WAREHOUSE (T0608500710) - (MAP)

560 NORTH 6TH STREET
SAN JOSE, CA  95112
SANTA CLARA COUNTY
LUST CLEANUP SITE  
PRINTABLE CASE SUMMARY / CSM REPORT
CLEANUP OVERSIGHT AGENCIES
SANTA CLARA COUNTY LOP(LEAD) - CASE #: 07S1E05N01f
      CASEWORKER: Gerald O'Regan
SAN FRANCISCO BAY RWQCB (REGION 2) - CASE #: 14-123
      CASEWORKER: Regional Water Board
CUF Claim #:    10757
CUF Priority Assigned: C
CUF Amount Paid:    $1,418,270

Regulatory Profile

CLEANUP STATUS - DEFINITIONS
OPEN - SITE ASSESSMENT AS OF 12/31/2004   - CLEANUP STATUS HISTORY
POTENTIAL CONTAMINANTS OF CONCERN
BENZENE, DIESEL, GASOLINE, MTBE / TBA / OTHER FUEL OXYGENATES, TOLUENE, XYLENE 
POTENTIAL MEDIA OF CONCERN
OTHER GROUNDWATER (USES OTHER THAN DRINKING WATER), SOIL, SOIL VAPOR, UNDER INVESTIGATION 
FILE LOCATION
ALL FILES ARE ON GEOTRACKER OR IN THE LOCAL AGENCY DATABASE 
USER DEFINED BENEFICIAL USE
GW - MUNICIPAL AND DOMESTIC SUPPLY 
DESIGNATED BENEFICIAL USE(S) - DEFINITIONS
MUN, AGR, IND, PROC
DWR GROUNDWATER SUB-BASIN NAME
Santa Clara Valley - Santa Clara (2-9.02) 
CALWATER WATERSHED NAME
Santa Clara - Coyote Creek (205.30) 
GROUNDWATER MONITORING FREQUENCY
# OF WELLS MONITORED - QUARTERLY : 5
REASONS FOR QUARTERLY OR MONTHLY OR OTHER GROUNDWATER MONITORING:
  • Well Being Sampled During Remedial Action for Progress Assessment - A vapor extraction system restarted during 2Q 2009. The purpose of the remediation system is to reduce soil and groundwater concentrations which pose a potential vapor intrusion threat to apartment residents. Well sampling data is used to measure effectiveness of remediation system.
  • Site History
    In 1988, one gasoline and two diesel underground storage tanks (UST) were removed from the southern portion of the site. Total petroleum hydrocarbons in the gasoline range (TOP-g) were detected in soil and groundwater near the location of the USTs. In 1997, four more USTs were removed from the site. Free product was found near one of these USTs, a 20,000 gallon redwood UST located in the northeastern part of the site that formerly contained bunker C fuel. Low levels of TPH-g and gasoline-related compounds including benzene, toluene, ethylbenzene, and xylenes (BTEX) were detected in groundwater near two of the three other USTs which had stored gasoline.

    A groundwater extraction and treatment system was implemented in 1991 to treat the groundwater contamination from the original gasoline USTs which had been removed in 1988. This system, consisting of two to three extraction wells, was operated for several years. In 1998, four dual-phase (groundwater and soil gas) extraction wells were installed. Dual-phase extraction from these four wells was continued from 1999 to 2003, when the system was shut down with approval from the Santa Clara Valley Water District (SCVWD). Ongoing quarterly groundwater monitoring indicated that chemical concentrations were rebounding by January 2005.

    Construction of the Miraido Apartment complex was completed in 1997 and occupied in 1998. The complex includes three apartment buildings, a community meeting room and pool area. The apartment buildings are referred to as building 520 which is a two story structure, and buildings 540 and 560 which are mostly three story structures with second story lofts on the third floor. Building 560 has commercial retail space on the bottom floor.

    Soil vapor, sub-slab soil vapor, indoor air, and outdoor air samples have been collected and analyzed. The most recent investigation which consisted of collecting indoor air, sub-slab soil vapor and background outdoor air samples is currently under review. The investigation will present the analytical results, findings, conclusions and recommended actions.