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i ' 31 August 2000 AGE Project No 96-0232 ' Page 18 of 25 I submit drilling permits by 15 September 2000, AGE anticipates a 14-day turnaround time for PHS- EHD approval of the permit Prior to digging activities, each proposed digging location will be clearly marked at least 48-hours in advance and a utility clearance obtained through Underground Service Alert Installation of a 20- by 30-foot chain-link gated enclosure will be located in the southwest section of the site to secure the ground water treatment system, AGE anticipates completion of the gated enclosure by 01 October 2000 5 2 INSTALLATION OF REMEDIATION WELLS IA ground water extraction system in conjunction with on-site treatment is proposed to reduce petroleum hydrocarbon mass and MTBE mass within the "core" impacted area at the site In order to maximize the efficiency of the clean-up efforts, a 24-hour operation of the system is planned Typical ground water extraction treatment rate is expected to be less than laboratory detection levels I of dissolved petroleum hydrocarbons and MTBE throughout the entire cleanup duration The pilot test performed at Former Texaco/Big Bear Chevron Service Station (Section 4 1 1) utilizing the GAC/SunSolve series and the documents provided by Pure Effect Incorporated (Appendix J) I� demonstrate the efficiency of the treatment system to remove the above referenced dissolved substances Seven additional ground water extraction wells will be installed at the site to supplement remediation efforts of the core petroleum hydrocarbon-impacted area at the site Proposed ground water extraction well locations are illustrated in Figure 9 IBased on an estimated radius of influence of 20 feet for each extraction well in the First Aquifer Zone (Section 3 2 ), AGE proposes installation of ground water extraction wells in the following Ilocations • approximately 10 to 20 feet west of P 18 in landscaped area, , • approximately 10 to 20 feet north of MW-9 in landscaped area, • approximately 5 to 15 feet southeast of P25 near the west section of the UST pit area, Ia approximately 10 to 20 feet east of P 12 near the southeast corner of the UST pit area • approximately 10 to 20 feet north of P24 near the northeast section of the UST pit area • approximately 10 to 20 feet north of P33 near the northeast fuel dispenser area • approximately 5 to 15 feet northeast of P6 near the southeast fuel dispenser area Advanced GeoEnvironmental,Inc I