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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY ?' \ <br /> ENVIRONMENTAL HEALTH DIVISION •" _ <br /> Karen Furst, M.D., M.P.H., Health Officer P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 CIO <br /> Mr. Robert Murdock <br /> City of Stockton AUG 12 1997 <br /> 425 N EI 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 <br /> (PHSIEHD) has reviewed the July 24, 1997 Site Characterization Report <br /> prepared by the Twining Laboratories, Inc. for the above referenced site. <br /> In the report Twining concludes that a groundwater plume is present with <br /> concentrations approaching the free product range beneath the site, and that the <br /> current network of monitoring wells is inadequate. PHSIEHD concurs with this <br /> conclusion. <br /> Drawing number five of the report is misleading because the gasoline plume <br /> extends beyond SB-1 (5100 ppb) and a southern plume boundary has been <br /> drawn without the support of single datum. The diesel plume may also extend <br /> south of the drawn southern plume boundary and it is also present in SB-1 (2500 <br /> ppb), SB-3 (330 ppb), SB-6 ( 450 ppb). MTBE was present in groundwater <br /> samples from SB-1, SB-2, SB-4, SB-5, and SB-7. <br /> There is lncOnsiStenct between the �eoprob ing to s which describe the <br /> native soil fromg _ t as clams and the boring logs from -1,2 and—d3 <br /> — <br /> native <br /> describe the top 16 feet of the soil profile as sandy. MW-1 as s <br /> surface to 16 feet and clay fromj'§6 ' feed and M1 V-'-2 was clay from 8-13 feet <br /> with sand above and below and1/11-3 as backfill to 12 feet and sand to 30 feet. <br /> Sandy soil facilitates both plume migration and in situ remedial alternatives <br /> There is Mwfttstenfy between the hydropunch analytical results and the <br /> analytical results from M:3.and MW-1. Hydropunch analytical samples <br /> commonly result in increased hydrocarbon concentrations of one to two orders of <br /> magnitude. The difference between the results in SB-1 (2500 ppb TPH , 5100 <br /> A Division of San Joaquin County Health Care Services <br />