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r= ®N COMPANY U.S.A. ]]] <br /> P.O. BOX 4415-HOUSTON, TEXAS 77210-4415 <br /> MARKETING DEPARTMENT r/ <br /> REAL ESTATE S ENGINEERING r� 0 ,.J <br /> ENVi RONMEN TAL ENGINEERING d <br /> dqt' , <br /> .. - <br /> J. KEVIN HUNTER .Q IR i}i L':0 w'titr <br /> MARKETING <br /> ENGINEER C.,�� ' W- rE, 2 17:.1 <br /> !"NvlhiJiYVE.iVTr`OL s1EALrl; <br /> February 27, 1990 PERI-AIT/SERVic S <br /> Former Exxon R/S#: 7-1050 <br /> 904 W. Hammer Lane <br /> Stockton, California 95207 <br /> Mr. Ron Valinoti <br /> San Joaquin County Public Health <br /> 1601 E. Hazelton Ave. <br /> P. 0. Box 2009 <br /> Stockton, California 95201 <br /> Dear Mr. Valinoti : <br /> Attached is a copy. of the revised Problem Assessment j. Report for the referenced site in Stockton, California. Included in the repo t is recent monitoring <br /> i data which indicates the groundwater level is increasing.. The repor <br /> addresses issues raised in your letter of January 5, 1990, and those in the <br /> September 28, 1989, letter from Central Valley RWQCB which was attached. <br /> i <br /> As mentioned above, groundwater measurements taken this month indicate that <br /> water levels have increased and water nc)w exists in all five wells. All five <br /> wel.l:s : [ere.:recently,W_sampled_-and_the�::results:..4re;Jncluded;:In,:the , repoLt. The <br /> water columns in wells MW-4 and MW-5 were insufficient to properly purge the ! <br /> well so the results are not official but are included for reference. Ike will <br /> imonitor water evels weekly to determine if winter rains will <br /> -pr vide enou h <br /> e am les--to e o to ed-from -4 an <br /> the levels continue increasing, <br /> W-5. If <br /> recharge <br /> sing, our camp ing program will continue as <br /> planned. I it a ears that an acce table water column will not be sustained <br /> in the wells, a wor p an w 11 be preparea ro replace the d e f I c en we s. <br /> A significant change in our plans is to include a precautionary soil vapor <br /> survey and vapor-extraction test which is designed to determine if significant <br /> residual hydrocarbons exist in the soil and if vapor extraction is justified. <br /> Should vapor extraction be conducted on. an ongoing basis, the existing wells <br /> wlil be. utillzed such that their use as groundwater monitoring wells will not <br /> be impaired. Additional venting wells may be added if necessary The soil <br /> i vapor work 1s scheduled foe March 12 and we plan to proceed unless we receive <br /> objections from your office. <br /> 4 - - A DIVISION Of EXXON CORPORATION - - - - <br />