Laserfiche WebLink
a <br /> ASSOCIATES I NC <br /> (Figure 2) Groundwater flows east-northeast, away from the slough, with a gradient of approximately <br /> 0 07 feet/foot or 370 feet per mile <br /> No petroleum hydrocarbon constituents were detected in the groundwater samples collected from <br /> wells MW1, MW2, and MW4R BTEX was not contained in any of the groundwater samples Wells <br /> MW5 and MW6 contained TPHd at concentrations of 97 parts per billion (ppb) and 120 ppb, <br /> respectively The samples from wells MW3, MW5, and MW6 contained MTBE at concentrations of <br /> 9 0 ppb, 2,100 ppb, and 60 ppb, respectively Analytical results are summarized in Table 2 <br /> Laboratory reports with chain-of-custody documents are included in Attachment 2 <br /> RECONEWENDATIONS <br /> Due to the detectable concentrations of MTBE in the groundwater sample from wells MW3, MW5, <br /> and MW6, ATC recommends continued monitoring and sampling of all site wells (MW 1 through <br /> MW6)for TPHg, TPHd,BTEX, and MTBE by EPA Methods 8015/8020 <br /> If you have any questions or comments regarding this project, please contact our office at (209) 579- <br /> 2221 <br /> Respectfully subrrutted, <br /> ATC Associates Inc <br /> PJ— <br /> Drew Van Allen <br /> Staff scientist �oIRROVE.SSIp <br /> JEANNL F� <br /> Ho SE1l <br /> Jeanne Homsey N4.C0 <br /> CA Registered Civil Engineer No C47410 P. Zr <br /> Attachments J'1,9Jf CIVIL,�o���2 <br /> Q, SAL <br /> cc CRWQCB <br /> Jay Mills, Westrec Marinas <br /> W 1625141quWlyl3cIr-1998 dw 2 <br />