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HomeMy WebLinkAbout1056; Holiday Park Comfort Station; Holiday Park Comfort Station; 1979-01-083467 Kurtz Street ^^ San Diego. California 92110 714-224-2911 Teiex697-84i January 8, 1979 Project No. 58409L-EC01 City of Carlsbad Engineering Department 1200 Elm Avenue Carlsbad, California 92008 Attention: Mr. Ross Morrison PRELIMINARY SITE AND SOIL EVALUATION HOLIDAY PARK COMFORT STATION CARLSBAD, CALIFORNIA Gentlemen: In accordance with your request, we have made a preliminary evaluation of the soil conditions at the site of the subject comfort station for the city park located between Pio Pico Drive and Eureka Place, and between Pine Avenue and Crestnut Avenue, in Carlsbad, California. The subject site was visited on December 27, 1978, at which time the location of the proposed comfort station was examined, several probes were made in the general area, and examination was made of a similar comfort station constructed on the west side of the subject park. You indicated at the time of our site visit that no previous soil investigation had been done for the subject project, and the architectural plans provided to us at this time were based upon code designs. The results of our site visit and discussion of the con- ditions of the general area indicate that the site for the proposed comfort station appears to be underlain by residual soils formed on the underlying terrace materials. Results of our probes suggested that the residual soils are a mini- mum of approximately 3 feet deep, and as indicated during our discussion, may extend to depths in excess of 5 feet. It did appear during our site visit that the area where the comfort station is to be constructed is relatively uniform with the exception of the southern end, which exhibited pea gravel at the surface; this suggests some type of back- filling could have occurred in this area. It did appear that the remainder of the site has very similar soil con- ditions and our probes also suggested this. Our review of the architectural plans prepared by Larry E. Yeakel, and dated May 19, 1978, indicates that 16-inch wide footings are to be extended 12 inches below rough grade, contain Consulting Engineers, Geologists and Environmental Scientists Offices in Other Principal Cities City of Carlsba^) January 8, 1979^ Project No. 58409L-EC01 Page 2 Woodward-Clyde Consultants No. 4 bars top and bottom, and the 4-inch thick slab is to contain 10/10 x 6x6 wire mesh. The following recommendations are based upon our site visit, a discussion with you concerning the subject site, construc- tion of the other comfort station within the park, and review of the architect's plans. We recommend that the footing excavations be inspected by personnel from our office to observe the soil conditions present at the bottom of the footings. It is our opinion that, if soils exposed in the footing excavations are uniform across the entire area of the build- ing and are not in a loose or porous condition, very little detrimental settlement should occur beneath the subject structure due to its light weight. If it is determined during the inspection of the footings that conditions are variable across the site or that they vary from that exposed at the ground surface, it may be required that footings be deepened or that the material at the bottom of the footings be compacted to a minimum of 90 percent of maximum density as determined by ASTM D1557 prior to pouring footings. It is suggested that the footing inspections be made immediately after excavation and clean- ing and prior to placing any forms or steel. If there are any questions, please call Mr. Daryl Streiff, the project geologist assigned to this study, or the under- signed. Very truly yours, WOODWARD-CLYDE CONSULTANTS ^M4K6? rJames E. Cavallin R.E. 17553 JEC/DS/dm (4)