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�..i *now Mr Michael J. Infurna Jr. P.G., S.R.E.H.S. August 2, 2006 Page 2 French Camp - General Construction Yard, 401 French Camp Road, French Camp, California. The following conclusions and recommendations were presented: • Total petroleum hydrocarbons as diesel (TPHd) (11 to 33 mg/kg) and TPN as motor oil (TPHmo) (50 to 110 mg/kg) were present in the four soil samples collected 2 feet below ground surface (bgs) where PG&E had formerly used the con-vault to store and dispense diesel and gasoline fuels to fleet vehicles. • Soluble fractions of TPHd and TPHmo (in the sample with the highest concentrations) were not detected at concentrations equal to or greater than the method reporting limits, indicating that these hydrocarbons are unlikely to leach into the subsurface and impact the groundwater. • The soil profile included fine-grained soils (silts and clays) and a competent hard pan approximately 3.5 feet below ground surface (bgs) that appeared to be continuous between borings. This hardpan reduces the leaching potential of the hydrocarbons into groundwater. • Based on the low-permeability soil profile and the lack of soluble TPHd and TPHmo fractions, TPHd and TPHmo at relatively low concentrations in the soil samples Y� collected where PG&E had formerly used the convault do not pose a threat to groundwater at the Site. During the above-cited investigation, additional information suggested that the former steel ASTs (replaced by the con-vault) were located at the heavy equipment storage shed. The purpose of this second limited Phase If investigation is to evaluate potential petroleum hydrocarbon impacts at the heavy equipment storage shed. During this investigation, PG&E requested that SECOR collect a sample from the water well adjacent to the heavy equipment storage shed (see Figures 2 and 3). As noted above, SJCEHD approved SECOR's April 26, 2006 work plan and issued boring permit SR # 0046695 on May 16, 2006. During coordination for the site visit, SECOR was informed that the French Camp site was no longer active and former PG&E French Camp staff were not present at the site. FIELD INVESTIGATION As required by the SJCEHD and compliant with Occupational Health and Safety Administration (OSHA) guidelines (29 CFR 1910.120) and with California Occupational Health and Safety Administration (Cal-OSHA) guidelines (CCR Title 8, Section 5192), SECOR prepared a site-specific HASP. SECOR completed the HASP with appropriate field personnel and site-specific safety information. Field staff reviewed the HASP before beginning field operations at the Site and had a copy of the HASP with them as they did the V I:\PG&E\2nd Pz II\repornFinal PGE French Camp 2nd Phase ll.doc V