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Date: November 12, 1997 File#: 562.1-97.155 <br /> To: GAS SYSTEM TECHNICAL SUPPORT <br /> From: TECHNICAL AND ECOLOGICAL SERVICES <br /> Subject: Tracy-Line 107 Rupture <br /> � . <br /> JANET OLIVER: <br /> The Technical and Ecological Services- Environmental Chemistry Unit was requested to take <br /> confirmation samples following clean up of contaminated soil from the ruptured line 107 on <br /> September 18, 1997. A liquid sample was also collected and analyzed by TES for mercury, <br /> glycols, chlorides, sulfate, and thiosulfate. Samples were sent to Chromalab Inc. in Pleasanton <br /> and analyzed for Total Petroleum Hydrocarbon as Gasoline and BTEX compounds <br /> (EPA Method 5030/8015M/8020),Total Extractable Petroleum Hydrocarbons <br /> (EPA Method 3550/8015M), Polychlorinated Biphenyls(PG&E PROC#6.5),and mercury <br /> (EPA Method 3010A/3050A/6010A/7470A/7471A). <br /> FIELD SAMPLING <br /> September 18, 1997 <br /> Seven confirmation surface samples were taken following clean up of the contaminated soil in an <br /> area 60 feet by 250 feet from the ruptured line 107 (reference attached drawing). Additionally, <br /> five samples from the stockpiled soil were also taken. Sampling area and locations were <br /> determined by Mr. Harlin Knoll from the San Joaquin County Public Health Services Department. <br /> TES was in concurrence with these locations. If the stockpile soil showed concentrations of either <br /> Mercury or PCB then the seven confirmation surface samples would be analyzed for one or both of <br /> these analytes. <br /> The samples were taken using a soil sampler with 2 inch by 4 inch brass tubes. Both ends of the <br /> brass tubes were covered with teflon tape and sealed with plastic end caps. The sample holder was <br /> cleaned with TSP(Trisodium Phosphate)and rinsed with deionized water after each sampling <br /> location. Samples were labeled, placed in an ice chest,and transported to Chromalab, Inc. <br /> accompanied with a Chain-of-Custody form. <br /> A liquid sample of the pipeline liquid was taken from a collection drum used to contain the <br /> ruptured line fluid. Sample was labeled,placed in an ice chest,and transported to TES for <br /> analysis. <br /> October 3, 1997 <br /> As a result of Mercury being present in the confirmation samples,three additional background soil <br /> samples were taken south of the spill area, see attached drawing. Samples were taken following <br /> the same sampling protocol as on September 18th. Samples were labeled,preserved, and <br /> transported to Chromalab accompanied with a Chain-of-Custody form. <br /> TES 24-Hour Service Line: 8-251-3197 or(510)866-3197 <br />