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LIKA CORPORATION - FIELD AVENUE SITE EXECUTIVE SUMMARY Consistency with Applicable Regulations This Final RAP for the LIKA-Field site (LIKA/Field) meets the requirements of the California Health and Safety Code Section 25356. 1 (c) , and (d) , and is consistent with the National Contingency Plan (40 CFR Part 300 et sec ) . Site Description and Preliminary Investigation The LIKA Corporation, Field Avenue site is located in the City of Stockton, San Joaquin County at 1856 Field Avenue. The site lies adjacent to the Stockton Turning Basin. The property and 14 , 000 square-foot building were leased from Blatt Corporation for the etching and plating of electronic circuit boards. Etching and plating of printed circuit boards began in August 1982 and was discontinued in April 1985 . Chemicals used in the etching and plating process spilled onto the floor in the process "wet room" and drained to the outside of the building, contaminating a narrow strip of pavement and soil on the adjoining property. These same chemicals also leaked through the "wet room" sump liner and wall and contaminated subsurface soils underneath the building floor, and shallow groundwater surrounding the sump. The situation came to the attention of the Department of Health Services (DHS) in September 1984 through a citizen's complaint forwarded from the San Joaquin Local Health District. soil samples of the narrow strip outside of the western wall of the "wet room" were taken by DHS during an inspection in November 1984 . Sample results revealed maximum concentrations of 16, 500 ppm (parts per million) copper and 893 ppm lead. Remedial Investigation and Interim Remedial Measure Investigation and remediation of the Field Avenue site by LIKA Corporation began with soil boring and monitoring well installation. The Department monitored field work by LIKA. Soil borings were taken outside of the exterior wet room wall and through the concrete floor of the wet room. A total of 12 monitoring wells were established both inside and outside the building in the upgradient, downgradient, and crossgradient directions. Wells were screened in the shallow groundwater unit. Water quality and soil samples were collected for chemical analysis. Results indicated soil contamination outside the building by copper (3370 mg/kg, max) and lead (138 mg/kg, max) . Shallow groundwater under the floor of the building near the sump contained elevated levels of lead (0. 14 mg/L, max) 1 and copper (9 . 90 mg/L, max) 2 . Shallow groundwater outside but near the building contained elevated levels of lead (0. 11 mg/L, max) . State drinking water standard for lead is 0. 05 mg/L (Title 22 California Code of Regulations, Sec. 64435) 2 The federal secondary drinking water standard for copper is 1. 0 mg/L.