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1.0 INTRODUCTION <br /> �. The San Joaquin County Public Health Department, Environmental Health Division <br /> (County) requested AT&T Communications (AT&T) to perform a site investigation at the <br /> AT&T Microwave Station located at 110 West 'turner Road (site), Lodi, California (See <br /> Figure 1 - Location Map). The request was made by authority of the Central Valley i <br /> Regional Nater Quality Control Board (Regional Board) Pilot Program for oversight of I <br /> assessment and clean-up activities at contaminated underground sites. <br /> 1.1 Background <br /> On October 29 to 31, 1990, ESE drilled and installed three monitoring wells and two soil <br /> borings on site (see Figure 2 - Site Pian). The %. 'Is were analyzed for Total Extractable <br /> Hydrocarbons (TEH, diesel) and Benzene, Toluene, Ethylbenzene, and Total Xylenes <br /> (BTEX). Ground-water samples taken from the developed wells were also analyzed for <br /> TE1-1 and BTEX by a California Certified Analytical Laboratory in early November, 1990. <br /> Results of ground-water analyses showed low levels for Toluene(0.5 to 1.4 ug/L)and Total <br /> Xylenes (0.6 ug/L) in well MW-2, cross gradient from the former tank excavation. TEH <br /> and other BTEX constituents were nondetectable in wells MW-1 and MW-3. A bailer <br /> rinseate sample also showed a Toluene concentration of 1.2 ug/L. All ground-water <br /> analyses results were below State of California Action Levels for drinking water for Toluene <br /> (100 ug/L); for Xylenes (1750 ug/L). A report of findings was issued to San Joaquin <br /> County for the site assessment on January 15, 1991. <br /> In a January 29, 1991 phone conversation with Ms. Susan Wickham of ESE, Mr. Harlin <br /> Knoll of the County requested a second round of ground water sampling be conducted to <br /> verify the previous November analytical results. <br /> , s <br /> pff M EN Hum <br />