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�IT..IJy]i\ <br /> PUBLIC HEALTH Sl' <br /> ,E ° V SANJOAQUIN COUNTY ICES <br /> k t. <br /> X <br /> JOG]KHANNA AN[D.,AP,H. a <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) • Stockton, California 95201 i F o a e► <br /> (209) 46&3400 <br /> SCOTT VINCENT <br /> cu <br /> �� . <br /> AMERICAN REAL ESTATE GROUP � � <br /> 3102 OAK LAWN, SUITE 900 U <br /> DALLAS, TEXAS 75219 DEC 09 <br /> k <br /> RE: 1235 E. Alpine p i� SITE CODE: 151.2 <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed the review oaf the "Quarterly <br /> Monitoring Report" dated November 13, 1942 submitted by Weston <br /> Consultants. The following are comments <br /> ion that report and also <br /> a summary of items addressed in a meeting held on November 20, F <br /> 1992 at the office of PHS/EHD between representatives of American ) <br /> Real Estate Group, Weston Consultants and PHS,/EHD. <br /> Over-excavation of the former tank pit a ga, as proposed in the I <br /> report, will remove a significant volume "of contaminated soil and <br /> lessen the impact to groundwater qualitytin t!he future. As <br /> discussed at the meeting, before the 30 d`aypublic participation <br /> period can begin an "Executive Summary" will ' <br /> need to be submitted <br /> to this office. The "Executive Summary" ' hou!ld detail the over- <br /> excavation activities proposed for this siite and should include a <br /> time schedule for the backfilling of the excavation and the <br /> disposal of the soil after the over-excavation activities are <br /> complete. <br /> p <br /> Also discussed at the meeting was the need t6 assess the soil in <br /> the deeper unsaturated zone where a contaminated groundwater <br /> plume may have receded and deposited hydrocarbons in the soil. <br /> San Joaquin County Flood Control Maps (Spring�� 1983 , 1986) record <br /> the seasonal high depth to groundwater far this area to be <br /> approximately 40 feet below ground surface (B;GS) . Currently the <br /> depth to groundwater is between 82 .7 feet= BGSand 85.4 feet BGS <br /> at this site. This indicates a drop in the water table of over <br /> 40 feet in the last six years. This secondary soil contamination <br /> plume, once identified, shall be addressed inl� future remediation <br /> efforts at the site. �F <br /> Also, the need for an additional downgrad!ientjmonitoring well was <br /> discussed and will be reevaluated after additional groundwater <br /> sampling data becomes available. 1 <br /> Several alternatives for mitigating the sil and groundwater <br /> contamination at this site should be considered and evaluated at <br /> A Division of San Joaquin County Health(are Services �I <br />