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s - January 4, 1993 rr � <br /> Page 3 <br /> detectable quantities of pollutant metals, and a variety of volatile- to semi- and <br /> non-volatile organic compounds. Separate-phase petroleum hydrocarbons have <br /> also been observed, at thicknesses exceeding 0.1 foot. The extent of groundwater <br /> impact from the SP facility is not considered delineated at this time. <br /> f CONCLUSIONS <br /> 'Due to the proximity of the SP and GWSP sites to Unocal Bulk Plant 0788, the <br /> prevailing groundwater flow directions, and the lack of delineation of dissolved <br /> petroleum hydrocarbons underlying these sites, PACIFIC recommends continued <br /> monitoring of the progress of the investigations at the SP and GWSP facilities. <br /> PACIFIC further recommends that additional off-site investigation at the Unocal <br /> facility be contingent upon the cooperation of the other potentially responsible <br /> parties, SP and GWSP. <br /> If you have any questions regarding this letter, please do not hesitate to call. <br /> Sincerely, <br /> Pacific Environmental Group, Inc. <br /> B dwin <br /> Project Geologist 'c��`�D GE��0C <br /> JOHN MARK '1 <br /> INGLIS <br /> Mark Inglis lip No.5056 <br /> Senior Hydrogeologist �yj <br /> RG 5056 FOP CALNFr <br /> Attachments: Figure 1 - Site Location Map <br /> cc: Ms. Mary Meays, San Joaquin County Public Health Services <br /> Mr. James B. Maughan, Central Valley Regional Water Quality <br /> Control Board <br /> 3100103/FILEREV <br />