ARCHIVED REPORTS_ENVIRONMENTAL SITE ASSESSMENT

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SECTION IV. FIELD ACTIVITIES A. UTILITY LOCATION Underground Service Alert (USA aka Dig Alert) was contacted and the Dig Alert ticket #0089128 was issued. A boring permit application and workplan were submitted to the San Joaquin County Environmental Health Department. A permit was issued for the borings on the project site on March 16, 2012. The on-site geophysical survey completed by Sierra Nevada GSI (Sierra) found several radar anomalies including: four potential USTs, underground utilities, and two large septic tanks. Former trenches for stormwater drainage along the northern portion of the building were observed by Sierra and PEI to be concrete-filled and obvious. Please note that due to significant alterations to the property's surface and structures over time (e.g., site re-paving, pavement patching, installation and removal of interior and exterior equipment and subsurface items, etc.), visual observations and geophysical survey results may have been affected such that potential areas or items of concern may not have been readily recognizable or included in the work performed. Permits and clearances are documented in Appendix D. B. HEALTH AND SAFETY PLAN A site-specific Health and Safety Plan (HASP)--compliant with the requirements of 29 CFR Part 1910.120, 8 CCR 5192, and the EPA Standard Operating Safety Guides for Hazardous Waste Operations (1986)—was developed for PEI personnel prior to field activities. Based on the conditions of the site, the expected levels of constituents present in the soil, and the type of work performed, all activities were conducted in Level D Personal Protective Equipment (PPE). The HASP provided the requisite details and guidance for PEI personnel. C. DRILLING METHODS PEI subcontracted the drilling services of InterPhase Environmental, Inc., for the March 19 to 23, 2012, field work to obtain soil vapor, soil matrix, and groundwater grab samples at the Site, using a Geoprobe® 6600 direct-push drilling rig. Weather at the time of the drilling was cool and partly overcast with temperatures in the mid 50°s F. The field work was accomplished in five field days and included 26 soil vapor locations (SV-1 to SV-26, with 1 soil vapor and 1 soil matrix sample each), 20 soil borings (SB-101 to SB-120, with one soil matrix sample each), and four temporary groundwater wells (GW-1 to GW-4, with two soil matrix samples and one groundwater sample each). In all, there were collected and analyzed 54 soil matrix samples from 50 vapor/matrix/groundwater locations, 25 soil vapor samples Limited Phase II Environmental Site Assessment Report Pinnacle Environmental,Inc. 248 Industrial Avenue,Stockton,CA 95206 Page 11