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~, ~~ ~~ _ <br />~ <br />~ ~- ~ c.,~ Y ;~-- -~ v ~ - :..u~t <br />y,- ~~.~,u~..~:~; -f-`~~ ~~ tv ~ <br />> <br />~i~c~.~---~ , <br />~~~--~ C /~ <br />7 <br />August 25, 1997 <br />Bruce Scherzinger <br />DEQ - Western Region <br />750 Front Street, Suite 120 <br />Salem, Oregon 97310 <br />__~____-____.~. .~~_. ~.______ __ _, <br />~. __ . .__.1\ <br />RE: ubsurf~ce Remedial Work Plan ~ <br />Courthouse Square, Salem, Oregon ' <br />Dear Mr. Scherzinger: <br />c~ c ~ t~....~~., ~..:.~`~- <br />~ -s .l c~. ~~ ~ti._., `. ~ - <br />~ <br />~ <br />On behalf of our client, Marion County, Century West Engineering is submitting this work plan <br />to conduct remedial activities at the above-referenced site prior to and during construction <br />excavation. Both known and suspected areas of contamination have been identified on the <br />project site, therefore this work plan describes an approach to investigating suspect areas and <br />then remediating areas to meet closure criteria. Century West plans to provide you with progress <br />updates during remedial activities to confirm our approach in regards to achieving site closure <br />from the Oregon Department of Environmental Quality (DEQ). <br />LOCATION <br />The subject property is the entire block bounded by Court, Church, Chemeketa, and High Streets <br />in Salem, Oregon (Figure 1). Building demolition on this block is nearing completion, and <br />construction of a new office building is planned with a one-level subsurface parking garage <br />covering the entire block. The construction excavation depth will be approximately 12 feet <br />below ground surface (bgs). Groundwater dewatering is not planned during or post-construction. <br />PRE-CONSTRUCTION REMEDIAL APPROACH <br />The areas of known or suspected underground storage tanks (USTs) and/or subsurface <br />contamination (hereafter referred to as "areas of interest") on the subject property are based on <br />Century West's Subsurface Investigation Report (March 14, 1997), which included a summary of <br />historical property use records. Petroleum hydrocarbons were identified as the contaminants of <br />concern, with DEQ Matrix Level 2 soil cleanup standards of 80 milligram per kilogram (mg/kg) <br />gasoline-range total petroleum hydrocarbons (TPH) and 500 mg/kg diesel-range TPH used to <br />delineate the extent of contamination. <br />