ARCHIVED REPORTS XR0012683 - Laserfiche WebLink

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Oi Cck- r, 1., PRE-TASITE oS ST 310RWORKPLANyw� ISOs 5.. El Dorado, Stockton, G •YF'��Y' I Aegis Project mo. 90-205 p '4 Page 3 perimeter, Underground Service Alert (USA) will not be notified for this phase of work. Two soil borings will be drilledadjacent to/ the existing tank basin and will be angled at approximately 30° - n Ea order to retrieve samples from beneath the tank basin. Drilling i , will be performed in accordance with Aegis' Standard operating Procedures (SOP--1; included as Appendix B. The borings are proposed to be drilled to a depth of approximately fifty-five. (55)t 6D .„ feet bas. If groundwater is encountered, the baring will be terminated. During drilling, the subsurface soils and alluvial materials of the ` unsaturated zone will be sampled/screened at a intervals in accordance with Aegis SOP-2 A Howe approximately However, it F:= g Appendix B. However, t must be noted that due to the angle at which the slant borings are < ' proposed to be drilled, sample retrieval may not be possible at all sampling intervals. Also due to the proposed slant boring method, the associated blOWCount data will not be directly representative of the soil density or consistency. The samples will be described according to the Unified Soil Classification System (USCS) and �.: Aegis' SOP-3, Appendix B. E tr Retrieved soil samples will be screened in the field by a portable ° photoionization detector (PID) to assist in sample selection for laboratory analysis. The soil samples selected for analytical testing will be delivered under chain-of-custody to a state- certified analytical laboratory according to Aegis' SOP-4, Appendix B. to r All drilling and soil sampling equipment will be steam cleaned prior to first use, and between borings, to eliminate the possibility of cross-contamination. Rinsewater will be stored ~ ,temporarily on site in 55- gallon drums, pending laboratory analysis E� of the! boring samples. Following receipt of the laboratory results, the rinsewater will be transported from the site to ° appropriate disposal facility. an The selected soil samples will be analyzed following the SJCPHSD's a "Sampling Protocol for Routine Tank Removals" (included as Appendix C) for concentrations of: Total Petroleum Hydrocarbons, as gasoline j (TPH) , Benzene, Toluene, total Xylenes, and Ethylbenzene (BTX&E) and Ethylene dib_tomide (EDB) , by GCFID/MS, EPA Method 8260. In addition, the samples will be tested for Total Lead constituents by Flame AA, EPA Method 7420. 90-205A.WP1! i 90-205.WP: t i