SITE HISTORY - Laserfiche WebLink

Home Browse Search

' � • MEMORANDUM • CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION 3443 Routier Road Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS: 8-495-5600 TO: GARY REENTS FROM: TWILA LECLERC Senior Engine r Area Engineer DATE: 19 May 1989 SIGNATURE: 1 � � P filf�j SUBJECT: Southern Pacific Pipe Lines (SPPL) report I have reviewed the report, "Ground-Water Investigation and Environmental Assessment, Stockton Terminal, " prepared by Hydro- Search, Inc. for SPPL, dated 28 April 1989 . This report characterized the regional and SPPL site-specific geologic and hydrogeologic conditions; discussed the soil borings, monitoring well construction and development, and soil and ground water sampling; and presented the lab results. The ground water analyses showed high contamination at MW-1: 58 . 4 ppm total petroleum hydrocarbons (TPH) ; 14, 000 ppb benzene; 10, 000 ppb toluene; 1500 ppb ethylbenzene; and 7300 ppb xylenes. MW-2, MW- 3 , and MW-4 had much lower levels of contamination: 0-4 . 8 ppm TPH; 1. 7-2 . 4 ppb benzene; 0-4 .8 ppb toluene; 2 . 8 ppb 1, 4-dichlorobenzene; and 1. 7 ppb chlorobenzene. It should be noted that the results on page 2 of the report are incorrect, compared to Table 6 (p. 32) and the Enseco lab results in Appendix B. The ground water sample from MW-4 contained 0.7 ppb toluene and 2 . 4 ppb benzene, not 2 . 4 ppb toluene and no benzene. The soil analyses showed 830 ppm TPH at MW- 1 and 1300 ppm of unidentified hydrocarbons (C9-C16 range) at MW-3 . SPPL claims they are not the source of this contamination and that it has come from an up-gradient source off-site. This may be true for MW-2 , MW-3 , and MW-4 . However, KW-1 does not appear to be directly downgradient of anything except for SPPL facilities and Navy Drive. In addition, the soil contamination at MW-1 indicates a spill in its immediate vicinity and not ground water migration. This is also the monitoring well with the highest ground water contamination, another potential indicator of a spill. The 1300 ppm unidentified mixture of hydrocarbons in the soil sample at MW-3 indicates a spill of something, maybe from SPPL' s storage tanks directly downgradient. Additionally, SPPL had their pipelines near Time Oil and Tesoro tested for leaks in March 1988. The tests showed no leaks. The Levine-Fricke report, "Investigation of Subsurface Fuel Hydrocarbons, SPPL, " dated 23 March 1988 , emphasized that the floating product in the test area was not JP-4 . I agree. However, the fingerprint characterizations (gas chromatograms) in the report showed the