California Air Resources Board
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Updated September 05, 2000

Site Photographs


Site Location


sj4_roo1.jpg (59756 bytes) sj4_roo2.jpg (59360 bytes) sj4_roo3.jpg (57204 bytes) sj4_roo4.jpg (58772 bytes)

N 37°20’24.2” and W121°53’19.5”.

UTM Zone 10: 598.437 km Easting,

4132.972 km Northing.

Views of Interior of Site

Site Description

The SJ4 site is located in a strip mall located at 120 N 4th Street, San Jose, California.  The nearest intersection is 4th and St. Johns.  Local emission sources include residential and vehicular.  There appear to be no industrial emissions within a ¼ mile radius of the monitoring station.  The site appears to be secure with ample parking within the strip mall parking lot.

The monitoring station is an environmentally controlled four-room office, with monitoring instrumentation in the front and middle rooms, as shown in above photographs.  Access to the roof is accomplished using a ladder within the interior of the office.

Review of the space and power availability of SJ4 revealed sufficient space to deploy, install, operate and calibrate the proposed CRPAQS monitoring equipment in the front room and on the roof.  Mr. Yamaichi could organize and consolidate the majority of the hardware, currently occupying the front room, to accommodate the addition of the CRPAQS instrumentation.  Photographs P6150003 and P6150004 document the counter space, 10’ x 21”-24”, available at the west side wall of the front room.  If any of the instruments require a straight run to the roof, there is a hole in northwest corner ceiling that would provide this straight run.  It is recommended that a rack or shelves be installed in/on the NW corner to provide additional counter space.

The middle room has rack space and power to accommodate the three continuous satellite instruments, using a TEI 42 as an estimating guide.  However, it is recommended by AVES to use the front room only.  This separation of CRPAQS and BAAQMD operations is recommended to avoid any potential problems in logistics, operations, and communications between the BAAQMD and CRPAQS contracted personnel.  

The roof of the monitoring station is flat and has sufficient space and power (seven 20-amp circuits) to accommodate the instruments to be installed on the roof during the program.  Mr. Yamaichi requested that the “front room” continuous instruments’ sample pumps be installed on the roof, to minimize the noise and heat produced within the station.  There appears to be sufficient power and sheltered space on the roof to satisfy this request.

Installation of the monitoring equipment in the front room of the monitoring station would require a modification to the current power source.  It is recommended that CRPAQS install all the power, including separate breakers per instrument, if deemed necessary, in the front room to accommodate each instrument’s power requirements.  The sampling equipment would also require sampling lines, manifolds, calibration equipment and standards.  Additional telephone lines should be installed by CRPAQS.  Air conditioning does not appear to be a problem at the site, but the front room’s temperature should be monitored during the first couple of weeks of operation to verify this assumption.



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A department of the California Environmental Protection Agency