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PUBLIC "'-flEALTH <br /> PaU-" <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officerq`�Fo �P i <br /> 445 N. San Joaquin Street • P.O. Box 388 Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> I <br /> JOHN YOUNGER � <br /> DISALVO TRUCKING <br /> PO BOX 193765 <br /> SAN FRANCISCO CA 94119-3765 'JAN 0 19'0 <br /> RE: DiSalvo Trucking SITE CODE: 1638 <br /> 1444 Lathrop Road <br /> Lathrop CA 95330 <br /> San Joaquin County Public Health Services Enviro nental Health Division (PHSIEHD) has <br /> reviewed the Groundwater Investigation Workplan, dated September 27, 1994, and submitted <br /> by Condor Earth Technologies, Inc. for the above re renced site. <br /> Phase I of the investigation consists of obtaining one hydropunch groundwater sample to <br /> determine if there is potential for groundwater contanination at this site. Currently there is <br /> evidence of contamination at the capillary fringe. The result of the laboratory analysis of the <br /> soil sample obtained from the bottom of the tank pit t 15.5 feet, in moist soil, for Toluene is <br /> .0062 parts per million (ppm). This exceeds the de t ction limit in soil of .005 ppm and the <br /> detection limit of .3 parts per billion (ppb) in groundater for this constituent. The result of <br /> the laboratory analysis of the same sample for Xylene is 10 ppb. This exceeds the-detection <br /> limit of .6 ppb for Xylene in groundwater. In addition, San Joaquin County flood control maps <br /> indicate that groundwater at this site has been as shall w as 10 feet in this area of the county. <br /> When all of the data is evaluated, it appears that the potential for groundwater contamination is <br /> present. A groundwater investigation is required to determine the condition of groundwater <br /> beneath this site. <br /> A <br /> The second phase of the investigation consists of installing three monitoring wells in a triangular <br /> pattern around the east end of tank 4. The purpose 1br installing three wells is to triangulate <br /> the groundwater contours. One of these wells must be within 10 feet of the former tank pit. <br /> One of the wells shall be located downgradient of the former tank pit. A hydropunch may be <br /> used to assist in determining well locations. If the r suit of laboratory analysis of the initial <br /> sampling is non detect and it can be demonstrated that there is no contamination in any of the <br /> wells for two consecutive quarters then a closure report may be submitted. <br /> Laboratory analysis of soil samples shall be by EPA thod 8020 for Benzene, Toluene, Ethyl <br /> Benzene and Xylene (BTEX) and EPA method 8015 for Total Petroleum Hydrocarbons as Diesel <br /> (TPH-d). Laboratory analysis of water samples shall tie by EPA method 602 for BTEX and an <br /> EPA 3510 extraction analyzed by Gas Chromatography using a Flame Ionization Detector <br /> (GCFID) for TPH-d. Detection limits for Kerosene a id Diesel shall be 50 ppb. <br /> A Division of San Joaquin Counts Hea th Care Services <br />