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C <br /> PUBLICHALTH SERVIaS- "SAN <br /> jOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISIONS <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 • o P <br /> 2091468-3420 <br /> .APR .0 2 '2001 �o.R�,, <br /> DOUG STIDHAM iKULJIT MANGAT <br /> CITY OF ESCALON �' <br /> P O 24$ a P O BOX 35 <br /> ESCALON CA 95320 ESCALON CA 95320 <br /> i <br /> RE: South County Food & Fuel ' <br /> 1305 Escafon Ave SiTE CODE: 1487 <br /> cscalon-CA`95320'�:. <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Report, Additional SiteiCharacterization" (Report) <br /> dated January 30, 2001 and the Corrective Action Plan (Revised) Vadose Zone <br /> Remediation" (CAP) dated February 26, 2001 that were submitted by Geological <br /> Technics Inc. (GTI) on behalf of the above referenced site and has the following <br /> .comments. f�. i,_., ,. <br /> .- v . <br /> The Repo rt.documents site fieldwork that.took.pfaceduring4he week of October <br /> 16720, 2000, to continue.the.investigation of the vertical and'lateral extent of the <br /> petroleum hydrocarbon contaminant.impact.to soil and groundWater at this site. <br /> .Two shallow groundwater monitoring wells; MW-4 and;MW-5, were installed to <br /> first groundwater, one soil boring, SB-101, was advanced to 115 feet below <br /> surface grade (bsg) and one deep monitoring well, MVV-301, was installed to 89 <br /> feet bsg. Soil samples for analysis were collected every five feet during the <br /> drilling of MW-4 and MW-5 and from 75-115 feet bsg during the drilling of SB- <br /> 101. Results of the soil analyses were non-detect for all petroleum hydrocarbon <br /> constituents analyzed, with the exception of 4,230 milligrams per kilogram <br /> (mg/kg) total petroleum hydrocarbons (TPH) as diesel in the 65.5-66 foot,bsg;, <br /> "'sarriple from'MW-5. 'The'laboratoiy reported that the pa#tern was not typical of <br /> diesel and that the sample contained visible streaks of a white, odorless, greasy <br /> substance. An explanation of why this sample was analyzed for TPHd and what . <br /> the white substance may be was not included in the report. <br /> The new wells were developed and sampled on December 1, 2000 during' a <br /> routine quarterly monitoring event (GTI Report, Groundwater Monitoring 41h <br /> Quarter 2000, dated December 27, 2000). Analytical results from that event. <br /> showed consistent.trends in the levels of contaminants.'present'in MW-1, ' W-2 <br /> and.MW-3-and in the.direction of-the shallow groundwaterflow, which is to the r <br /> west/northwest: MW-4 was non-detect for all constituents analyzed. MW'.5 <br /> reported 177 micrograms per litre (µg/1) TPH as gasoline. MW-101 had 852 µg/1 <br /> TPH.gasoline, 3 �tg/l benzene, 45 µg/I toluene, 14 ug/i ethyl benzene, 84 µg/I <br /> xylene and 54 �g/l methyl tertiary butyl ether (MtBE). Is <br /> A Division of San Joaquin County Health Care Services <br />