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i NORCALCOONSULTANTS INC • February 2, 2001 Christopher Palmer Wright Environmental Services, Inc 67 E 10" Street Tracy, CA 95376 Dear Mr Palmer- This almerThis letter presents the finaings of a geophysical Investigation performed by NORCAL Geophysical Consultants, Inc atthe property formerly occupied by Ed's Muffler, 595 E 111"Street, Tracy, California The survey was conducted for Wright Environmental Services on January 16, 2001 by Geophysicist, Dan ❑ Jores Christopher Palmer provided site orientation and logistical _-support SITE DESCRIPTION AND PURPOSE The site was previously occupied by Ed's Muffler shop, and is currently being used as a used car sales lot as well as access to, and parking for, a trailer park The limits of our investigation area as designated by Wright Environmental Services, and taking into account instrumental access, are shown on Plate 1 This area extends north/south from the northern edge of the overhead • canopy in front of Mr Ed's Muffler building to aporoximately 75 feet north of the former welding building It extends east/west from the eastern property fences to approximately 5 feet east of the trailers in the north portion and to the sidewalk surrounding the former muffler shop in the southern portion It also includes some portions of the orooerty surrounc ing the southernmost trailer and areas behind the muffler building Notable site features in the vicinity of the survey area include the railroad located east of the property trending north/south, multiple vent pipes along the north wail of the muffler building, a chain carricade toward the southern end of the survey area, a carport in the northeast comer of the survey area, and several monitoring wells The site was cleared of vehicles upon our arrival at the site, except for those areas noted on Plate 1 Information proviaed by Wright Envirormental Services indicates that a large irrigation pipeline trends north/south through the survey area, possioly undercutting the western half of the welding building Additional information providea by Wright Environmental Services indicates that multiple underground storage tanks were removed from the property However, there is reason to believe that additional UST's may still exist Tnerefore, the purpose of the survey is to acquire subsurface information that will aid in assessing whether additional UST's may still be present, as well as any other possible subsurface features that may represent potential contaminant sources GEOPHYSICAL APPROACH Based on site access and site conditions, we performed the investigation using two different geophysical methods electromagnetic line locating (EMLL) and grouna penetrating radar(GPR) • The EMLL method consists of using a specializes metal detector and a pipe and cable locator to locate near surface buried metallic objects such as underground utilities and USTs The ground penetrating radar method is used to locate born metallic and non-metallic boned objects Detailed descriptions of the geophysical methodology and instrumentation can be found in Appendix A 1350 INDUSTRIAL AVENUE SUITE A•PETALUMA CA 94952 -TELEPHONE (707) 763-1312 -FAX {707) 762-5587 SOUTHERN CALIFORNIA TELEPHONE (774) 708-7727-FAX (714) 708-7720