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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> KI KHANNA M.D,M.P.H. H: ` <br /> Health Officer <br /> P.O. Box 2009 0 (1601 East Hazelton Avenuc) • Stockton, California 95201 044:i Fo.0o, <br /> (209) 468-3400 <br /> PETER D'AMICO <br /> THRIFTY OIL <br /> 10000 LAKEWOOD BLVD <br /> DOWNEY CA 90240 OCT 19 199•' <br /> RE: BP #172 (formerly Thrifty Oil) SITE CODE: 1227 <br /> 7647 Pacific Ave. <br /> Stockton, CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division(PHS/EHD) has <br /> reviewed the quarterly monitoring report for the second quarter of 1993 for the groundwater <br /> sampling event of May 20, 1993, and has the following comments. <br /> Quarterly reports are due by the 15th of the month following the quarter's end. Ending <br /> quarterly periods for this site are March, June, September, and December. Please adjust <br /> your witnessed sampling events so that adequate time for your review will allow for report <br /> receipt at PHS/EHD by the required time. <br /> In correspondence from PHS/EHD dated April 24, 1992, and again on March 2, 1993, you <br /> were directed to utilize analytical detection limits for TPH-G and BTEX as listed in the <br /> Regional Board Staff recommendations. Quarterly reports for both the first quarter and <br /> second quarter 1993 did not reflect this directive and utilized incorrect detection limits for <br /> Xylene and TPH-G. The correct detection limit for Xylene in a water matrix is 0.5 ug/l and <br /> 50.0 ug/1 for TPH-G in water. <br /> Groundwater gradient information in the quarterly report is to include not only gradient <br /> direction but also the flow rate in horizontal feet per vertical feet. Include this information <br /> in your next report due now. <br /> An updated workplan replacing the April 14, 1992 workplan was due April 15, 1993. No <br /> workplan has been received to date.The levels of groundwater contamination have increased <br /> in monitoring wells MW1, MW2, and MW3. <br /> Installation of additional wells to define the extent of the plume of contaminated <br /> groundwater is essential. A workplan for these monitoring wells is to be submitted <br /> immediately. <br /> A Division of San Joaquin County Health rare Services �� <br />