Laserfiche WebLink
CVYATC <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www.atc enviro.com <br /> 209.579.2221 <br /> ASSOCIATES I NC . <br /> Fax 209.579.2225 <br /> May 7, 2003 - <br /> 54.14981.0001 <br /> JUL 1 0 2003 <br /> Ms. Margaret Lagorio ENVIRONMENT HEALTH <br /> San Joaquin County, Environmental Health Division PERMIT;SERVICES <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Letter Workplan for Interim Remediation at N&S Irrigation, 215 West Main <br /> Street, Ripon, California <br /> Dear Ms. Lagorio: <br /> ATC Associates Inc. has prepared this letter workplan on behalf of N&S Irrigation for <br /> performing interim remediation activities at the subject site. The objective of the interim <br /> remedial action is to attempt to lower the concentrations of petroleum hydrocarbon constituents <br /> to acceptable levels over time. <br /> The scope of work has been requested by San Joaquin County Environmental Health Division <br /> (EHD) in a letter dated January 24, 2003 and is described in detail in the following paragraphs. <br /> BACKGROUND <br /> In March 1990, one 1,500-gallon unleaded gasoline underground storage tank (UST), one <br /> unleaded gasoline UST of unknown size, and all associated piping and dispensing equipment <br /> were removed and transported off-site. Laboratory analysis of soil samples collected from <br /> beneath the former 1,500-gallon UST location indicated the presence of detectable <br /> concentrations of total petroleum hydrocarbons. Discoloration of the soil and a petroleum <br /> hydrocarbon odor were noted in the field. After the tanks were removed, the areas of the former <br /> tanks were backfilled. <br /> On November 14, 1997, a geologist from ATC Associates supervised the advancement of two <br /> soil borings to 30 feet below ground surface (bgs). Analytical results of soil samples indicated <br /> the presence of petroleum hydrocarbons. One groundwater sample was collected from each <br /> boring at the depth groundwater was first encountered, approximately 30 feet bgs. Groundwater <br /> samples indicated the presence of petroleum hydrocarbons. Results are summarized in ATC's <br /> Summary Report of Subsurface Investigation, dated January 14, 1998. <br /> On July 13, 1998, a geologist from ATC Associates supervised the advancement of four soil <br /> borings to 26 to 31 feet bgs. Analytical results of soil samples indicated the presence of <br /> petroleum hydrocarbons. One groundwater sample was collected from each boring at the depth <br /> groundwater was first encountered. Groundwater samples indicated the presence of petroleum <br /> hydrocarbons. Results are summarized in ATC's Summary Report of Additional Subsurface <br /> Investigation, dated September 9, 1998. <br /> w:\wordpro\14981\FLepor"Vi 1�,,MTECHNICAL AVD MATERIALS PROFESSIONALS <br />