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Wm. J. Hunter & Associates 2220 Loma Vista Dr <br /> Registered Geologists Sacramento, CA 95825 <br /> �etroleum& Mineral Appraisers (916) 972-7941 <br /> FAX (916) 972-1683 <br /> INTERIM ASSESSMENT REPORT <br /> AND WORKPLAN FOR <br /> GROUNDWATER INVESTIGATION <br /> RIVERSIDE CEMENT COMPANY <br /> 2825 W. Washangton Blvd, (Site Code 2588) <br /> Stockton, CA <br /> October, 1994 <br /> PURPOSE OF WPM: <br /> On November 2, 1992, a 1,000 gallon UST which had contained <br /> gasoline was removed from the site. Although soil samples taken <br /> from beneath the tank did not reveal any contamination, a small <br /> area at the north end of the excavation had a petroleum order and <br /> apparent discoloration. The site was reentered on November 25, <br /> 1993, and again on April 6, 1993, and additional spoil was <br /> removed & soil samples were taken. A "grab" sample of ground- <br /> water was taken during the April work. All samples were below <br /> detection limits for BTEX & TPH-G, and site closure was <br /> recommended. Refer to EXHIBIT B for a copy of that report, (w/o <br /> attachments. ) <br />• Although the San Joaquin County EHD agreed that the contaminated <br /> spoil had been removed, they did not consider the water sample as <br /> being representative of aquifer conditions due to being exposed <br /> to air. After meeting with the County staff, it was agreed that <br /> one (1) monitoring well located at the site of the removed UST <br /> would be sufficient for determining whether the groundwater has <br /> been contaminated. This workplan has been prepared to complete <br /> that task. <br /> PROP TY LOgATIOIN AND USE. <br /> The property is located in the Port of Stockton, at the west end <br /> of Washington Blvd near its' juncture with Navy Drive_ Rough and <br /> Ready Island is less than 1/2 mile to the west, and the Stockton <br /> deepwater channel is a short distance to the north_ The site <br /> consists of approximately five acres, and is used to store dry <br /> cement and fly ash for distribution to concrete batch plants. A <br /> warehouse, four vertical silos and a truck scale are located on <br /> the site_ <br /> PROPERTY OWNER & RESPON IB PARTY: <br /> Riverside Cement Company, Environmental Office, 1490 Rubxdoux <br /> Blvd, (P.O. Box 56040) Riverside, CA 92517- Attn Eugene Kulesza, <br /> Manager of Regulatory Affairs <br /> 1 <br />