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1260 Graphics Drive <br /> r Modesto, California <br /> 95351 <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> VATC PAYMENT <br /> A S S O C I A T E S I N C . PF:(� invPn <br /> SAN JOAQUIN COUNTY <br /> PUBLIC TH <br /> March 30, 1998 ENVIRONMENTALHEATHHICES DIVSION <br /> Mr. Steve Sasson <br /> San Joaquin County PHS/EHD <br /> 304 E. Weber Street, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject: Work Plan for Site Investigation and Remediation at the D'Arcy Parkway Road <br /> Extension Site, Lathrop, California <br /> Dear Mr. Sasson: <br /> ATC Associates Inc. has prepared this workplan, on behalf of AEW Capital Management for <br /> performing a subsurface investigation at the subject site. The purpose of the site investigation is <br /> to determine the vertical and horizontal extent of impacted soil and groundwater in the vicinity of <br /> a surface spill. The source of the surface spill and date of occurrence are unknown. The scope of <br /> work will include obtaining permits, advancing a minimum of four soil borings, soil and <br /> groundwater sampling, laboratory analysis of selected soil and groundwater samples, and <br /> preparing a summary report. In addition, to expedite remediation of the site, ATC proposes <br /> excavation of impacted soil and removal of impacted groundwater. The scope of work is <br /> described in detail in the following paragraphs. <br /> SITE LOCATION <br /> The site is located on the end of D'Arcy Parkway in Lathrop, California, as shown on Figure 1. <br /> The location is an agricultural, commercial and industrial area and the site is within the roadway <br /> extension at approximately the 400 or 500 block of D'Arcy Parkway. <br /> BACKGROUND <br /> In March 1998, during construction activities associated with the extension of D'Arcy Parkway, a <br /> suspected surface spill was discovered and construction activities were suspended. A soil sample <br /> was collected which indicated the presence of total petroleum hydrocarbons as diesel (TPHd). <br /> The site has been agricultural until the recent ongoing development began. There is no evidence <br /> that the diesel fuel was released from an underground storage tank. It is assumed that the source <br /> of the diesel fuel is related in some way to the fueling of construction equipment during grading. <br /> On March 25, 1998, ATC Associates was retained to investigate the extent of the suspected <br /> surface spill. Five test pits were excavated the vicinity of the suspected spill (Figure 2). No <br /> evidence of petroleum hydrocarbons was noted in the first four test pits to depths of <br /> w:\822544orkplan.doc 1 <br />