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. Mr. Harlin Knoll <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> Page 5 <br /> May 18, 1995 <br /> Borings SB-1 through SB-3 will be completed as 2-inch diameter <br /> monitoring wells MW-1 through MW--3 , respectively. The wells will <br /> be constructed of 2-inch diameter PVC casing with 0 . 020 inch <br /> slotted screen installed from the bottom of the boring to <br /> approximately 10 feet above first encountered groundwater to allow <br /> for seasonal groundwater fluctuations. A two foot thick bentonite <br /> plug will be placed above the filter pack. The remaining annular <br /> space will be grouted with a cement slurry to ground surface. Upon <br /> completion, the wellheads will be surveyed with an accuracy of 0. 01 <br /> feet relative to mean sea level . <br /> Selected soil samples collected from the borings will be analyzed <br /> by a State certified laboratory for total petroleum hydrocarbons as <br /> gasoline (TPHg) using EPA Method 8015 ; benzene, toluene, <br /> ethylbenze, and total xylenes (BTEX) using EPA Method 8020, and <br /> leachable (TCLP) TPHg and BTEX. In addition, selected soil samples <br /> collected from the borings will be analyzed for physical parameters <br /> including vertical permeability, effective porosity, moisture <br /> content, bulk density and particle size distribution. Selected <br /> soil samples collected from the borings will also be analyzed for <br /> chemical/biological parameters including total organic carbon <br /> (TOC) ; heterotropic plate count; and phosphorus, potassium, <br /> nitrogen (PKN) . <br /> The completed wells will be developed, purged and sampled within 48 <br /> hours of completion. <br /> Groundwater samples collected from the wells will be delivered <br /> under chain of custody to a State certified laboratory and analyzed <br /> for TPHg using EPA Method 8015M, and BTEX using EPA Method 8020 . <br /> A technical summary report will be prepared which will include all <br /> analytical results, a scale drawing of the site with sample <br /> locations, conclusions, and recommendations (as appropriate) for <br /> additional work at the site. If appropriate, the report will <br /> include an analysis of the leachability of gasoline hydrocarbon <br /> impacted soil remaining at the site and the potential threat to <br /> water quality. All field and laboratory activities performed at <br /> the site will be conducted in accordance with the attached Quality <br /> Assurance/Quality Control Plan. <br /> The wells will be purged and sampled approximately 90 days after <br /> the first sampling event has been completed and a brief report <br /> prepared summarizing the results. If gasoline hydrocarbons are not <br /> detected in groundwater samples collected from the wells during <br />