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Roy F.Weston,Inc. - <br /> One Concord Centre,Suite 1580 <br /> 2300 Clayton Road ,- _ - <br /> ® Concord,Caldomia 94520-2148 '.J <br /> MANWWRWDESIGNeRSICONSULTANTS 510-603-7900•Fax 510-603-7901 - 21 August 1997 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 N. San Joaquin Street <br /> Stockton, CA 95201 W.O. 03733-008-001-0001 <br /> Subject: Response to 6 August 1997 Letter from Mary Meays <br /> Dear Ms. Meays: <br /> Enclosed please find a revised copy of Table A-2 as requested in your 6 August letter. We <br /> would also like to clarify the surveying issue noted in the fifth paragraph of your letter. Two <br /> surveys were conducted: 1) MW-1, MW-2, and MW-3 were surveyed relative to an arbitrary <br /> benchmark by WESTON personnel and 2) MW-2A, MW-3A, MW-4, MW-5, MW-6, MW-7, <br /> and MW-8 were surveyed by a licensed surveyor. No single well has been surveyed twice. <br /> Since the location of the arbitrary benchmark is unknown, the 30 December 1988 groundwater <br /> elevations for MW-1, MW-2, and MW-3 cannot be determined reliably. However, groundwater <br /> elevations for all other wells can be used for constructing groundwater table contour maps and <br /> determining changes in groundwater elevations over time. To avoid confusion in the future, <br /> additional foot notes have been added to Table A-2 for MW-1, MW-2, and MW-3 groundwater <br /> elevation measurements. <br /> Please also note that the total depth of well MW-2 as measured during the last sampling event <br /> was 37.40 ft below top of casing or approximately 37.5 ft below ground surface (bgs). <br /> However, according to the MW-2 well log, the bottom of the screened interval is 45 ft bgs. <br /> Therefore, the bottom of well MW-2 has likely collapsed and well MW-2 should be considered <br /> for abandonment. <br /> Please contact me at (510) 603-7917 if you have any questions. <br /> Very truly yours, <br /> ROY F. WESTON, INC. <br /> 7�w <br /> Karla Brasaemle, R.G. <br /> Project Manager <br /> KB/ed <br /> Enclosure <br /> cc: Ellen Aquaro <br />