|
QU�N
<br /> pUBLIC HSERVIaS
<br /> SAN JOAQUIN COUNTY
<br /> ENVIRONMENTAL HEALTH DIVISION ;
<br /> Karen Furst, M.D., M.P.H., Health Officer
<br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202
<br /> 2091468-3420 C(Oply
<br /> JAMES GIOTTONINI MAR 2 9 2000
<br /> PUBLIC WORKS DIRECTOR
<br /> CITY OF STOCKTON
<br /> 425 N EL DORADO ST
<br /> STOCKTON CA 95202
<br /> Re: VAN BUSKIRK GOLF COURSE Site Code: 1146
<br /> 1740 HOUSTON AVENUE
<br /> Stockton, CA 95206
<br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed
<br /> Quarterly Ground Water Monitoring Report—November 1999 dated February 7,2000 prepared by
<br /> Advanced GeoEnvironmental,Inc. (AGE). Analytical results of water samples collected from
<br /> Monitoring Well#1 (MW-1),MW-2,MW-3, and MW-5 were all non-detect at below the detection limits
<br /> of aromatic hydrocarbons as Benzene, Toluene, Ethyl-benzene, and Xylenes (BTEX collectively), Total
<br /> Petroleum Hydrocarbons as Gasoline (TPH-G) and as Diesel (TPH-D),Methyl-tert Butyl Ether
<br /> (MTBE), and tertiary Butanol. Analytical results of the water sample collected from MW-4 were 1,100
<br /> parts per billion (ppb) of MTBE, 7.7 ppb of Benzene, and 61 ppb of TPH-D. MTBE was also detected
<br /> in the May 1999 MW-4 sample at 660 ppb, and August 1999 MW-4 sample at 340 ppb. Depth to
<br /> groundwater was measured at 11.48 feet below surface grade (bsg) and has fallen from 8.10 feet bsg in
<br /> May 1999. Groundwater flow gradient has been calculated to be toward the north as reported in the
<br /> last three quarterly monitoring reports (QMR).
<br /> The report Site Characterization dated July 24, 1997 prepared by Twining Laboratories,Inc.
<br /> documented the result of seven soil borings advanced on December 19, 1996 to investigate the extent of
<br /> the contamination. Analytical results of the grab water sample collected from SB-5 (located
<br /> approximately five feet north of MW-3) were 6,500, 35,000,4,500, and 25,000 ppb of BTEX,
<br /> respectively,93,000 ppb of TPH-G,320,000 ppb of TPH-D, and 560 ppb of MTBE. Analytical results
<br /> of the soil sample collected at 16 feet bsg from SB-5 were 22, 50, 16, and 110 parts per million (ppm) of
<br /> BTEX, respectively, 1,100 ppm of TPH-G, 16 ppm of TPH-D,and 0.16 ppm of MTBE. Analytical
<br /> results of soil samples collected from SB-4 (located south of both gas and the diesel tanks) were 150 ppm
<br /> of TPH-G at 10 feet bsg and 38 ppm of TPH-G at 16 feet bsg. Analytical results of the soil samples of
<br /> the remaining 5 borings collected at 10 feet and 16 feet bsg were mostly non-detect at less than detection
<br /> limits for all analytes. MTBE was detected in the grab water samples collected from SB-2, 3, and 7.
<br /> Additional soil investigation was conducted during the April 1999 installation of MW-4 and MW-5 to
<br /> delineate the extent of the contamination and the result was documented in Additional Soil and Ground
<br /> Water Assessment Report dated June 30, 1999 prepared by AGE. Eleven soil samples collected from 5
<br /> borings at between 8.5 feet bsg and 20 feet bsg were analyzed. Analytical results of the soil samples
<br /> collected from Boring#4 (B-4) were 65 ppb of MTBE at 17.5 feet bsg, 110 ppb of MTBE at 20 feet bsg,
<br /> and non-detect at below the detection limit for BTEX, TPH-G,TPH-D, and all oxygenates other than
<br /> MTBE. Analytical results were non-detect at below the detection limit for all remaining soil samples.
<br /> The soil
<br /> A Division of San Joaquin County Health Care Services
<br />
|