CC 12-05-23 Item No. 13 Update regarding Vallco's SB 35 projrct approval_Written CommunicationsCC 12-05-2023
Written Communications
Item No. 13
Update regarding
Vallco's SB 35 project
approval
From:Kitty Moore
To:Pamela Wu; City Clerk; Kirsten Squarcia
Cc:Matt Morley
Subject:December 5 Item 13 Staff Questions and Written Communications
Date:Monday, December 4, 2023 10:00:07 AM
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Hi,
Thank you for the report on Item 13.
The following are questions/comments for this item as there has been an increase in soil activities on the site:
Question 1:
The soil vapor sampling appears to have been in a random pattern as opposed to a grid, how was this method selected?
Question 2 (after the two maps):
The CMP from February 22 indicates that the PCE (Tetrachloroethylene) found onsite at various locations is assumed to have come from offsite (not referring to the PCE at Sears Automotive). That
report is here: https://documents.geotracker.waterboards.ca.gov/esi/uploads/geo_report/9535237014/T10000017167.PDF For the following map numbers shaded in gray are over the Residential
Screening Levels for that Compound, this is a map of Soil Vapor testing.
The following map from that report shows potential sources of the PCE (typically used at Dry Cleaners, but is used as a degreaser for Auto shops).
Is it reasonable to conclude that one of these offsite sources has released enough PCE to have contaminated the Vallco site (leaving aside the onsite sources of PCBs, PCE, Benzene, etc.) to the extent
that it would be prudent for these sites, like the Holiday Cleaners (which also has an open remediation case), to begin an investigation? Is there something which would encourage the site or sites
which have contaminated the Vallco site to begin mitigation?
Thank you,
Kitty Moore
For further reference:
Geotracker: https://geotracker.waterboards.ca.gov/profile_report?global_id=T10000017167
VALLCO TOWN CENTER (T10000017167) - (MAP)
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10123 NORTH WOLFE ROAD
CUPERTINO, CA 95014
SANTA CLARA COUNTY
CLEANUP PROGRAM SITE (INFO)
OPEN - REMEDIATION AS OF 11/15/2022 - DEFINITION
Kitty Moore
Councilmember
City Council
KMoore@cupertino.gov
(408) 777-1389