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PUBL� HEALTH SEA,, (ICES ��P �o.L <br /> SAN JOAQUIN MINTY I <br /> L <br /> JOGI KHANNA\I.D.,1I-P 14 <br /> Health Officer <br /> i;g b* <br /> F.O. Box 2009 0 (1601 East Hazelton Avenue) Stokton, C,affomia 95201 <br /> (209)468.3400 <br /> JOHN STROH <br /> SAN JOAQUIN COUNTY <br /> MOSQUITO ABATMENT DISTRICT 0 LD <br /> 5503 S AIRPORT WAY Lo <br /> i(,,! <br /> FEB 1 .0 1992 <br /> STOCKTON CA 95266 <br /> RE: Mosquito Abatement District REFER TO SITE CODE: 1849 <br /> 200 N. Beckman Rd. <br /> Lodi, CA <br /> Please be advised that this office has reviewed activities to <br /> date at the above referenced facility. in 1486, three <br /> underground fuel storage tanks were removed and much of the <br /> contaminated soil was excavated. . In 1981, WLss Associates <br /> submitted a "Groundwater Investigation R4'portll . Three monitoring <br /> wells were installed and sampled. Contamination was not detected <br /> in groundwater samples. However, soil contamination was present <br /> at 31 feet below surface (up to 3 ,800 pa ts per million (ppm) <br /> total petroleum hydrocarbons; xylene, 220 ppm; toluene, 79 ppm, <br /> benzene, 8.7 ppm) . <br /> This office has recently reviewed a "Quarterly Report" submitted <br /> by Weston Consultants. Of the three monitoring wells sampled, <br /> two were dry and one was almost dry and riot capable of producing <br /> a representative sample. <br /> At this time, San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) requests that a work plan <br /> be submitted by March 6, 1992, to construct a downgradient <br /> monitoring well. (See attached Figure 2 for description of known <br /> soil contaminants as related to monitoring wells. ) It is <br /> important that this well be constructed and sampled since <br /> contaminated soil has been left in placell <br /> Consideration should be given to addressing the remaining <br /> contaminated soil. The dry monitoring wells ;I)could be used for <br /> vapor extraction during remediation. A �'Vorkll I plan should be <br /> submitted prior to beginning any remediation., <br /> Pursuant to Section 2652 (d) of the Under4rouhd Storage Tank <br /> Regulations (California Code of Regulati6ns, lTitle 23, Subchapter <br /> 16) a quarterly monitoring report shall lie submitted to Public <br /> Health Services, Environmental Health Divisio"n and Central Valley <br /> Regional Water Quality Control Board (CVRWQCB" ) until the <br /> investigation and cleanup of the site is deem"ed adequate. The <br /> report is to show the: <br /> A DhIsiork of San Joaquin County Health Care kMces, Cl <br />