ITEM: 5.C

Page 2

STATE OF CALIFORNIA

CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD

SAN FRANCISCO BAY REGION

STAFF SUMMARY REPORT (George Lincoln)

MEETING DATE: April 18, 2001

ITEM: 5.E

SUBJECT: XIDEX CORPORATION AND MR. JOHN ZIEGLER, 305 SOQUEL WAY, SUNNYVALE, SANTA CLARA COUNTY – Rescission of Site Cleanup Requirements

CHRONOLOGY: April 15, 1987 - Site Cleanup Requirements Adopted

DISCUSSION: The Board issued Site Cleanup Requirements to Xidex Corporation and Mr. John Ziegler, property owner, in 1987. The Order addressed an underground storage tank farm and manufacturing/office building facilities then in operation. Xidex, now known as its successor Anacomp Inc., manufactured microfilm at the 305 Soquel Way property. Anacomp terminated all business-related activities and vacated the property before the end of 1994.

During the early 1970s, four underground storage tanks containing virgin organic chemicals used in the manufacturing process were installed at the property. Chemicals were first discovered in the groundwater beneath the site in 1983. Samples from monitoring wells installed downgradient of the tanks revealed that organic chemicals were present in the shallow groundwater.

From August 1987 until the end of 1992, a groundwater extraction and treatment system operated at the site. The groundwater extraction and treatment system and natural attenuation has reduced groundwater pollution to asymptotic levels. In addition, source area soils have been excavated to eliminate sources of further contamination. Monitoring from 1987 to the present has shown that concentrations of chemicals of concern are now below applicable maximum contaminant levels (MCLs) and levels that would constitute acceptable risk. Given this there is no need for further remedial actions or groundwater monitoring.

The Tentative Order (Appendix A) addresses site investigation and remediation, the basis for rescission, and rescinds existing Site Cleanup Requirements.

RECOMMEN-

DATION: Adoption of the Tentative Order

File No. 43S0147 (GAL)

2189.8080 (GAL)

Appendix A – Tentative Order