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A RESNA Company `-_--1MR <br /> Environmental Solutions <br /> Through Applied Science, <br /> 3164 Gold Camp Drive, Suite 200 Engineering&Construction <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 852-6690 <br /> FAX (916) 852-6688L;L <br /> , ; <br /> E�s 4 <br /> W j tSl � <br /> AR 2 4 1992 <br /> ENViROWENI <br /> E'ER !T/SERV1CMnuary 27, 1992 <br /> Mr. Gary Brophy <br /> 1235 Slayton Drive <br /> Manteca, California 95336 <br /> Subject: Ground-Water Monitoring, Fourth uarter 1991, at Former Texaco Service <br /> Station, 941 East Yosemite Avenue Manteca, California. <br /> Mr. Brophy: <br /> At your request, RESNA Industries (RESNA, formerly Applied GeoSystems) conducted the <br /> fourth quarter 1991 ground-water monitoring eve t at the former Texaco Service Station in <br /> Manteca, California. The site is approximately 3,500 feet west of Highway 99, as shown on <br /> ., the Site Vicinity Map (Plate 1). The purpose of this monitoring event was to verify that <br /> concentrations of hydrocarbons remain below M 'mum Contaminant Levels established by <br /> the California Department of Health Services. The work for this monitoring event included <br /> measuring depths to ground water and subjectively analyzing ground water in monitoring <br /> wells MW-1 through MW-3, purging and sampling ground water from these monitoring <br /> wells,analyzing the ground-water samples for hydrocarbons, and evaluating the ground-water <br /> flow direction and gradient beneath the site. Mo 'toring-well locations in relation to other <br /> former site features are shown on the Generalized Site Plan (Plate 2). <br /> BACKGROUND <br /> Hydrocarbons were detected in soil and ground water at the site during previous <br /> investigations by Canonie Environmental Se ices of Stockton, California (Canonie <br /> Environmental Services, March 1 and 29, 1988, Report No.s 85-052-3580 and 3776). <br /> In October 1988, Applied GeoSystems observed the drilling of three soil borings and the <br /> construction of three monitoring wells at the site. Hydrocarbons were detected by <br /> laboratory analyses in soil and ground-water samples collected during this investigation. On <br /> the basis of the results of this investigation, we recommended (1) excavation of soil <br /> containing hydrocarbons to remove the source for future migration of hydrocarbons into <br /> - ground water and (2) 1 year of quarterly ground-water monitoring to evaluate the <br /> 1231gbro <br /> 38053-4 <br />