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Brown and Caldw a <br /> Consultants <br /> 723 5 Street <br /> Sacramento <br /> California 95814-7092 <br /> (916)444-0123 <br /> FAX(916)444-8437 <br /> March 9, 1990C E I V'- D <br /> MAR 15 1990 <br /> Ms. Diane Henson ;NVIRONMENTAL HEALTH <br /> San Joaquin Local Health District PERMIT/SERVICES <br /> Environmental Health Department <br /> 1601 East Hazelton A <br /> Stockton, California 95201 017-3214-42/1 <br /> Subject: Discontinuation of Monthly Groundwater Sampling, ARCO Station 434, <br /> -=501-Ketticnian Lane, Lodi,.California=— <br /> Dear <br /> alifornia=Dear Ms. Henson: <br /> This letter is to inform you that ARCO Products Company (ARCO) will discontinue monthly <br /> sampling of groundwater monitoring well W-213 at ARCO Station 434. ARCO will continue <br /> quarterly sampling of the ten groundwater monitoring wells located on and off the site. <br /> Well W-2B has been sampled monthly since May 1989, at the request of the California Regional <br /> Water Quality Control Board, Central Valley Region to monitor the deeper groundwater at the <br /> site. The results from monitoring well W-2B show that since October 1988, benzene and toluene <br /> concentrations have been below the State Maximum Contaminant Levels (MCLs). Concentra- <br /> tions of ethylbenzene and xylene have been below state MCLs since sampling began in June <br /> 1988. Table 1 presents the analytical results from W-2B from June 1988 to October 1989. <br /> We believe that the monthly monitoring of W-213 has shown that hydrocarbon constituents do <br /> not fluctuate significantly over time and are preseni t in concentrations which do not warrant <br /> continued monthly sampling. <br /> If you have any questions regarding this letter, please call me at (916) 444-0123 .. a <br /> Very truly yours, <br /> BROWN AND CALDWELL <br /> Jay Lucas <br /> Project Manager <br /> JL:LAM:mkw <br /> cc: Mr. Kyle Christie, ARCO Products Company <br /> Mr. Tom Peltier, California Regional Water Quality Control Board, Central Valley Region <br /> Mr. Chris Winsor, ARCO Products Company <br />