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Civic Center Square • 2444 Main Street, Suite 215 Fresno, California 93721-2734 (559) 264-2535 • FAX(559) 264-7431 GEOMATRIX October 4, 2002 Project 8324.000.0 04 OCT - 4H 8: 09 Mr. Harlin Knoll San Joaquin County Environmental Health Division 304 E. Weber Avenue, Third Floor Stockton, California 95202 Subject: Soil Boring Permit Application Port of Stockton Roberts Island, California Dear Mr. Knoll: Per our discussion this morning, this letter describes the activities related to the soil boring application sent to the San Joaquin County Environmental Health Division (SJCEHD) on behalf of the Port of Stockton (Port). Last year, the Port performed maintenance dredging activities along the docks at the Port's west complex. The dredged materials were transported to a dredge placement site (DPS) on Roberts Island. Prior to implementing the dredging, the Port conducted an investigation of the background soil and groundwater quality in the DPS in support of a negative declaration under CEQA and to collect data for a report of waste discharge (ROWD) to the California Regional Water Quality Control Board-Central Valley Region (RWQCB). Four monitoring wells and five soil borings were installed in February 2001 under permit from the SJCEHD. Although no formal report was submitted regarding the results of DPS assessment, the data were submitted to the RWQCB and included in the CEQA document, and Waste Discharge Requirements (WDRs) were issued to the Port for the dredging activities. The Port is planning to expand maintenance dredging activities along the docks at their west complex. Because this is a maintenance dredging operation, the dredging activities fall under a general dredging permit and the United States Army Corps of Engineers have no other involvement in it. The dredged materials will be transported to the same DPS site. Because the expanded dredging will exhume more material than last year's dredging, additional soil samples will be taken northwest of last year's soil and groundwater sampling in an area known as the "decant water overflow area." Five soil borings are proposed for this area, again in support of a negative declaration for CEQA and to collect data for a ROWD. This work is self-directed, as the Port is the lead agency on the CEQA project. We have enclosed a work plan for the soil borings, including a map showing the approximate location of the borings. All findings will be submitted to and reviewed by the RWQCB, and WDRs must be issued before the dredging can take place. Sue McConnell is the senior staff member for the RWQCB on this project. Geomatrix Consultants, Inc. Engineers, Geologists, and Environmental Scientists