SITE INFORMATION AND CORRESPONDENCE_FILE 1

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ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY Unit Supervisors Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. 304 East Weber Avenue, Third Floor Director Mike Huggins,R.E.H.S.,R.D.I. Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. • cq. ....:;i. Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. Laurie A.Cotulla,R.E.H.S. Robert McClellan,R.E.H.S. Program Manager Fax: (209)464-0138 Mark Barcellos,R.E.H.S. JAY MCILRATH DEC 12 2003 JC & M MCILRATH PO BOX 326 STOCKTON CA 95201 RE: JAMAR Service SITE CODE: 1667 4075 Main Street Stockton CA 95212 San Joaquin County Environmental Health Department (SJC/EHD) has reviewed the "Work Plan Addendum"dated November 20, 2003 that was submitted on your behalf by GHH Engineering, Inc. (GHH) and has the following comments. The work plan addendum was submitted in response to SJC/EHD correspondence dated November 7, 2003. Key issues will be addressed numerically. 1. In the original work plan GHH stated that the proposed locations of additional down gradient monitoring wells were based on calculated groundwater flow direction, but the locations marked on the included map did not show them located thus. In the addendum GHH states the locations were based on groundwater flow direction and contaminant distribution, and proposed to move one set of wells onto the vacant property at the southeast corner of Main Street and Oro Ave. SJC/EHD approves this location, if an access agreement from the property owner can be obtained within a reasonable amount of time. Another possible location would be to site the wells on Annabelle Lane. Annabelle Lane appears to be a county road, with plenty of room for accessibility of the necessary drilling equipment. Since submitting this addendum GHH has contacted SJC/EHD and requested to move the well locations back to those proposed in the original work plan. SJC/EHD does not approve of those locations. There must be monitoring wells located to the southeast of your site. 2. In the addendum GHH refers to the "plume"from the former gasoline station located on the southwest corner of Oro Ave. and Main Street. Please note that no data has been submitted to SJC/EHD documenting a groundwater contaminant plume at that site. When groundwater information from that site becomes available it can be reviewed in relation to your site, but currently the only data submitted to SJC/EHD reports soil contamination at the south end of their former tank pit, and all analyses for methyl tertiary butyl ether in the soil were non-detect. The possibility that groundwater contamination exists at the nearby site does not preclude you from fully defining the groundwater plume originating from your site. As this neighboring site is located cross-to down gradient from your site, the investigation of the edges of your plume should extend to the south side of Main Street, which would be up gradient of the neighboring site.