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A, <br /> ENVIRON`��r�IE <br /> NTAL HEALTH jiEpARTMEN <br /> OPQU'" C SAN JOAQUIN COUNTY program Coordinators <br /> Donna K. Heran,R.E.H.S. 304 East Weber Avenue,Third Floor Carl Borgman, R.E.H.S. <br /> ` DirectorMike Huggins, R.E.H.S., R.D.I. <br /> Laurie A. Cotulia,R.E.H.S. Stockton,California 95202-2708 Margaret Lagorio, R.E.H.S. <br /> • �q., a�P Assistant Director Telephone: (209)468-3420 Robert McClellon, R.E.H.S. <br /> �1fi0� <br /> Fax: (209) 464-0138 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley,R.E.H.S. <br /> SEP 1 8 2006 <br /> CRAIG OGATA <br /> DIRECTOR OF FACILITIES MANAGEMENT <br /> 212 N SAN JOAQUIN STREET SUITE A <br /> STOCKTON CA 95202 <br /> RE: San Joaquin County Courthouse SITE CODE: 1285 <br /> 222 East Weber Avenue RO: 11 <br /> Stockton, CA 95202 <br /> San Joaquin County Environmental Health Department .(EHD) has reviewed Revised <br /> Work Plan and Groundwater Monitoring Report Second Quarter 2006 dated August 4, <br /> 2006, submitted by Ramage Environmental, Inc. (Ramage Environmental) on your <br /> behalf. In this work plan Ramage Environmental proposes to advance three soil borings <br /> to first groundwater. Two of the proposed borings will be located at the sub-grade <br /> parking area, one in the southwest corner.approximately 66 feet southwest of monitoring <br /> well MW-1, and one approximately 65 feet north of MWA; and one proposed boring will <br /> be located in the southeast corner of the street grade parking lot approximately 78 feet <br /> southeast of MW-1. Ramage Environmental also proposes that the two soil borings <br /> proposed for the sub-grade parking area be advanced to approximately 25 feet below <br /> surface grade (bsg), and implies that the soil boring proposed to be advanced in the <br /> southeast corner of the street grade asphalt parking area be advanced to approximately 30 <br /> to 35 feet bsg. <br /> Groundwater is currently reported at approximately 12.5 feet bsg at the sub-grade parking <br /> area and approximately 24.5 feet bsg at the street grade parking lot. Because the sand <br /> layer identified at approximately 30 to 35 feet bgs at the street grade is a potential lateral <br /> migration pathway for dissolved contaminants, EHD approves the advancement of the <br /> two soil borings to approximately 25 feet bgs at the sub-grade parking area, and the <br /> advancement of the one soil boring to approximately 35 feet bgs at the street-grade <br /> parking area. <br /> EHD also concurs with the collection of soil samples at five-foot intervals for <br /> hydrogeologic and lithologic characterization and the collection of at least three soil <br /> samples and one grab groundwater sampler per boring for submission to a California <br /> certified laboratory for analysis. Selection of soil samples will be based on field <br /> observations and concentrations reported using a photoionization detector. <br />