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ENVIRONIMENTAL HEALT"EPARTMENT <br /> saPqu l~,,.CD <br /> c 2 <br /> Donna K. Heron, R.E.H.S. SAN JOAQUIN COUNTY <br /> •i :< Director304 East Weber Avenue,Third Floor Unit supervisors <br /> Laurie A. Cotulla, R.E.H.S. Carl Borgman,R.E.H.S. <br /> • c•.. - P. Program Manager $[OCk[On,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> iiijy-, Telephone: (209)468-3420 Douglas W. Wilson,R.E.H.S. <br /> Fax: (209)464-0138 Margaret Lagorio,R.E.H.S. <br /> Robert McClellan, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco,R.E.H.S. <br /> D CHARLES SKOBRAK MAR 3 0 2006 <br /> 9947 EAST HIGHWAY 26 <br /> STOCKTON CA 95215 <br /> RE: Larry's Auto SITE CODE: 1122 <br /> 308 North Grant Street RO: 194 <br /> Stockton,CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Well <br /> Installation Work Plan — February 2006 dated February 28, 2006, submitted by Advanced <br /> GeoEnvironmental, Inc. (AGE) on your behalf. In this work plan AGE proposes to install <br /> four monitoring wells to delineate the extent of migration of groundwater impacted by high <br /> concentrations of petroleum hydrocarbon compounds. The proposed wells include: <br /> • Two monitoring wells screened between approximately 30 and 50 feet below surface <br /> grade (bsg); one well to be installed inside the building occupied by Larry's Auto, <br /> approximately 75 feet southeast of monitoring well MW-1; and one well to be <br /> installed beneath the sidewalk on the north side of Miner Avenue, approximately 90 <br /> feet east of MW-4. <br /> • Two monitoring wells screened between approximately 95 and 100 feet bsg; one well <br /> to be installed adjacent to MW-1, and one well to be installed beneath the sidewalk on <br /> the north side of Miner Avenue, approximately 15 feet east of MW-4. <br /> EHD approves installation of the two monitoring wells screened between approximately 30 <br /> and 50 feet bsg. However, EHD does not believe the two proposed monitoring wells <br /> screened between approximately 95 to 100 feet bsg are appropriately screened. Based on soil <br /> lithology for cone penetrometer test (CPT) boring CPT-1, EHD believes two monitoring <br /> wells should be installed adjacent to MW-1, one screened between approximately 129 and <br /> 134 feet bsg, and one screened between approximately 158 and 163 feet bsg. Also, based on <br /> soil lithology for CPT-2,EHD believes two monitoring wells should be installed beneath the <br /> sidewalk on the north side of Miner Avenue, approximately 15 feet east of MW-4, one <br /> screened between approximately 68 and 76 feet bsg, and one screened between <br /> approximately 91 and 96 feet bsg. <br />