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y <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> >o'.-,a[`�'cOG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> s - : <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> cgir . -aw • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotuila,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> NOV 0 3-2004 <br /> JAN THOMPSON <br /> WILBUR ELLIS COMPANY <br /> P O BOX 1286 <br /> FRESNO CA 9371.5 <br /> RE: H&H Engineering and Construction Facility SITE CODE: 507797 <br /> 212 Industrial Drive RO: 623 <br /> Stockton, CA 95206 <br /> San Joaquin County Environmental Health Department(EHD)has reviewed the Work Plan for <br /> Additional Subsurface Investigation prepared by Ground Zero Analysis, Inc. (Ground Zero)on your <br /> behalf. In this work plan Ground Zero proposes to advance six borings to approximately 40 feet <br /> below surface grade (bsg),and one boring to approximately 10 feet bsg to further delineate the <br /> lateral extent of groundwater contamination. EHD comments on this work plan as follows: <br /> • EHD recommends that the two borings proposed to be advanced to approximately forty <br /> feet bsg along the northeastern side of the property near the fence,instead be advanced to <br /> approximately fifty feet bsg and converted into monitoring wells with screened intervals <br /> from 30 to 50 feet bsg to assess the down-gradient groundwater contamination. <br /> • EHD concurs with Ground Zero's proposal to advance one boring near the former fuel <br /> dispenser to a total depth of approximately 10 feet bsg. <br /> • EHD concurs with Ground Zero's proposal to advance two borings to approximately 40 <br /> feet bsg, one to be located east of the truck scales, and one to be located south of the truck <br /> scales. <br /> • EHD does not approve,at this time,the proposed advancement of two borings along the <br /> southwestern side of the property, one boring to be located west and one boring to be located <br /> southwest of the small building at this site. However, should held observations demonstrate <br /> the presence of contamination during the advancement of the two borings east and south of <br /> the truck scales,the two western borings can be reconsidered. <br /> • EHD concurs with Ground Zero's proposal to collect soil samples at five-foot intervals for <br /> lithological identification and field screening for contamination; and based on field <br /> observations, at least two soil samples from each boring will be submitted to a State of <br /> California-certified laboratory for the analyses of total petroleum hydrocarbons as gasoline <br /> (TPH-G)by Environmental Protection Agency(EPA)SW-846 method 801513; and <br /> benzene,toluene, ethyl benzene, and total xylenes(13TEX)by EPA SW-846 method 8021. <br />