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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K.Heran,R.E.HS. Third Floor Carl Borgman,R.E.H.S. <br /> UXDirector 304 East Weber Avenue, Mike Huggins,R.E.H.S.,R.D.I. <br /> —' <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • �<., r4• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Qui fio-RN Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> JAN THOMPSON / ERIC JENKS OCT 4 4 2044 <br /> WILBUR ELLIS COMPANY <br /> 191 W SHAW AVE SUITE 107 <br /> FRESNO CA 93704-2876 <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 field 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 8015B; and <br /> benzene,toluene,ethyl benzene, and total xylenes(BTEX)by EPA SW-846 method 8021. <br />