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05/13/88 WED 12:52 FAX 16182815120 PHILIP ENVIRONMENTAL Ia002 <br />PHILIP <br />Industrial Service., Group <br />Midwest Region <br />Mr. Ron Rowe <br />San Joaquin County Public Health Services <br />Environmental Health Division -Site Mitigation Unit <br />304 E. Weber Avenue, Thad Floor <br />P.O. Box 388 <br />Stockton, California 95201-0388 <br />Dear Mr. Rowe: <br />May 13, 1998 <br />Project 121382eg/125997 <br />Subject: Proposed Groundwater Monitoring Modifications <br />The Earthgraias Company Facility <br />2651 South Airport Way — Stockton, California <br />As discussed during our May 13, 1998 telephone conversation, we aro 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 arc proposed until San <br />Joaquin County and the California Regional Water Control hoard 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 />that monitoring wells MW -1, MW -5, MW -7, MW -8, MW -11, MW -12, and <br />MW -13 be sampled semi-atmually, and that samples be analyzed for BTEJC and <br />oxygenates compounds using modified Method 8260. We arc 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 <br />SERVICES CORP. <br />Mark F. Milward <br />Hydrogcologist <br />lv9c7MONMOD.DOC <br />PHILIP FWlkONMEN'fRL SERVICES CORPORA)ION <br />210 West Sand Bank Road • P.O. Box 230 • Culumbia, It. 62236-0230 <br />(616) 231-7173 • tBCO) 733-7173 - Fa (518) 281-5720 <br />