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�, 23 June 1998 AGE-NC Project No. 97-0349 Page 4 of 5 - Five domestic ground water wells, owned and operated by:the California Water Service were. discovered within the search range north of the site. Six domestic water wells were discovered south of the site in the search area. Three ground water monitoring wells are located on,the site in*accordance with a Cleanup and Abatement order from the Central Valley.Regional Water Quality.Control Board'L Ground water depths on the site are 50 feet bsg. Wells from the California Water Resources were located on FCD&WCD maps in the area,however, their exact locations were not verifiable, 4.0. FINDINGS ; 4.1. STRATIGRAPHY AND DEPTH TO GROUND WATER • Tan and brown, silty clay was encountered in the probe boring from approximately 10 feet bsg to 30 feet bsg: Tan silty sand was encountered in the probe boring from approximately 30 feet bsg to 35 feet bsg. Red-brown silty clay was encountered in the boring from 3.5 to.40 feet bsg. Tan and brown silty clay was encountered from approximately 40 feet bsg to 55 feet bsg. Ground water was tow encountered at an approximate depth of 59 feet bsg and a sample was cgllected at 60 to 64 feet bsg.:_ Soil boring logs are depicted in Appendix A., Lw� 4.2. HYDROCARBON-IMPACTED SOIL Petroleum hydrocarbons were not detected in soil below the UST at depths of 15 and 20 feet bsg nor at 50 feet bsg. The laboratory report(MAI Laboratory ID 80089 to 80091), QA/QC reports and. chain-of-custody forms are included in Appendix B., 4.3. HYDROCARBON=IMPACTED GROUND WATER TPH-d was detected in the water sample collected from probe boring PB I at concentrations of 0.69 parts per billion -(ppb, reported as micrograms per liter). BTE&X compounds, oxygenated compounds and TPH-g were not detected the water sample.The laboratory reports-(MAI Laboratory ID 80088), QA/QC reports-and chain-of-custody forms are included iri Appendix B. Advanced CeoEnvironmental,Inc. ..