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�r Advanced =:o= GeoEnvironmentall Inc . o f Northern Cali fof-nia F O B°lyeberyF�T q�, 10 April 1997 p p'br°8B AGE-NC Project No. 97-0301 �, c°hoitgLe� c °�'cFC oy��Li ate ,OnS �9S�oros/�� Mr. Steve Sasson 38 SAN JOAQUIN COUNTY PHS-EH---D. 8 304 East Weber Avenue by Stockton, CA 95201-0388 Subject: Addendum to Work Plan, dated 18 February 1997 PACiFZC PRIDE - ELDORADO 3147 Street El Dorado Street, Stockton, California Dear Mr. Sasson: As discussed in our meeting on 7 April 1997 regarding the Work Plan Addendum for the above referenced site, six soil probe borings will be needed as part of preliminary site assessment. Soil probe boring locations are depicted with the enclosed Figure 1 - Site Plan. Furthermore, the following revisions are an addendum to the work plan dated 18 February 1997. • A total of two soil probe borings will be advanced at an approximate 30° angle (Figure 2) beneath the northern and southern underground storage tanks (USTs). Soil samples will be collected at approximately 20 feet below site grade and analyzed for total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d), volatile aromatics (benzene, toluene, ethylbenzene and xylenes: BTEX) and methyl tertiary butyl ether (MTBE) in accordance with proper EPA methods. • A total of two soil probe borings will be advanced at each end of the "middle UST"at an approximate 30° angle (Figure 3). Soil samples will be collected at approximately 20 feet below site grade and analyzed for TPH-g and TPH-d, BTEX and MTBE in accordance with proper EPA methods. • A total of two vertical soil probe borings will be advanced near the west and east dispenser islands. Soil samples will be collected at approximately 10 feet below site grade and analyzed for TPH-g and TPH-d, BTEX and MTBE in accordance with proper EPA methods. 1803 West March Lane,Suite A,Stockton,California 95207 Telephone(209)95670264 ".',FAX(209)956.-10700.