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Phase I Environmental Site Assessment Project b:99-1261 Proposed AutoZone Site.Manteca.California Pebruarc 19. 1999 Page 5 The topography of subject site is generally flat with a slight depression around a surface drain in the center of the property (Anthony-Taylor Survey, October 1997). The property is at the same approximate elevation as surrounding properties, approximately 33 feet above mean sea level. Regionally, the topography of the Manteca area slopes to the west (USGS Topographic Quadrangle, 1952). Hydrogeology The subject site lies within the San Joaquin Valley groundwater basin in the central valley. The depth to groundwater beneath the site and the groundwater gradient were not directly assessed as part of this investigation. However, a review of site specific documentation supplied by the property owner, indicated that the depth to the first encountered groundwater beneath the site is approximately thirteen(13) feet below ground surface (bgs) and that the groundwater flow direction is towards the north(ATC Associates, 1998). The hydraulic gradient was also reported at 0.02 feet per year. Site Improvements /Structures Improvements to the subject site at the time of our site visit, February 8, 1999, included a planter box enclosed by a concrete curb. asphaltic concrete pavement (in poor condition). two (2) area drains, several sewer clean outs. and several small concrete pads (See Figure Ic, Site Map). The remnants of several fence posts were also noted on the property- small metal cylinders in the ground cut off at the ground surface. Environmental Liens /Special Knowledge No environmental liens regarding onsite environmental concerns were indicated during our research and interviews. Special knowledge into the past use of the subject site and the adjacent site was obtained through Mr. Ronald Michelson representing the current property owner, Value Reclamation Corporation. Mr. Michelson presented environmental records associated with the subject site detailing an unauthorized release of petroleum hydrocarbons on the portion of the parcel occupied by Don's Mobile Glass. These records were reviewed by a representative of Anthony Taylor Consultants, Mr. Michael J. Barnett. The records supplied by Mr. Michelson indicated that the site was once occupied by Diamond Lumber, a retail lumber yard. Associated with the lumber yard was an underground storage tank. During a Phase II - Environmental Assessment on the site in 1991 it was discovered that the soil and groundwater