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ENVIROGoM EnviroCom C o n{s ru ! aln ';`Inc. Ca Ikdnn-Endwm..LiL9f11 Nance "04 J-;!I 18 Pik Z: 46 January 12 , 1994 Elizabeth Thayer Central Valley Regional Water Control Board 3443 Routier Road Sacramento CA 95827-3098 RE: TOYOTA TOWN, 2150 E. Hammer, Stockton CA 95210-0368 SITE CODE 1128 Dear Ms. Thayer, You have requested that our client, Toyota Town, test the area around the used oil drain pipes in the shop to ensure that used oil has not leaked from the pipes which were connected to an underground tank which has subsequently been removed. You have requested that Toyota Town create five (5) exploratory borings to make this determination. We propose the following: According to Toyota Town management, the used oil supply pipe was placed in the soil approximately twelve ( 12 ) inches below the concrete surface of the shop. There are two supply pipes, one on the west side of the shop and one in the center of the shop which move downgrade from north to south where they were previously connected in a T-coupling to the tank. The pipes have subsequently been filled and sealed with concrete. Two (2) borings will be accomplished on the west ]side which was least used and three (3) borings will be accomplished in the center of the shop. The borings will be accomplished at a depth of two (2) feet, that is one (1) foot under the pipe. The bor- ings will be placed four (4) inches from the pipe. A concrete saw will be used to remove the concrete cap and a hand auger will be used to remove the sample. Your presence is requested at the time the samples are removed. The samples will be placed in sterile containers with zero head space and transported with a Certificate of Custody to a Califor- nia State registered laboratory where a BTEX test will be per- formed to determine if the soil contains any used oil constitu- ents. 4175 E. La Palma Avenue, Suite 260 Anaheim, California 92807 007,16 714-996-9956 Fax 714-996-9959