SITE INFORMATION AND CORRESPONDENCE FILE 1

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San Joaquin County DIRECTOR Donna Heran,REHS Environmental Health Department ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla,REHS Stockton, California 95202-3029 PROGRAM COORDINATORS Carl Borgman,REHS Mike Huggins,REHS, RDI Website: www.sjgov.org/ehd Margaret Lagorio,REHS �'Fib R Phone: (209) 468-3420 Robert McClellon,REHS Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI Kasey Foley,REHS October 1, 2008 T LT �Q Mr. John Parker 2151 Country Club Boulevard Stockton, CA 95204 Subject: Boulevard Auto Service ROM 080 2151 Country Club Blvd. SWRCB-CUF#: 12962 Stockton, CA 95205 Geotracker ID#: T0607700030 The San Joaquin County Environmental Health Department (EHD) has received and reviewed Quarterly Report — First Quarter 2008 (QMR) dated August 18, 2008, prepared by Advanced GeoEnvironmental Inc for the above referenced subject site. The QMR covers the collection and analyses of ground water samples from the monitoring wells associated with this site on February 11, 2008. Recommendations in the QMR included removal of ETBE, DIPE, TBA, and EDB from the list of compounds on the site's quarterly ground water monitoring program. The EHD has reviewed the history of the monitoring for the site and concurs with your request. Be advised, as the site approaches the end of the remediation phase and prepares for a no further action determination, these compounds may have to be included for analyses again for at least the last two consecutive monitoring events. Also included in the recommendation section of the QMR was a proposal to continue the lateral and vertical ground water investigation for this site. Deep onsite monitoring well MW-16 and deep offsite MW-18 continue to indicate that high concentrations of Total Petroleum Hydrocarbons as gasoline (TPHg) and other petroleum constituents are present at 70 to 80 feet below the surface ('bgs). This indicates that the dissolved hydrocarbon plume is not vertically defined. The installation of deeper monitoring wells was proposed near these two wells to further define the vertical extent of the dissolved hydrocarbon plume. The EHD concurs with this recommendation. In addition to the continued vertical investigation at MW-16 and MW-18, a proposal to install a monitoring well 250 feet north-northwest of MW-19 was recommended in the QMR. The EHD has evaluated this recommendation and determined that the dissolved hydrocarbon impacted ground water plume is not defined north of MW-19 and that a lateral investigation is warranted. Prior to installing an additional monitoring well on Oxford Avenue, the EHD believes additional subsurface investigation on Oxford Avenue and on Franklin Avenue is needed to more accurately place a monitoring well. The EHD recommends that additional CPT borings be placed on Oxford Avenue west of Franklin, at the northwest corner of Oxford Avenue and Franklin Avenue, and between this intersection and the former location of "P-11". These borings will allow for the collection of grab ground water samples from permeable intervals potentially at approximately 40' to 50' bgs and 70' to 80' bgs, as well as 90' to 100' bgs, and verify that the dissolved hydrocarbon plume is not descending further as it migrates laterally, or if the plume has passed to the west of P-11.