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� F _ L Page 4 i A West Lauffer Road Property February 16,2006 _ Job No. 2836-001 Groundwater Groundwater in the site vicinity occurs at very shallow depths and is largely dependent on the stage of the adjacent Mokelumne River, nearby Sacramento River, general tidal fluctuations, and nearby agricultural pumping activities. Communications with a San Joaquin County Public Water System .. representative, Ms. Adrian Ellsaesser, indicate that shallow groundwater is encountered between depths of about one to eight feet and exhibits a general northwesterly flow direction. Ms. Ellsaesser also stated that most domestic water wells in this area are shallow, extending to depths of only about 31 50 feet. PREVIOUS ENVIRONMENTAL INVESTIGATION Communications with property owner representative,Mr.Bruce Towne, indicate that he is not aware of any previous environmental investigations for the subject property. SITE RECONNAISSANCE ' PRESENT SITE USE ' General /The approximate 323-acre subject property is situated in a historically agricultural area of Thornton, San o Joaquin County, California. The subject property is identified by the San Joaquin County Assessor's Office as parcel numbers (APNs) 001-030-03 and -04 and is addressed as 13045 and 13500 West Lauffer Road, respectively. The subject site is generally surrounded by vacant farmland. - The centerline of the Mokelumne River levee defines the property's westerly boundary; vacant farmland was observed to the west beyond this river. A Royal Energy Company natural gas well (McCormick _ .. 41-36) is located immediately southerly of the property. For a better understanding of the subject site (W location and layout, please refer to Plates 1 through 6; various vicinity maps also are presented in the Appendix. f On January 27, 2006 we conducted a reconnaissance of the subject property accompanied by a property owner representative, Mr. Tim Driscoll. The property is accessed via West Lauffer Road, which terminates at the on-site southwesterly residence. The subject site currently supports two it occupied rural farm residences and several associated outbuildings, a former transmission building, and a portion of West Lauffer Road. The remainder of the property supports vineyards, except for approximately 40-acres on the far northwesterly portion of the site, whicFsupports a pear orchard. Several irrigation ditches were apparent on the property and along the southern margin of West Lauffer Road. We understand that the grape vines were recently removed from the far southeasterly _.. portion of the property; our observations of this southeasterly area revealed large piles of uprooted grape vines and recently tilled ground surfaces. A former support building for a UPN Channel 31 transmission tower is situated on the southwest-central portion of the subject property; we understand this structure is currently used by the residential tenants to store paints and general building supplies. The northwestern rural farm residential area includes a modular home, garage, and three silos converted for domestic and farming supply storage purposes. An additional unoccupied wood-framed home was also apparent within the northwestern residential area; we understand this house is scheduled to be transported to an off-site location.