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r. <br />PHILIP <br />-J 13 11111 iTi 1 :110 <br />,—•..� "4 31[7`"_ ,hose <br />r: ��a4a�.� ,,NTAL HEA1_11i <br />: SERVICE Industrial Services Group SPR°,^i T May 13, 1998 <br />Midwest Region 98 1'x'1 r, 20 . PMS 12: 28 Project 121382eg/125997 - <br />Mr. Ron Rowe <br />San Joaquin County Public Health Services <br />Environmental Health Division -Site Mitigation Unit <br />304 E. Weber Avenue, Third Floor <br />P.O. Box 388 <br />Stockton, California 95201-0388 <br />Dear Mr. Rowe: <br />Subject: Proposed Groundwater Monitoring Modifications <br />The Earthgrains Company Facility - <br />2651 South Airport Way — Stockton, California <br />As discussed during our May. 13, 1998 telephone conversation, we are proposing <br />modifications to our current groundwater monitoring program at the subject site. These <br />modifications include monitoring groundwater on a semi-annual basis, reducing the <br />number of monitoring wells sampled, and eliminating total petroleum hydrocarbons - <br />gasoline from the analytical schedule. These modifications are proposed until San <br />Joaquin County and the California Regional Water Control Board establishes oxygenate <br />compound guidance for UST case closure that would be applicable to this site. <br />Because groundwater has been monitored at this site since 1987, we are of the opinion <br />that continued quarterly characterization of subsurface conditions is unnecessary. We are <br />proposing that monitoring wells MW -1, MW-5,.MW-7, MW -8, MW -11, MW -12, and <br />MW -13 be sampled semi-annually, and that samples be analyzed for BTEX and <br />oxygenates compounds using modified Method 8260. We are tentatively scheduled to <br />perform site groundwater monitoring on May 22, 1998, and subsequently in November <br />1998. <br />If you have any questions or comments regarding this proposal, please write or call me at <br />(618) 281-7173, extension 1241. Your cooperation in this matter is appreciated. <br />Sincerely yours, <br />PHILIP SERVICES CORP. <br />Mark F. Milward <br />Hydrogeologist <br />/vgc/MONMOD.DOC <br />PHILIP ENVIRONMENTAL SERVICES CORPORATION <br />210 %lest Sand Bank Road • P.O. Box 230 • Columbia, IL 62236-0230 �q <br />(618) 281-7173 • (800) 733-7173 • Fax (618) 281-5120 <br />