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29 August 2017 AdvancedGeo AGE Project No. 95-0121 Environmental Page 3 of 5 Following installation, each well will be developed to maximize water flow and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing. The top of each newly installed well casing (well head) will be surveyed to determine its elevation relative to North American Vertical Datum 88. An as built diagram of the proposed construction of the proposed wells has been included as Figure 3. 2.4. GROUNDWATER SAMPLING AND ANALYSIS Following the installation of the new monitoring wells, groundwater monitoring and sampling activities will be conducted at the wells on a quarterly basis for a minimum of one year (four sampling events); monitoring activities will include recording depth to groundwater measurements and collection of groundwater samples for laboratory analysis of the following: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) by EPA Method 801513; • Benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8260B; • Ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), tert-butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), methyl tert-buyl ether (MTBE) and Naphthalene by EPA Method 8260B; • Total lead by EPA Method 200.8. Ground water monitoring and sampling procedures are included with Appendix B. 2.5. PREPARATION OF REPORT OF FINDINGS A report documenting the findings during well installations, development and survey will be prepared following performance of field work and receipt of all applicable data. Additionally, quarterly reports will be prepared following each groundwater monitoring event. Each report will include a description of work performed and the results of the groundwater sampling and analysis. Conclusions and recommendations will also be included, if applicable for each report. All reports will be in a format acceptable to the RWQCB, and will be reviewed and signed by a California Professional Geologist. 3.0. FIELD PROCEDURES All field procedures will be overseen by an AGE representative under the supervision of a California Professional Geologist. Procedures for boring advancement, boring logs, well installation, well development and well sampling are described below.