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Wright <br /> -� Environmental <br /> Services, Inc. <br /> Construction ♦ Engineering ♦ Remediation <br /> April 10, 1998 <br /> City of Tracy <br /> Attn: Paul Verma <br /> 520 Tracy Boulevard <br /> Tracy, CA 95376 <br /> Re: Site Problem Assessment <br /> Delta Disposal-99 Sixth Street,Tracy, CA <br /> Wright Project No.4509-T, PHS-EHD Site Code 2183 <br /> Dear Mr. Verma, <br /> At your request, Wright Environmental Services, Inc. (Wright) has prepared the workplan for assessing <br /> the contamination at the above referenced site. As you know, the San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS-EHD) has requested that further work be done to <br /> ascertain the presence and extent of contamination from the former underground storage tanks. <br /> Background <br /> One underground storage tank reported to be 500 gallons and last containing gasoline was removed in <br /> 1990 during realignment of Sixth Street in front of the Tracy Delta Disposal, located at 99 West Sixth <br /> Street. The tank was located under the sidewalk adjacent to the former Sixth Street alignment. Soil <br /> samples showed Petroleum Hydrocarbons as Gasoline (TPHG) and Low levels of Toluene, <br /> Ethylbenzene and Xylenes. <br /> Technical Approach <br /> The technical approach to this project is to conduct a horizontal and vertical investigation of the site and <br /> vicinity. The area is somewhat constricted due to the proximity of the street and buildings, so a phased <br /> approach is proposed. Consistent with the City of Tracy requirements, a traffic control plan will be <br /> developed since some of the work will occur in the street. Soil borings and reconnaissance soil and <br /> groundwater sampling will be done at the_locations shown on Figur�l_ This should provide an <br /> assessment of the approximate contaminant extent in groundwater. The data collected in these borings <br /> will be used to select locations for permanent groundwater monitoring wells. This should allow the <br /> dissolved plume to be located and monitored, and cleanup approaches to be evaluated. <br /> Field Activities and Methods <br /> Exploratory Soil Borings for Reconnaissance Sampling <br /> The exploratory borings will be advanced to the uppermost groundwater bearing strata to collect soil <br /> samples, depth to water measurements, and collect reconnaissance groundwater samples. The <br /> boreholes will be temporarily cased and developed, and covered for about 24 hours. The ground water <br /> samples collected from the boreholes will be used forarapid reconnaissance of the site groundwater <br /> contamination. All sampling, drilling, sealing and well construction will follow th Geoscience Protocols <br /> (Attachment C) of Wright. <br /> 4220 Commercial Dr., Suite 5 • Tracy,CA 95376 <br /> 209.833.0758 • Fax 209.832.5152 <br /> wright@inreach.com Lic. #651501 A-B HaWat g�� <br />