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PUBLS HEALT,U SE9PY' 10ES ;­ <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA KD.,M.P.H. <br /> Health Officer <br /> P.O.Box.2009 (1601 East Hazelton Avenue) • Stockton,California 95201 <br /> (209)468-3400 <br /> August 3, 1989 <br /> San Joaquin County ❑ <br /> Department of:,Gen'eral Services <br /> Larry Silva/James Leonard <br /> 222 E. Weber Avenue <br /> Courthouse Rm.' 67,5 <br /> Stockton,' CA 95202 <br /> RE: SITE ASSESSMENT WORK PLAN, SAN JOAQUIN MOTOR POOL <br /> h <br /> 444 S WILSON WAY; STOCKTON. <br /> Please be advised that this office has reviewed the above referenced work plan <br /> and the addendum and have found it to be, adequate provided the following <br /> comments are addressed in the Soil Remeiation Report or Preliminary Report. 1 <br /> a <br /> 1. We recommend that the soil boring construction be amended to include <br /> continuous 'core- drilling on at least one boring to groundwater. A <br /> detailed description of the sampling procedure to be used during <br /> drilling should be included in the completed report. <br /> 2. The soil borings at location #2 shall extend to groundwater due to the <br /> elevated levels of TPH in samples-i812231 and 812229 which were 620 mg/kg <br /> and 310,' mg/kg respectively. <br /> 3. We recommend that. all soil boring have the bottom sample, analyzed by a <br /> state certified laboratory in order to provide minimum verification <br /> "zero line". <br /> �s <br /> 4. All soil samples submitted to the:;laboratory for analysis shall be <br /> analyzed for the constituents andlby the methods recommended in Table #2 <br /> of the Tri—Regional Staf€,Recommendation. <br /> - al <br /> ii <br /> 5. The extraction tube to be noted on Plate 4 shall be removed or <br /> investigated for elimination as a 'source of contamination. <br /> Due to the proximity of groundwater, a groundwater investigation may be <br /> necessary regardless of the outcome of this soil evaluation. Please refer. to <br /> the Tri—Regionall.Buidelines for InitialtEvaluation and Investigation of <br /> Underground Storage Tanks for future assessment and preliminary reports. <br /> s <br /> A Division of San Joaquin CountyHealth Care Services <br />