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PUBLIC HEALTH SERVICESUq it <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D.; M.P.H., Health Officer , �p. <br /> d Floor r • Stockton, 2 %FOR`' <br /> 304 East Weber Avenue, oo CA 952 <br /> 0 <br /> 209/468-3420 <br /> c(apy <br /> JEFF GRANBERRY <br /> SHELL OIL CO SEP 0 4 1998 <br /> PO BOX 8080 <br /> MARTINEZ CA 94553 <br /> RE: WATERLOO SHELL SITE CODE: 1760 <br /> 4315 WATERLOO ROAD <br /> STOCKTON CA 95205 <br /> San Joaquin County Public Health Services Environmental Health Division . <br /> (PHS/EHD) has discussed this site with Cambria Environmental Technology Inc. <br /> and agree that the vertical extent of the MTBE contamination appears to be <br /> limited to 30 feet below surface grade (bsg) and the petroleum hydrocarbon <br /> contamination appears to be limited to 37 feet bsg. <br /> Current groundwater level is approximately 60 feet bsg. The historical high <br /> groundwater level of the area recorded in 1986 was approximately 50 feet bsg, <br /> and the historical low recorded in 1979 was between 80 and 90 feet bsg. <br /> It has been discussed that the contamination should remain in place and that <br /> further investigation or remediation not be required. Submit a closure report with <br /> analytical data, rationale for closure, and mass calculation of the contamination <br /> left in place to PHS/EHD by October 15, 1998. <br /> If you have any questions, please feel free to contact Jeffrey Wong at (209) 468- <br /> 0335. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Jeffrey Wong, EHS, Trainee Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region - Mark List <br /> c: Cambria - Joe Neely <br />'I <br /> A Division of San4 County 1oun oa uin CHealth Care Services <br />