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FILE COPY <br /> PUBLIC HEALTHSERVICtS <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 /> 209/468-3420 <br /> RUTH STRONG JAN 16 2001 <br /> RUTH STRONG PROPERTY <br /> 330 E HOLLYWOOD <br /> TRACY CA 95376 <br /> RE: RUTH STRONG PROPERTY SITE CODE: 2054 <br /> 5157 W BUSINESS LOOP 205 <br /> TRACY CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) has <br /> reviewed Quarterly Report—Fourth Quarter 2000 dated December 21, 2000, prepared by <br /> Advanced Geo Environmental, Inc. (AGE)for the above referenced site. Four monitoring wells <br /> (MW-1, -2, -3, and -4)were installed at the site in July 1998, and MW-5 and MW-6 were added in <br /> May 2000. The level of groundwater in MW-2 has decreased from 28.69 feet in October 1998 to <br /> 28.09 in December 2000, although MW-1 has decreased by more than 2 feet over the same <br /> period. The groundwater flow direction has been typically northwestward with occasional swings <br /> to the north. Groundwater flow gradient was calculated to be around 0.01 in 1998 and 1999, and <br /> 0.003 in September 1999. The groundwater flow gradient is currently at 0.007 ft/ft. MW-2 is <br /> located approximately 15 feet northwest of the southern most underground storage tank (UST) <br /> cluster(Tanks#2, 4, and 5). MW-5 is approximately 50 feet north of MW-2, and MW-6 is <br /> approximately 50 feet east-northeast of MW-2. MW-1 is southeast of MW-2 and at the edge of <br /> the above-mentioned tank cluster. Analytical results of the water samples of MW-1, -2, -5, and -6 <br /> from July 1998 and December 2000 are as follows: <br /> Total Petroleum H drocarbon as Gasoline TPH- concentration in !I: <br /> MW-1 MW-2 MW-5 MW-6 <br /> Jul 1998 <50 2,400 ---- ---- <br /> Oct 1998 <50 5,800 ---- <br /> 0 <br /> --- ---" <br /> Jan 1999 <50 2,700 ---- ---- <br /> June 1999 <50 230 ---- '--- <br /> Se t 1999 <50 130 ---- 2 <br /> May 2000 <50 99 2,200 2,100 <br /> Aug2000 <50 <50 11,000 5,100 <br /> Dec 2000 74 2800 2,100 410 <br /> Benzene concentration in 11: <br /> MW4 MW-2 MW-5 MW-6 <br /> July 1998 <0.5 <0.5 ---- ---- <br /> Oct 1998 0.77 1,200 ---- --'- <br /> .fan 1999 <0.5 340 ---- ---- <br /> June 1999 <0.5 27 ---- ---- <br /> Se t 1999 <0,5 19 ---- <br /> May 2000 <0.5 15 110 0.55 <br /> Aug2000 <br /> <0.5 7.7 690 <1.0 <br /> Dec 2000 0.58 340 98 <0.5 <br /> Analytical results of MW-3 and MW-4 are not included in the table above because they were <br /> primarily non-detect. <br /> A Division of San Joaquin County Health Care Services <br />