the well <br /> cluster as originally proposed on the south side of East Main Street to the south of <br /> Adelbert Avenue. <br /> If you have any questions or need additio oFo on,please call me at(530) 886- <br /> 3100. <br /> a• c <br /> N <br /> Thank You, rNon�s�94o + <br /> 'P No.7299 <br /> /U SCP CAL1fOP\ <br /> 11960 Heritage Oak Place,Suite 213,Auburn,CA 95603,Telephone(530)886-3100 Fax(530)886-3108 <br /> I <br />