ARCHIVED REPORTS_ENVIRONMENTAL SITE ASSESSMENT ADDENDUM

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SECTION III. 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 (SJCEHD). A permit (SR0065524) was issued for the borings on the project site on August 17, 2012 (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 EnProbe Environmental Probing for the August 21 and 22, 2012, field work to obtain soil matrix and groundwater grab samples with a Geoprobe® 6600 drill rig. Weather at the time of the field work was warm and partly overcast, with a temperature of about 85°F. The field work was accomplished in two field days and included 8 locations (SB-1001 to SB-1008, Figure 2). With the exception of SB- 1008 (3 samples only), four soil matrix samples were collected from each location(31 plus two duplicate samples). Seven temporary groundwater wells (SB-1001 to SB-1007 were installed from which groundwater samples were collected and analyzed. No groundwater was collected from SB-1008 because an obstruction was encountered at approximately 20 feet below ground surface (bgs). The initial proposed scope included 7 sample locations. An eighth location(SB- 1006) was added to test the chemistry of soil and groundwater to the west of the septic system. All down-hole drilling equipment was decontaminated using a three-stage process of a non- phosphate grade detergent (Alconox) mixed with potable water, a potable water rinse and a de- ionized water rinse. After collection of samples, each borehole was backfilled to near-surface with Portland cement grout, then sealed with a plug to match the existing ground cover. The well abandonment was observed by SJCEHD personnel. Addendum to Limited Phase II Environmental Site Assessment Report Pinnacle Environmental,Inc. 248 Industrial Avenue,Stockton,CA 95206 Page 6