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r <br /> t <br /> r <br /> SEGO „ <br /> o, 1771rlllrll7(�ll�rlllI(-wl)olal(rl <br /> October 2, 199$ <br /> fi <br /> c�+kwk <br /> Ms Christine Holm ��� <br /> California RWQCB Centr l Valley Region <br /> 3443 Routier Road, Suite A ,X <br /> Sacramento, CA 95827-3098 <br /> Re Quarterly Monitoring Report- Third Quarter 1998 <br /> Former Texaco Service Station <br /> f i„eye <br /> �1� y <br /> 440 Charter Way <br /> Stockton, California4" ' <br /> Dear Ms Holm <br /> On behalf of Equilon Enterprises LLC, this letter transmits a Quarterly Status Report summarizings <br /> the current and past activities at the site and results of third quarter 1998 groundwater monitoring rh } <br /> �ME, <br /> and sampling conducted at the referenced site on August 11, 1998 } , <br /> E <br /> SITE HISTORY _, <br /> The site is an operating Texaco Service Station, in a mixed residential and commercial area of � <br /> southern Stockton The land surface slopes gently towards the San Joaquin River, which is located E.Ks <br /> scj <br /> approximately 1 5 miles south of the site <br /> Background <br /> 1 <br /> In October 1988, hydrocarbon-impacted soil was observed at the site after two pump islands were ' <br /> removed in preparation for new construction Soil beneath the eastern pump island was excavated <br /> to a depth of 15 feet below ground surface (bgs) Soil samples collected from the bottom of this PI" <br /> t <br /> excavation contained detectable petroleum hydrocarbons (BTEX, TPHg) <br /> §t <br /> Between May 1989 and April 1992, twenty soil borings were drilled, eleven groundwater <br /> monitoring wells were installed (MW-I through MW-1 1), and four nested soil vapor extraction <br /> (SVE) wells were installed (VE-1 through VE-4) Analytical data indicated that soil samplesa� <br /> collected from soil borings SB-1, SB-4, MW-2 through MW-5, and MW-7 through MW-1 1 did <br /> not contain concentrations of TPHg and BTEX above the practical quantization levels (PQL) Soil <br /> samples from borings SB-2, SB-3, SB-3, MW-1, and MW-6 contained detectable concentrations <br /> of TPHg and benzene Soil samples were not analyzed from borings VEW-1 through VEW-4R€ i <br /> because these borings were drilled adjacent to borings with previous analytical data <br /> yF�{ <br /> wad <br /> 9912167% t(oN11(lik1)?v(' Sting100 Sricrrrniwlo C4055?77O16) ;hf 155O(916) 1 IF trtrr ccnichin �i �' <br /> F x , <br />