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C <br /> ! ENVIRONS 4ENTAL HEALTH `DEPARTMENT <br /> o 0 N c <br /> ` SAN JOAQUIN COUNT' <br /> Donna K. Heran, R.E.H.S. Program Coordinators <br /> Director 304 East Weber Avenue,Third.Floor Cart Borgman, R.E.H.S. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S.,R.D.I. <br /> cq`�Fo;.RN�c Assistant Director Telephone.: (209)468-3420 Margaret Lagorio, R.E.H.S. <br /> Robert McClellon,R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley,R.E.H.S. <br /> DENIS L. BROWN <br /> SHELL OIL PRODUCTS US NOV 13 2006 <br /> HSE — ENVIRONMENTAL SERVICES <br /> 20945 SOUTH WILMINGTON AVENUE <br /> CARSON CA 90810-1039 <br /> RE: Interstate Shell SITE CODE:' 1058124 <br /> 620 West Charter Way <br /> Stockton, California 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site Investigation <br /> Work Plan (work plan), dated November 1, 2006, prepared and submitted by Cambria <br /> Environmental Technology, Inc. (Cambria) on your behalf for the above-referenced site. The work <br /> plan proposes the advancement of one cone penetration testing (CPT) boring (CPT-18) and paired <br /> direct-push boring, located up-gradient of.the source areas to assess soil lithology and stratigraphy <br /> and collect soil and groundwater samples, for chemical analysis; and installation of thirteen <br /> groundwater monitoring wells to further assess the groundwater plume. <br /> Cambria proposes installing one shallow monitoring well, MW-11, with a 15-foot screen interval <br /> placed five feet above, and ten feet below the depth of first-encountered groundwater. This well <br /> will be located north of West Charter Way at the south side of McDonald's Restaurant, and <br /> approximately 125 feet down-gradient of MW-9 and onsite underground storage tanks(USTs). <br /> Cambria proposes installing six monitoring wells with a five-foot screen interval placed <br /> approximately 45 to 50 feet below ground surface (bgs)at the following locations: <br /> • MW-12-50 would be installed onsite, approximately 15 feet south of MW-7; <br /> • MW-13=50 would be installed at the northern premises of Best Western Motel, <br /> approximately 60 feet east of MW-7; <br /> • MW-14-50 would be installed in the parking lot of Best Western Motel, approximately 60 <br /> feet east;southeast of MW-5; <br /> • MW-15-50 would be installed north of West Charter Way at the southwest corner of Delta <br /> Market,approximately 35 feet southeast of MW-10; <br /> • MW-16-50 would be installed onsite, approximately 20 feet east, southeast of MW-8,- <br /> a MW-17-50 would be installed at the site of the former USTs, approximately 10 feet <br /> southeast of MW-2. <br /> Cambria proposes installing six monitoring wells with five- to ten-foot screen`intervals placed <br /> approximately 65 to 77 feet bgs at the following locations: <br /> I <br /> i <br />