SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Unifirst Corporation page 2 Work plan comment COMMENTS AND CONDITIONS: (continued) • The proposal included only quarterly sampling for one year. California Code of Regulations, Underground Storage Tank requirements (sect 2652d) require report submittal every three months until the investigation and cleanup are complete. SJCEHD will require monitoring well sampling reports to be submitted quarterly and continued until notified otherwise. • Monitoring well installation procedures included in the work plan noted, "a small amount of potable water will be added (if necessary) to facilitate efficient placement of the filter pack". SJCEHD will require instead, that the PVC casing be `surge-blocked' to compact the filter pack prior to setting the bentonite seal. • Also included in the monitoring well construction details was the emplacement of grout by "free-fall". Although SJCEHD does allow grout placement typically in some soil borings by free-fall (not to exceed 30-feet) experience has shown that free falling this heavy material onto a soft bentonite seal of a monitoring well has created problems with the well later on. SJCEHD recommends that the grout be tremied pumped from the bottom-up instead of being emplaced by free-fall from the surface. • California Code of Regulations (CCR-section 2729.1) requires UST investigative/remedial data to be electronically submitted to Geotracker. Please have your consultant ensure that the laboratory data, monitoring well survey (X & Y/Geo data) and the site/location map are submitted to the SWRCB Geotracker database. • Please submit a Well Permit Application Form and the $89 fee now. REASONS FOR DISAPPROVAL OF THE WORKPLAN [H&S Section 25296.1 0(c)(3)1: • none. DATED: March 25, 2005 BY G �S6 Michael Infurna, VLHS. (209) 468-3454 c: CVRWQCB — James L. Barton, Sacramento. c: SWRCB — CUF — Mark Owens, Sacramento. c: URS — Erik Skov, 221 Main Street#600, San Francisco 94105-1917 [X] faxed to consultant on: 3-28-05