SITE INFORMATION AND CORRESPONDENCE

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I STAT�s� E tµR OF CALIFORNIA lr- CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— DEC 7 W9, CENTRAL VALLEY REGION 1 -e 3443 ROUTIER ROAD ENVIRONMENTAL tIIeALTH SACRAMENTO, CA 95827-3098 - `PERMIT/SERVICES 4 April 1989 Mr. John DeSelm COPY Anheuser Busch Companies _ One Busch Place St. Louis, MO 63118 PROBLEM.ASSESSMENT WORK PLAN FOR RAINBO BAKERY, 2651•SOUTH!AIRPORT WAY,`-=• STOCKTON, SAN JOAQUIN COUNTY Thank you for submitting the 19 September 1988 wo-k plan for our review. We have discussed the work plan with the San Joaquin Local Health District (SJLHD) and we agree it is acceptable, but the following additional information is to be furnished prior to conducting the work: 1. Supply copies of the laboratory reports for soil and ground water samples collected when work outlined in the 19 January 1988 work plan was conducted. 2. Supply a table of the ground water level measurements made at the site. In addition, on the site map in the work plan the ground water gradient direction dated 10/14/88 should probably be dated 10/14/87. 3. Provide a well construction diagram for the proposed monitoring wells which includes specific information, such as the thickness of the bentonite seal, grout seal, sand pack, etc. 4. Submit a Health and Safety Plan, as required by the SJLHD. This information is be submitted to us and the SJLHD in an Addendum to the 19 September 1988 work plan before permits to conduct the work will be issued. All' necessary permits to conduct this worK are'to be obtaine& from the appropriate local agencies. We have the following comments and recommendations which are to be addressed when the proposed work is conducted: 1. Water samples are to be collected from all the monitoring wells (including monitoring wells MW#2 and MW#3) for BTX&E and TPH analyses. 2. The continuously cored boreholes are to be sampled for laboratory analysis every 5 -foot interval or change in lithology using a 1.5 -foot - long split -spoon sampler. These undisturbed soil samples are to be collected after each 5 -feet of continuous core has been retrieved. We do not recommend collecting and transferring soil samples to glass jars for laboratory analysis from the continuous core, as proposed in the work plan, because the soil will be agitated and volatile hydrocarbons lost. 3. All ground water and soil sample data are to be presented in tables within the text of the Problem Assessment Report (PAR).