Laserfiche WebLink
GROUNDWORKS <br /> ENVIRONMENTAL,INC. <br /> June 5, 1998 <br /> Project AE5701 <br /> Mr. Dave Henry <br /> Hazard Management Consulting, Inc. <br /> 1528 Via Tulipan <br /> San Clemente, California 92673 <br /> Re: Letter report - dewatering system discharge sampling and field observations at <br /> Crossroads Center in Lathrop, California <br /> Dear Dave, <br /> Groundworks Environmental, Inc. (Groundworks) has prepared this letter report, at <br /> your request, to document services performed by Groundworks at the Crossroads <br /> Center in Lathrop, California. Groundworks' services consisted largely of dewatering <br /> system discharge sampling and field observations related to the excavation of soils for <br /> subsurface utility placement just beyond the present eastern terminus of D'Arcy <br /> Parkway (site). <br /> Background <br /> It is Groundworks' understanding that diesel fuel-contaminated soil and groundwater <br /> had been encountered on site, and that the diesel fuel was likely related to the fueling <br /> and/or operation of construction-related equipment on site. <br /> Groundworks understands that approximately 200 cubic yards of impacted soil was <br /> excavated, and over 9,500 gallons of water had been removed from the excavation by <br /> vacuum truck, at the direction of ATC Associates Inc. (ATC Associates, Inc., <br /> Summary Report for Subsurface Investigation, Interim Remediation, and Corrective <br /> Action Plan at D'Arcy Parkway -Road Extension, Lathrop, California, dated April 22, <br /> 1998). <br /> ATC reported that "the majority of petroleum hydrocarbons present in the soil beneath <br /> the site have been removed," citing the results of the confirmation sampling performed <br /> following their over-excavation activities (ATC, 1998). ATC reported "Soil samples <br /> from the excavation sidewalls at 14 feet bgs and from the excavation bottom at 17 feet <br /> bgs contained nondetectable to low concentrations of TPHd (4.0 ppm) and xylenes <br /> (0.058 ppm)." <br /> Groundworks Environmental,Inc. • 1900 Lafayette Street,Suite 209 • Santa Clara,CA 95050-3946 <br /> Telephone (408)327-0110 • Fax (408)327-0119 <br /> printed on recycled paper <br />