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�^ �.� 7 ii'�1°� �-,Y�.:� � •�4ma i� „�x..y��ya"+ �- -°- }.4� r�i i'= r LIMA=� � ' 'i•� c "" 'i�s;.+'�.�}5z .s.,j: ww .4 7 [` <�t4. p.ff;3 i14 �rro� ,f. ,a °� _-s•.n a •r' r RE TE PROJECT REGAL 603 2-10-89 C. CHEMICAL RESUL IS ACTS collected sic soil samples (one from each end of the three removeed underground storage wnks: S-17-T1, S-17-T2,S-17-T3, S-17-T4, and S-18 T6)at approximately 17 feet below the surface on October 21, 1988. These samples were immediately placed on ice and chain of custody delivered to Moble Chem Labs Inc. (MCLI)on October 24, 1988 for 24 hour turn around and analysis for Total Petroleum Hydrocarbons (TPH)and Aromatic Volatile Organics (BTF—X). Duplicate samples of S-17-12 and S-1745 were collected during this time,preserved and chain of custody delivered to Sequoia Analytical on October 27, 1988 for 48 hour turn around and analysis for Organic Lead and Ethylene Dibromide using CA LUFr 12187 manual methods. AGS collected two soil samples,one from the west side wall and one from the:north side wall (S-16-NW and S-16-WW)at approximately 16 feet below the surface on October 25, 19821. These samples were immediately ice and chain of custody delivered to MCLI on October 26, 1988 for 48 hour turn around analysis for TPH and BTX. On October 25, 1988 AGS collected five soil samples from the base of the deepened excavation at approximately 28 feet below the surface (S-27-A, S-28-B, S-217-C, S-28-D and S-28-E). These samples were immediately iced and chain of custody delivered to MCLI on October 26, 1988 for 12 hour rush;turn around analysis for TPH and BTX. Also on this day Applied Geos;,.;terns collected 13 soil samples fmm the excavated soil (S-1025-A thru M). These samples were immediately placed on ice and chain of custody delivered to MCLI on October 26, 1988 for 12 hour turn around analysis for TPH and BTEX. MCLI used EPA methods 5020 (for extraction),8015 for Total Petroleum Hydn-icarbons (TPH),and 8020 for Aromatic Volatile Organics ( aTF) The TPH and BTEX coneenttatiotrs for samples collected by reported in parts per million (ppm)and can be found on Table 1.The lower detection limit for TPH was 1.0 ppm and for BTX was 0.1 ppm. Western Geo-Engineers collected 24 sol samples from six exploratory borings situated around the tank excavation and a ground water samples from all but soil boring 6,as floating product was encountered in that boring and no water sample was obtained. The soil samples were immediately preserved on dry ice and and the water samples were immediately preserve on ice and then chain of custody hand delivered to McLaren Laboratories for 48 hour turn around analysis of TPH, ;TEX and Total Lead. McLa=use EPA method 3550 for extraction, modified 16,