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San Joaquin County DIRECTOR Donna Heran, REHS Environmental Health Department ASSISTANT DIRECTOR G 600 East Main Street Laurie Cotulla, REHS Stockton, California 95202-3029 W: { PROGRAM COORDINATORS Cart Borgman, REHS .� Mike Huggins, REHS,RDI c4•_�,' .�;�° Website: www.sjgov.org/ehd Margaret Lagorio, REHS L r F R Phone: (209)468-3420 Robert McClellon,REHS Fax: (209)464-0138 Jeff Carruesco,REHS, RDI Kasey Foley, REHS March 17, 2008 Mr. Amrit Grewal Grewal's Market 4100 East Fremont Street Stockton, California 95215 ,Subject: Grewal's Market 4100 East Fremont Street Stockton, CA 95215 The San Joaquin County Environmental Health Department (EHD) has reviewed Revision to Work Plan Addendum —December 2007, dated March 5, 2008, prepared and submitted by Advanced GeoEnvironmental, Inc. on your behalf for the above-referenced site. In the revised work plan, AGE proposes to relocate off-site soil boring P-17 approximately ten to twenty feet toward the west and advance P-17 on property at 4010 East Fremont Street, Stockton, California. (Soil boring P-17 was originally labeled P-19 on Figure 2 of the December work plan approved by the EHD by letter dated January 18, 2008.) AGE also proposes to move groundwater monitoring well (MW-5) approximately ten to twenty feet toward the east of the location previously approved by the EHD and install MW-5 on property at 716 North Oro Street, Stockton, California. Lastly, AGE proposes to advance soil borings P-15, P-16, and P-17 using a cone penetration test (CPT) drill rig in place of a hollow stem drill rig. The EHD approves the advancement of soil boring P-17 on property located at 4010 East Fremont Street, and the advancement of soil borings P-15, P-16, and P-17 using a CPT drill rig. However, the EHD does not approve the installation of MW-5 on property located at 716 Oro Street. Groundwater flow direction has generally been toward the southwest at this site, and the EHD believes relocating MW-5 toward the east will further remove the monitoring well from being down gradient of MW-4, the well most impacted by 1,2- dichloroethane (1,2-DCA). Instead, the EHD recommends that you complete the fieldwork in two phases by first advancing the three soil borings; data generated from this phase of the investigation may be used to determine the best location for installing MW-5. The EHD is returning the check that included the boring permit and inspection fees for installing MW-5 submitted by AGE. Please submit a permit/inspection fee of$766 to the EHD for the advancement of P-15 and P-16 on-site, and P-17 off-site, and notify the EHD at least a week prior to the scheduled work date.