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AL c SMTHlic ENVIRONMENTALTECHNOLOGIES CORPGRATION P M 12: 2 7 April 9, 1997 97715 Mr. Harlin Knoll San Joaquin County Public Health Services Environmental Health Division 304 E. Weber Street, 3rd Floor Stockton, California 95202 Subject: Summary Report for Phase II Environmental Site Investigation at Proposed Taft Detention Basin, 3707 S. EI Dorado Street, Stockton, California Dear Mr. Knoll: Smith Technology Corporation, on behalf of the City of Stockton Department of Public Works (DPW), has prepared this document to serve as a summary report for a site investigation at the above referenced site (Figure 1). The DPW requested this investigation as part of a property transfer. The DPW obtained a Right of Entry from the property owner, William Scott of Scott Properties (see attachment) to conduct the investigation. The purpose of the site investigation is to evaluate potential environmental concerns at the proposed location of the Taft storm basin. According to the DPW, the site has historically been vacant. Thus, the most likely source of any potential adverse soil impaction at the site is from on-site surface spills or dumping. Advance Four Soil Borings, Soil Sample Collection and Analysis On February 28, 1997, a Smith Technology geologist supervised the advancement of four soil borings to depths of approximately 20 feet below ground surface (bgs) on-site. A site plan with boring locations is shown on Figure 2. Fisch Environmental, under subcontract to V & W Drilling, Inc. of Rio Vista, California (C57 license #720904) advanced the borings using truck mounted Geoprobe® narrow diameter, direct push technology. All field activities were conducted in accordance with Smith Technology's Workplan for Phase H Environmental Site Investigation at Proposed Taft Detention Basin, 3707 S. El Dorado Street, Stockton, California, submitted to the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) on February 19, 1997. Soil samples were described according to the Unified Soil Classification System. Descriptions of soil types encountered and sample collection intervals are presented on boring logs in Attachment I. Soil samples were collected at three feet bgs and at five-foot intervals. Each soil sample was field screened with a Photoionization Detector (PID) for w:\97715Meportsvtrtpt.doc 1260 Graphics Drive Modesto,CA 95351-150 (209)579-2221 Fax(209)579-2225 Engineering • Consulting • Remediation • Construction