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P <br /> Phan F[•Int, <br /> J'Ap 2 <br /> levels of BTX and lead,however the BTX detection limit was 1 ppm,and the lead detectiosi limit <br /> 04 <br /> was 10 ppm. Furthermore, the analytical groundwater results did not detect B'TX(detection limit <br /> }` of 20 ppb). <br /> In a correspondence dated October 15, 1991, the San Joaquin County Public Health <br /> i Services/Environmental Health Department (PHS/EHD) questioned the validity analytical data <br /> obtained during Ilie subsurface investigation performed by J.H.Mcinfelder&Associates. Specific <br /> i areas of concern were the high BTX detection limits of the soil and groundwater analyses, the <br /> sandy soil conditions observed at the base of the former tank location, and the lack of drilling <br /> t logs/inonitoring well construction data for the temporary monitoring %yell. A copy of this <br /> correspondence is provided in Appendix B. 'Elie PHS/EHD currently recommends a BTX <br /> detection limit of 0.005 ppm (soil)and 5 ppb (water). Furthermore, the PHS/EHD did not feel <br /> that the horizontal and vertical extent of contaminant migration had been adequately addressed. <br /> l ` 20 SCOPE OF SERVICES <br /> ; w <br /> The scope of work for the Phase II Environmental Audit includes: <br /> Submitting a work plan to PHS/EHD stating the proposed number and location of test <br /> holes and monitoring wells, soil sampling plan, typical monitoring well construction <br /> diagrams, and a Site Safety Plan. This data is included in Appendix C. <br /> f. <br /> Obtaining a monitoring well permit a?placation from PHS/EHD stating the number of <br /> moni,oring wells and their approxima.c locations at the Diamond Lumber site. <br /> Collecting split spoon soil samples at live Foot depth intervals during the drilling of each <br /> well for soil classification and field screening of organic vapors. Submitting selected soil <br /> samples for laboratory analysis. <br /> • Installing, purging and sampling the wells according to PHS/EHD guidelines. <br /> w Properly abandoning the temporary monitoring well according to PHS/EHD guidelines. i <br /> Determining the localized groundwater gradient by measuring the static water level <br /> — relative to the top of casing. A land surveyor will be retained to provide elevations at the <br /> —top of well heads relative to a known datum,and the locations of the wells relative to on- <br /> site structures. This information will be forwarded as an addendum in the near future. <br /> ies•.ur,.�.. - - Sic P[e¢1lobertW¢and}:lnlen - <br />