Laserfiche WebLink
5ANJUAUUINWijhIT <br /> ENVIRONMENV' -'HEALTH DIVISION <br /> 304 E. Wet6.,4e.Third Floor <br /> P.O. Box 388, Stockton,CA 95201-0388 <br /> Phone: (209)468-3420 <br /> Xroved <br /> Mpproved with changes: See Remarks <br /> ❑Disapproved: See Remarks <br /> Remarks <br /> Dake By <br /> approval of these plans ext _ ds only to that <br /> which is shown and described hereon but <br /> does not authorize or approve ars; t:tr" ,:..>? ,;'1 <br /> or deviation of req it-aments of :Mato iw ti;s cjr <br /> ,. <br /> ling tea .. _ - — <br /> March 1.1999 <br /> 38737 004 <br /> FILE COPY <br /> Mr.Michael J.Irrfttrna.jr..RMSI <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 Fast Weber Avenue.Third Floor , <br /> Stockton.California 95202 <br /> Revised Werk Plan Addendum Number 3 and <br /> Scheduling of Field Work <br /> Supplemental Site Investigation <br /> Tri Valley Growers Plant T <br /> 26200 North Galt Road <br /> Thornton.California <br /> Site Code:1920 <br /> Dear Mr.lnfurna: <br /> On behalf of Tri Valley Growers(TVG),Harding Lawson Associates(IIIA)submits to San Joaquin County <br /> Public Health Services.Environmental Health Division(PHS/EHDJ,Revised Work Plan Addendum <br /> Number 3 for the supplemental site investigation being performed at the above referenced Underground <br /> Storage Tank(US n site. On February t7?,1999,a meeting was held at PHS/EHD offices attended by <br /> yourself and Ms Margaret Lagorio of the PHSIM.Mr.Mark list of the Regional Water Quality Control <br /> Board(RWQCB),Mr.Chris Savage of Tri Valley Growers(TVG),and Mssr Michael J.Leacox and Gary D. <br /> Haeck of Harding Lawson Associates{HLA). The purpose of meeting was to discuss recent field work <br /> findings that suggest a deeper plume of impacted groundwater may be present at the Site and the <br /> implications of these findings on completing site characterization and submission of a no-further-action <br /> request. The purpose of this Revised Work Plan Addendum Number 3 is to present a scope of work <br /> proposed by TVG to confirm or refute the Hydropunch analytical data(or the suggested presence of a <br /> deeper groundwater plume). <br /> BACKGROUND <br /> As described in HWs Work Plan Addendum,dated January 14,1998,and Work Plan Addendum Number <br /> 2,dated March 19,1998.the objective of the Supplemental Site Investigation was to collect the additional <br /> data required to submit a site closure request as a now risk"groundwater site. As discussed during the <br /> recent meeting,the field work performed on March 26 and 27.1996,included drilling three soil borings <br /> (HP-1,HP-2.and HP-3)to depths of 21.0.56.0,and 25.5 feet below the ground surface(bgs)at the former <br /> USI'location. Soil and groundwater samples were collected from the borings and analyzed for petroleum <br /> hydrocarbons. Some of the objectives of the work have been achieved. The vertical and lateral extent of <br /> impacted soil has been determined. However,analytical results from the groundwater samples indicate <br /> that dissolved petroleum hydrocarbons are present in the groundwater at depths below where previously <br /> identified. <br /> Analytical results on Hydropunch groundwater samples collected at depths of 22 to 28 feet bgs detected <br /> total petroleum hydrocarbons as gasoline(TPHg)and benzene concentrations ranging from 0.6 to 2.3 <br /> F_m..x.TW6ii Sw.= 10165 RoU&own Daae.StM 150.SOOVn lm CA 95827 9151364-0793 Pax:91&36+-563.'. <br />