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SAN JOAQUIN COUNTY PUBLIC HEALTH SERVICES <br /> ENVIRONMENTAL HEALTH DIVISION <br /> SITE MITIGATION UNIT San Joaquin County <br /> 304 E.WEBER STREET <br /> STOCKTON CA 95201 Public Health <br /> RON ROWE Services <br /> SENIOR REHS Environmental <br /> PHONE#209 468-0342Division Health <br /> FAX#209 468-3433 <br /> Fax <br /> To: Steven Ronzone/Keith Sheets From: RON ROWE <br /> Del Monte RE: 110 Filbert St Stockton PHS/EHD SITE MITIGATION UNIT <br /> Fax: 415-247-3540/510-622-9101 Pages: 4 <br /> Phone. 415-247-3520/510-251-2888 Date: 5 November, 1999 <br /> Re: Workplan Approval CC:Please complete and submit borehole app. <br /> `. ❑ Urgent ❑ For Review ❑ Please Comment ❑ Please Reply ❑ Please Recycle <br /> • Comments: Mr. Ronzone <br /> In response to our 5 November 1999 telephone conversations PHS/EHD has approved the <br /> October 1999 CH2MHILL Site Investigation Workplan with the following conditions (no <br /> amendment is needed). CPT work is tentatively scheduled for December 13-17, 1999, to be <br /> witnessed by PHS/EHD. <br /> The CPT will be used first to develop a fundamental stratigraphic site conceptual model. The <br /> first 7 CPT holes shall collect continuous core data.All 7 CPT boreholes shall be installed to a <br /> total depth of 150' bgs first (acknowledging refusal potential). Calibration checks with nearby <br /> existing hollow stem auger borehole logs will be necessary, your field geologist should bring <br /> representative borehole logs to the site each day during this scope of work. The field geologist <br /> will then construct rough cross-sectional sketches. The cross-sections will be employed to <br /> determine sample points vertically and laterally with a predominant focus on preferential flow <br /> paths (coarse grain deposits/more transmissive units in the saturated zone). Pore dissipation <br /> tests may be recorded by the CPT operator upon request by the field geologist and PHS/EHD to <br /> better understand the subsurface hydrodynamics. Sample collection frequency shall be <br /> dictated by site specific conditions in the subsurface, both soil and groundwater samples must <br /> be collected from significantly different lithologic units encountered. See attached workplan <br /> stamped approval. Should you have questions regarding this correspondence please contact <br /> me at(209)468-0342.Thanks, Ron. <br />