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PUBLIC ITEALTH <br /> SERVICESFILE <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> .� <br /> Karen Furst M.D. �. ` <br /> M.P.H., Health Officer • � ` • <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 APR 0 2 "2001 `'FORS <br /> DOUG STIDHAM <br /> CITY OF ESCALON KULJIT MANGAT <br /> P O 248 P O BOX 35 <br /> ESCALON CA 95320 ESCALON CA 95320 <br /> RE: South County Food & Fuel <br /> 1305 Escalon Ave SITE CODE: 14$7 <br /> Escalon CA 95320 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Report, Additional Site Characterization" (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. <br /> The Report documents site'fieldwork that took place during the week of October <br /> 16-20, 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, MW-101, 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 /> sample from MW-5. The laboratory reported that the pattern 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, MW-2 <br /> and MW-3 and in the direction of the shallow groundwater flow, which is to the <br /> west/northwest. MW-4 was non-detect for all constituents analyzed. MW-5 <br /> reported 177 micrograms per litre (pg/1) TPH as gasoline. MW-101 had 852 pg/I <br /> TPH gasoline, 3 pg/l benzene, 45 pg/I toluene, 14 pg/I ethyl benzene, 84 pg/I <br /> xylene and 54 pg/I methyl tertiary butyl ether (MtBE). <br /> A Division of San Joaquin County Health Care Services <br />