Laserfiche WebLink
Science & <br /> �i Englneering, Inc. <br /> December 18, 1992 <br /> Project No. 6-90-5030 <br /> Mr. Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, California, 95201 <br /> SUBJECT: AT&T Lodi Facility, J110 West Turner Road, Lodi, San Joaquin County, <br /> California (San Joaquin County Site Code No. 1741) <br /> Dear Mr. Knoll: <br /> Environmental Science & Engineering, Inc. (ESE) requests that San Joaquin County Public <br /> Health Services Environmental Health Division (County) reconsider your suggestion to <br /> install an additional ground water monitoring well at the subject site (Figure 1 - Site Plan). <br /> In reference to our telephone conversation on December 14, 1992, you recommended the <br /> installation of one ground water monitoring well south-southeast of the existing ground <br /> water monitoring well MW-2 and west of the limit of the former backfill. However, in a <br /> letter from the San Joaquin County Public Health Services, Environmental Health Division <br /> (County), mention is made to perform further assessment in the area of boring B-2Y. <br /> In late October and early November, 1990 ESE drilled five borings (three were converted <br /> to monitoring wells) within and near the former excavation (Figure 3 - Worksite Plan). <br /> Soil boring B-2Y was terminated at an approximate depth of 15 feet below ground surface <br /> (bgs) due to auger refusal by construction debris which may represent fragments of backfill <br /> material or remnants of the grade fill seal. In fact, a composite grab sample of soil cuttings <br /> reported to contain asphalt chips was collected at the direction of a County representative <br /> and analyzed. Concentration of Total Petroleum Hydrocarbons as Diesel (TPH-D) was <br /> reported at 110 milligrams per Kilogram (mg/Kg) in this soil sample. Moreover, the <br /> analytical results of soil samples collected from soil borings MW-1, MW-2, and MW-3, later <br /> converted to ground water monitoring wells, and B-2X reported concentrations of TPH-D <br /> less than 4 mg/Kg. <br /> $090 Nel�,c,n A%envie.Suitt'I Cnnrurd.C A'44-'20 11101W <br />